Friday, December 28, 2018

UVULA OF NORTH AMERICA

Bellworts


There are only five species of Uvularia, all endemic to the temperate forests of eastern North America: Uvularia floridana,  U. grandifloraU. perfoliataU. puberula, and U. sessilifolia (See Table 1). All five species are considered spring ephemerals and usually bloom from late March thru early May. Most wildflower enthusiasts easily recognize the genus Uvularia and its’ five species but, the genus is not free of taxonomic problems. Over the years the genus has been placed in various families within the order Liliales includingLiliaceae, Convallariaceae, Uvulariaceae, and Melanthiaceae.Currently,  Weakley’s Flora of the Southeastern United States places the genus in the family Colchicaceae.2

The genus is characterized by herbaceous perennials that grow from rhizomes. The main plant body usually consists of a single or once branched stems. The plants may be 45–60 cm in height or less. Leaves alternate and, depending upon the species, may be sessile or perfoliate. The perfoliate species have entire margins while the non-perfoliate species have minutely serrated margins, often a hand-lens is needed to see the latter trait. The flowers consist of six yellow tepals that are narrowly campanulate and pendulous, hence the origin of common names such as Bellwort and Merrybells (See Figure 1). The androecium consists of six stamen that may be weakly to strongly connate at the base. The gynoecium consists of a superior tri-locular ovary and one style divided into three stigmas. Fruits are three-lobed capsules, roughly triangular to globose in shape (See Figure 2).


Figure 1: Uvularia grandiflora - Large Flowered Bellwort
Note the pendulous flower composed of six yellow tepals.


Figure 2: Fruit of Large-flowered Bellwort - U. grandiflora 
(Photo by Krzysztof Ziarnek, Kenraiz Wikimedia Commons)

TABLE 1: Comparison of Species Taxonomic Treatment 
Common Name(s)
Radford & Bell 3
(1968)
Flora of North America 4 (2003)
Weakley (2015)
Florida
Bellwort

U. floridana Chapman
U. floridanaChapman

U. floridana Chapman
Large-Flowered Bellwort
U. grandiflora J.E. Smith
U. grandiflora J.E. Smith
U. grandiflora J.E. Smith
Perfoliate Bellwort

U. perfoliata L.

U. perfoliata L.

U. perfoliata L.
Carolina or Appalachian Bellwort
U. pudica (Walter) Fernald
U. puberula Michaux
U. puberula Michaux
Wild-Oats
U. sessilifolia
L.
U. sessilifolia L.

U. sessilifolia L.

SPECIES WITH PERFOLIATE LEAVES


The two Uvularia species with perfoliate leaves, U. grandiflora, and U. perfoliata, share the following traits: rounded stems, entire leaf margins, and obovoid-truncate capsules.

Large-flowered Bellwort, Uvularia grandiflora, and Perfoliate Bellwort, U. perfoliata, are easy to distinguish from each other. Uvularia grandiflora is the largest and most showy of the five bellwort species (See Figures 1, 3, 4, 5). Large-flowered Bellwort is commonly found in the N.C. mountain and piedmont regions where it blooms April thru May in rich mesic coves. The plant has multiple branches with 1-3 flowers per branch and each flower is preceded by a large, foliaceous, and perfoliate bract (See Figure 3, 4). The deep yellow flowers are 2.5-5 cm long, pendulous, with characteristic twisting tepals that are glabrous on the inner tepal surface (See Figures 1, 3, 4). The bright green leaves are alternating, perfoliate, and with pubescence along the veins on the abaxial side. Like the tepals the leaves are twisted and somewhat pendulous, thus giving the over-all plant a slightly wilted appearance (See Figure 3). The pendulous leaves sometimes hide the flowers making them easy to overlook.


Figure 3: Large-flowered Bellwort - Uvularia grandiflora
Note the overall wilted appearance of the plant and bright
yellow flowers composed of six twisted tepals.



Figure 4: Large-flowered Bellwort - U. grandiflora
Note the large, foliaceous, and perfoliate bract above the flower.

Figure 5: Large-flowered Bellwort - U. grandiflora
(USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, 
Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 519.)


