Stylisma humistrata

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Stylisma humistrata
Stylisma humistrata Gil.jpg
Photo was taken by Gil Nelson
Scientific classification
Kingdom: Plantae
Division: Magnoliophyta – Flowering plants
Class: Magnoliopsida – Dicotyledons
Order: Solanales
Family: Convolvulaceae
Genus: Stylisma
Species: S. humistrata
Binomial name
Stylisma humistrata
(Walter) Chapm.
STYL HUMI dist.jpg
Natural range of Stylisma humistrata from USDA NRCS Plants Database.

Common name: Southern dawnflower

Taxonomic notes

Synonyms: Bonamia humistrata (Walter) A. Gray; Breweria humistrata (Walter) A. Gray


In Radford (1964) this species was recognized as a synonym under Bonamia humistrata which is where this description originated from. "Prostrate or spreading, herbaceous perennial vines, from fascicled or single, slender linear roots. Stems several to many, 0.5-2 m long, the basal portions appearing rhizomatous, older plants often forming large mats or clumps. Leaves entire. Corolla white or pink, campanulate to funnelform, 8-24 mm long; sepals still or leathery, 5-10 mm long, obtuse or acute; stigmas globose or peltate, styles 2, united at base or almost to summit. Capsule chartaceous, 2-locular, 4-seeded, 4-8 mm long, ½ as wide." [1]

"Leaves elliptic to elliptic-lanceolate, 2.5-5 cm long, 1.2-2.8 cm wide, reduced, upward, mucronate, subcordate, sparsely pubescent to pilose, the trichomes stellate or simple. Flowers 1-3 (rarely more) on peduncles normally 1-2X the length of the subtending leaf, bractlets inconspicuous; sepals glabrous; corolla white, usually 15-20 mm long; filaments pubescent to pilose; basal third or less of styles united." [1]


It is found in the Coastal Plains of southwestern Georgia (Baker County). [2]



Stylisma humistrata can be found in longleaf pine-oak woodlands, longleaf pine-wiregrass-scrub oak ridges, annually burned pinelands, mesic woodlands, floodplains, hardwood hammocks, [3] and subxeric and xeric areas in longleaf pine-oak communities.[4] It can also be found along roadsides, edges of cornfields, recently logged oak-pine slopes, and old fields. [3] Soil types include loamy sand, loam, and red sandy clay. [3] Associated species include Spigelia gentianoides and Quercus incana. [3]


Flowers and fruits May through October. [3]

Seed dispersal

This species is thought to be dispersed by gravity. [5]

Seed bank and germination

S. humistrata exhibits physical seed dormancy and does not require light for germination. [6]

Conservation and management

Cultivation and restoration

Photo Gallery

References and notes

  1. 1.0 1.1 Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 863. Print.
  2. Kirkman, L. K., K. L. Coffey, R. J. Mitchell and E. B. Moser. 2004. Ground cover recovery patterns and life-history traits: implications for restoration obstacles and opportunities in a species-rich savanna. Journal of Ecology 92:409-421.
  3. 3.0 3.1 3.2 3.3 3.4 Florida State University Robert K. Godfrey Herbarium database. URL: Last accessed: July 2015. Collectors: Loran C. Anderson, R. A. Norris, Robert K. Godfrey, R. Komarek, J. M. Kane, Jean Wooten, R. R. Smith, T. Myint, C. Jackson, Gary R. Knight, Robert Kral, Mabel Kral, S. B. Jones, Carleen Jones, Gwynn W. Ramsey, H. L. Stripling, T.E. Smith, R. D. Whetstone, James G. Teer, John W. Thieret, Sidney McDaniel, C. Ritchie Bell, Roomie Wilson, L. H. Shinners, R. L. Wilbur, Delzie Demaree, Harry E. Ahles, J. A. Duke, Lisa Keppner, Ed Keppner. States and Counties: Alabama: Clarke, Escambia, Geneva, Houston, Sumter. Arkansas: Bradley. Florida: Bay, Calhoun, Gadsden, Jackson, Lafayette, Leon, Liberty, Madison, Okaloosa, Washington. Georgia: Baker, Early, Grady, Lowndes, Thomas. Louisiana: Bienville, Tangipahoa, Union, Washington. Mississippi: Forrest, Jones, Wayne, Winston. North Carolina: Bladen, New Hanover, Narthampton, Pamlico. Texas: Woods. Compiled by Tall Timbers Research Station and Land Conservancy.
  4. Carter, R. E., M. D. MacKenzie, D. H. Gjerstad and D. Jones. 2004. Species composition of fire disturbed ecological land units in the Southern Loam Hills of south Alabama. Southeastern Naturalist 3:297-308.
  5. Kirkman, L. Katherine. Unpublished database of seed dispersal mode of plants found in Coastal Plain longleaf pine-grasslands of the Jones Ecological Research Center, Georgia.
  6. Jayasuriya, K.M.G. Gehan, Jerry M. Baskin and Carol C. Baskin (2008). Dormancy, germination requirements and storage behaviour of seeds of Convolvulaceae (Solanales) and evolutionary considerations. Seed Science Research 18: 223-237.