Uvularia perfoliata, or Perfoliate Bellwort, may initially be confused with U. grandiflora, due to the perfoliate leaves but, a closer look will quickly settle any confusion. Perfoliate Bellwort is commonly found in the mountains and piedmont of N.C. and uncommonly in the coastal counties. It can be found in moist to dry hardwood forests and it is not unusual to find Large-flowered Bellwort and Perfoliate Bellwort growing side by side. Perfoliate Bellwort has alternate, perfoliate leaves that are glabrous and glaucous on the abaxial side. Similar to Uvularia grandiflora, the flowers are fairly large, approximately 2-3.5 cm in length, and are preceded by a large foliaceous perfoliate bract (see Figures 6, 7, 8, 10). However, unlike U. grandiflora, the tepals of U. perfoliata are very pale yellow to cream in color, not twisted, and they are distinctively papillose on the inner surface (See Figures 6, 7, 8, 9). Additionally, Perfoliate Bellwort only has one flower per branch as opposed to 1-3 for Large-flowered Bellwort. 


Figure 6: Perfoliate Bellwort - U. perfoliata
Note the lemon yellow, non-twisted tepals,
and large, foliaceous, perfoliate bract.



Figure 7: Perfoliate Bellwort - U. perfoliata
Note the large, foliaceous,  perfoliate bract preceding the flower.




Figure 8: Perfoliate Bellwort - U. perfoliata
Note the inner tepal surfaces are papillose unlike the glabrous
inner surface of Large-flowered Bellwort flowers.


Figure 9: Perfoliate Bellwort - U. perfoliataThis is a better look at the papillose tepals characteristic of Perfoliate Bellwort.
 (Photo taken by Fritz Flohr Reynolds - Wikimedia Commons)



Figure 10: Perfoliate Bellwort - U. perfoliata
(USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 518.)

TABLE 2: Summary of Traits for UvulariaSpecies with Perfoliate Leaves 
(major differences are in bold-face)
Traits
Uvularia grandiflora 
Large-Flowered Bellwort
Uvularia perfoliate
Perfoliate Bellwort
Distribution
Common in NC mountains and piedmont
Common in NC mountains and piedmont and uncommon on Coast
Habitat

Rich mesic coves and mesic forests
Rich mesic coves, moist -dry hardwood forests
Bloom Time
April – May
April - May


Flowers
Dark yellow, twisted tepalsno glands on inner tepal surfaces, 
Preceded by a large foliaceous bract,


Pale Yellow -Cream colored petals, not twisted and with distinct papillose glands on inner tepal surfaces,
Preceded by a large foliaceous bract
Foliage
Bright green, pubescence along abaxial veins
Leaves glabrous and glaucous underneath
Fruits
Triangular capsule
Triangular capsule



















SPECIES WITH SESSILE LEAVES


The three Uvularia species U. floridanaU. puberula, and U. sessilifolia share the following traits: sessile leaves with minutely serrated margins, angular stems, and ellipsoid capsules that are distinctly winged. See table three for a summary and comparison of the sessile-leaved species.

Uvularia floridana, or Florida Bellwort, is the only Uvularia species not found in N.C. It can be found growing in mesic to wet, low elevation, forested bottomlands and alluvial floodplains in Alabama, Georgia, Florida, Mississippi, and South Carolina. It is rare and endangered across its’ range. The plants are approximately 20-40 cm in height with alternate, sessile, dull green leaves that are fleshy with a thick cuticle. The plants are unbranched to once branched with one flower per branch. The pale white-yellowish flowers are 2-3 cm in length and are proceeded by a foliaceous bract. The tepals have long pointed (acuminate) tips. Florida Bellwort may be confused with Wild Oats, U. sessilifolia, which grows in similar habitats. Besides the fact that U. sessilifolia has darker colored tepals there are two other major characteristics that can help distinguish between Florida Bellwort and Wild Oats. First, U. sessilifolia does not have bracts subtending the flowers as U. floridana does and secondly, the tepals of U. sessilifolia are rounded to blunt tipped and not long and pointed as in U. floridana.

Uvularia puberula or Appalachian Bellwort is common in the N.C. mountains and piedmont areas but uncommon in the coastal region. It inhabits moist to dry acidic forests.  The plants often grow in tight clumps. The alternate, sessile, leaves are dark green, lustrous (on both sides), and thick or ‘leathery” in texture. The angular stems have lines of hairs (pubescence) running along the ridges hence the specific epithet “puberula” (See Figure 11, 12). Each branch will have one to three pale yellow flowers that range from 2-2.5 cm in length (See Figure 11, 12).

This species is often hard to distinguish from U. sessilifolia. Part of this confusion may come from some natural variation of traits within U. puberula. Some botanists support two variations of U. puberula: a mountain variety, Uvularia puberula var. puberula, with broader, clasping leaves and stems, with distinct lines of pubescence, and a piedmont variety, Uvularia puberula var. nitida,  with glabrous stems and narrow leaves with cuneate bases. 5,6 So, the latter variation, var. nitida, with its’ glabrous stems will look very similar to U. sessilifolia. It is interesting to note that Weakly and many other taxonomists do not recognize these variations.2,6 Either way, a simple solution is to look at the underside of the leaves, remember, U. sessilifolia leaves are glaucous underneath while U. puberula are dark green and lustrous. You can also compare the stigmas, U. puberula has long stigma lobes (4-6 mm) (See Figure 13) while U. sessilifolia has very short stigma lobes (1-2 mm).
  

Figure 11: Appalachian Bellwort - U. puberula
Note the lines of fine pubescence along the ridges on the upper stem.
Figure 12: Appalachian Bellwort - U. puberula
Note there are multiple flowers per stem rather than one as in U. sessilifolia.


Figure 13: Appalachian Bellwort - U. puberula
(USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 519.)


Uvularia sessilifolia is commonly called Wild Oats. It is common across the entire state of N.C. and likes moist hardwood forests and bottomlands. The plants grow in loose open colonies. The glabrous stems have alternate sessile leaves. The leaves tend to be glabrous and glaucous on the abaxial side. There is usually only one flower per branch and the pale yellow to cream colored flowers are approximately 1.3-2.5 cm in length with no bracts subtending the flowers (See Figures 14, 16). 


Figure 14: Wild Oats - U. sessilifolia
Note there is only one flower per branch,
also note the glabrous stems and leaves.


Figure 15: Wild Oats - U. sessiilifolia
(USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 519.)

Uvularia sessilifolia (13083402415).jpg
Figure 16: Wild Oats - U. sessilifolia
(Shenandoah National Park Public Domain Image, Uvularia sessilifolia (13083402415).jpg)




TABLE 3: Summary of Traits for UvulariaSpecies with Sessile Leaves 
(major differences are in bold-face)
Traits
Uvularia floridana
Florida Bellwort

Uvularia puberula
Carolina or Appalachian Bellwort
Uvularia sessilifolia
Wild Oats
Distribution
Not found in N.C.
Rare across its range
Common in the mountain and piedmont areas, uncommon in coastal region of N.C.
Common across entire state of N.C.
Habitat

Mesic
Mesic to dry acidic forests
Mesic forests and bottomlands
Bloom Time

March - April
March - May
March - May
Flowers
Usually 1 flower per branch, 2-3 cm long, white- yellowish, with foliaceous bract

May have 3 flowers per branch, ~ 1-2-2.5 cm long, pale yellow, no bract
Usually  1 flower per branch, ~ 1.3-2.5 cm long, pale straw yellow, no bract
Foliage
Sessile, glabrous, somewhat succulent/fleshy
Sessile, thick, rigid, dark green, and shiny on both surfaces, pubescent along abaxial veins
Sessile, glabrous, often glaucous underneath
Stems
Glabrous
Stems with pubescence along the ridges
Glabrous



The foliage of Uvularia species can also be confused with other species such as Rosy Twisted Stalk, (Streptopus lanceolatus var. lanceolatus), Solomon’s Plume, (Maianthemum racemosum var.racemosum), Solomon’s Seal species (Polygonatum biflorum, and P. pubescens), Yellow Mandarin, (Prosartes lanuginosa), and  Spotted Mandarin, (Prosartes maculta). None of the species above have perfoliate leaves which separates them all from Uvularia perfoliata, and U. grandiflora.  Solomon’s Seal and Solomon’s Plume can be distinguished from the other Uvularia species by having single, unbranched, stout stems, and by their larger size (usually > 40 cm in height). Solomon’s Plume also has petioled leaves (2-15 mm long) rather than sessile leaves to further differentiate it from Uvularia. Rosy Twisted Stalk is usually once branched similar to the sessile species of Uvularia, but the leaves are distinctly clasping and have ciliated margins. The Mandarin (Prosartes) species have multiple branching branches whereas the sessile-leaved Uvularia are unbranched or once branched. Mandarin species additionally tend to be larger (> 40 cm) than the similar sessile-leaved Bellworts. 

Hopefully, you will enjoy your new knowledge and delight in identifying our Uvularia species as you hike and explore.



RESOURCES:

1. “Uvularia.” Pacific Bulb Society | Mediterranean (Summer-Dry) Climateswww.pacificbulbsociety.org/pbswiki/index.php/Uvularia.

2. Weakley, Alan S. Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC: U of North Carolina Herbarium, North Carolina Botanical Garden, U of North Carolina, Chapel Hill, 2015. Print.

3.Radford, Albert Ernest, Harry E. Ahles, and Clyde Ritchie Bell. Manual of the Vascular Flora of the Carolinas. Chapel Hill, NC: U of North Carolina Press, 1983. Print.

4. Flora of North America Editorial Committee, eds.  1993+.  Flora of North America North of Mexico.  20+ vols.  New York and Oxford. Print.

5.http://www.fnai.org/FieldGuide/pdf/Uvularia_floridana.pdf
2 variations of U puberula:

6. Uttal, Leonard J. “Notes on Uvularia Puberula Michaux (Liliaceae).” Castanea, vol. 56, no. 1, 1991, pp. 70–70. JSTOR, JSTOR, www.jstor.org/stable/4033424.

7. All photos were taken and are the property of Tracie Jeffries unless otherwise noted.




Wednesday, August 8, 2018

NORTH CAROLINA SANDHILLS

Figure 1:  Sandhills Bog Lily (Lilium pyrophilum) is an endangered species. It is one of the many species that benefit from prescribed burns within the fire dependent plant communities of the Sandhills. 


I recently visited the North Carolina sandhill region. I meet my friend Will Stuart and he kindly showed me some of the more interesting areas and unique plants of the region. 

The Sandhill region of North Carolina is part of a larger geographical province that runs along the eastern United States coastal plain from N.C. through Georgia. The area consists of ancient sand dunes created and left behind by seas that once covered the region.  The Sandhills are characterized by deep, nutrient-poor, sandy soils, xeric conditions, and frequent fires. This unique habitat creates many challenges to the fauna and flora that live there. But, despite these challenges the area is one of the most biodiverse in the United States. One source states, “this area is home to one of the most diverse ecosystems in the U.S. — rivaling even the diversity of the tropical rainforest. Beneath the mighty boughs of the Longleaf Pine forest, 150 to 300 species of groundcover plants per acre can be found. Sixty percent of the amphibians and reptiles inhabiting in the Southeast can also be found here, along with more breeding birds than in any other southeastern forest type. Combine this richness with the unique species found in the deciduous Piedmont forest and it’s no wonder that our region is what naturalists call “a biological hot spot.”In N.C. the Sandhills area covers parts of Cumberland, Harnett, Hoke,  Lee, Montgomery, Moore, Richland, and Scotland Counties. 

 

Figure 2: Spurred Butterfly Pea (Centrosema virginianum) common in disturbed areas such as roadsides and dry pine-oak forests.
Figure 3: Sandhill Morning Glory (Stylisma patens) This diminutive plant often forms large mats of growth on the dry pine forest floors.

One of the most widespread plant community within the Sandhills is the Dry Longleaf Pineland which is dominated by an open canopy of Longleaf Pine (Pinus palustris) with a sub-canopy of scrub oaks such as Turkey Oak (Quercus laevis),  Sand Post Oak (Quercus margarettae), Bluejack Oak (Quercus incana), (Q. falcata) and a herbaceous layer dominated by grasses such as Wiregrass (Aristida stricta) and Purple Three Awn Grass (Aristida purpurea var. longiseta).


Figure 4: This shows a typical Dry Longleaf Pineland dominated by an open canopy of pines with a sub-canopy of scrub oaks.
Figure 5: Blackjack Oak (Quercus marilandica) one
of the many oak species found in the sandhills.

Other plant communities are mostly variants of this community based on hydrology. The rolling terrain seems to repeat a general pattern of higher, dryer, and more open pine dominated savannas to moister slopes and eventually low wet areas where water drains or stands. As one walks down from the very open dry pine ridges towards the lower wet areas the vegetation becomes noticeable thicker, basically creating a dense wall of vegetation. The classification of these plant communities varies greatly within the literature. I will use the terminology that Bruce Sorrie uses in his guide,Wildflowers of the Sandhills Region.For a more detailed and technical community classification read the, Guide to the Classification of the Natural Communities of North Carolina (4th Approximation).3


Figure 6: This illustrates one of the wetter habits such as a seepage slope that can support a wide variety of species including  carnivorous plants. Note the Yellow Pitcher Plants (Sarracenia flava) in the foreground, and the pines growing on the dryer elevations in the background.

                                                                  
Figure 7: There was a nice variety of Rhexia or Meadow Beauty species blooming in the area. This is Bog or Ciliate Meadow Beauty (Rhexia petiolata).
Note the short, straight anthers.

Figure 8: This is White Meadow Beauty (Rhexia mariana var. exalbida). It is an easy Rhexia  to identify - look for the combination of white flowers and small linear leaves.

Figure 9: This is Savanna Meadow Beauty (Rhexia alifanus). It is our tallest Rhexia species with unbranched stems and blue-green leaves that hug the stem.
Figure 10: Rhexia alifanus
Figure 11: Nash's Meadow Beauty (Rhexia nashii), this
species has characteristic gland tipped hairs.



Figure 12: Many people know to look out for Poison Ivy (Toxicodendron radicansand Poison Oak ( Toxicodendron pubescens) but, Spurge Nettle (Cnidoscolus stimulus) has stinging hairs that can trigger a burning sensation and a rash.

Figure 13: Sandhill Bean (Phaseolus sinuatus), is a rare plant that likes the dryer pinewoods. It is easily overlooked because the flowers are very small and close to the ground. But, once spotted it is easy to distinguish by its variegated leaves and uniquely spiraled keel. 

Figure 14: The variegated leaves of Sandhill Bean (Phaseolus sinuatus)


If you would like to visit the sandhills I suggest visiting Weymouth Woods Sandhills Nature Preserve (https://www.ncparks.gov/weymouth-woods-sandhills-nature-preserve), the Greenway Trail System near Southern Pines (https://www.southernpines.net/185/Greenway-Trail-System), and the Sandhill Gamelands near Hoffman N.C. (https://www.visitnc.com/listing/toEK/sandhills-gamelands). Most of the photos above were taken in late July but the Sandhills are a great place to visit year-round (see photos below). Go explore the Sandhills and see what you can find!

Figure 15: Pine Barren Gentian (Gentiana autumnalis) blooms later in the fall.

Figure 16: Yellow Fringed Orchid (Platanthera ciliaris) blooms late summer. 

Figure 17: Common Grass-pink (Calopogon tuberosus) is a species that inhabits seepage slopes and other wet habitats. It is also a species that benefits from frequent prescribed burning. Common Grass-pink blooms in from late spring into the early summer.
Figure 18: Small Spreading Pogonia (Cleistes bifaria)
blooms late spring into early summer.

Figure 19: Large Spreading Pogonia (Cleistes divaricata)
blooms in late spring through early summer.




Resources:

1. “Sand and Clay, Fire and Water: The Story of the Sandhills/Piedmont Area.” Sandhills Heritage Gateway, sandhillsheritagegateway.org/about/sandhills-piedmont-areas-geology-history/.

2. Sorrie, Bruce A. A Field Guide to Wildflowers of the Sandhills Region: North Carolina, South Carolina, Georgia. University of North Carolina Press, 2011.

3.Schafale, Michael P. “Natural-Community-Classification-Fourth-Approximation-2012.Pdf.” Natural Heritage Program, Department of Environment and Natural Resources, 1 Mar. 2012, www.ncnhp.org/references/publications/guide-classification-natural-communities-north-carolina-4th-approximation.

4. Way, Albert. "Longleaf Pine Ecosystem." New Georgia Encyclopedia. 08 June 2017. Web. 18 December 2017.

5. Crofton, Elizabeth W. (2001). "Wildnotes: Flora and Fauna of the Longleaf Pine-Grassland Ecosystem".The Fire Forest Longleaf Pine-Wiregrass Ecosystem. 8 (2): 69–77.

6.Radford, Albert Ernest, Harry E. Ahles, and Clyde Ritchie Bell. Manual of the Vascular Flora of the Carolinas. Chapel Hill, NC: U of North Carolina Press, 1983. Print.

7. Weakley, Alan S. Flora of the Southern and Mid-Atlantic States. Chapel Hill, NC: U of North Carolina Herbarium, North Carolina Botanical Garden, U of North Carolina, Chapel Hill, 2015. Print.