|Photo by Jeff Norcini, Atlas of Florida Vascular Plants|
|Division:||Magnoliophyta - Flowering plants|
|Class:||Magnoliopsida - Dicotyledons|
|Natural range of Crocanthemum corymbosum from USDA NRCS Plants Database.|
Common names: Pine barren frostweed; pinebarren sunrose
Synonym: Helianthemum corymbosum Michaux.
Generally, for the Crocanthemum genus, they are erect, heraceous or suffrutescent perennials with alternate, stellate-pubescent leaves. There are two types of flowers, chasmogamous and cleistogamous. Chasmogamous flowers are on the pedicels that elongate to usually more than 1 cm long with large showy, tallow petals; there are numerous stamens and large sepals. The cleistogamous flowers are on the pedicels are usually less than 3 mm long, where the petals are absent, the stamens are few and the sepals are smaller than those of the chasmogamous flowers. The sepals are in 2 whorls, the outer are narrower than the inner. The capsule is 3-locular. 
Specifically, for Crocanthemum corymbosum species, the roots have tuberous thickenings, the stems grow 1.3-5 tall, stellate canescent. The basal leaves are absent; the stem leaves 10-20, elliptic to oblanceolate, growing 1.5-3 cm long, and 5-10 mm wide, stellate-canescent above, tomentose beneath. The petioles 1-3 mm long. The cleistogamous flowers in compact terminal cymes; pedicels usually less than 5 mm long; the sepals and capsules 3-4 mm long. The chasmogamous flowers on pedicels 1-2 cm, scattered in the compact, the cleistogamous infloresence, or arising from its base; petals ca. 1 cm long; sepals and ovoid capsule, 5-7 mm long, pilose. The seeds are reddish brown in color, 1-1.2 mm long.
It can been found in upland, well-drained sandy habitats, such as scrubby flatwoods (Pearson 1954). It has been observed growing in drying sand (FSU Herbarium).
Associated species include Quercus virginiana, Quercus myrtifolia, Quercus pumila, Quercus chapmanii, Serenoa repens, Osmanthus americanus, Vaccinium myrsinites, Aristida stricta, and Trilisa odoratissima" (Pearson 1954).
The canary yellow flowers bloom March through June.
Crocanthemum corymbosum is visited by sweat bees such as Lasioglossum nymphalis (family Halictidae).
Conservation, cultivation, and restoration
References and notes
Florida State University Robert K. Godfrey Herbarium database. URL: http://herbarium.bio.fsu.edu. Last accessed: October 2015. Collectors: Loran C. Anderson. States and Counties: Florida: Franklin. Compiled by Tall Timbers Research Station and Land Conservancy.
Pearson, Paul G.. “Mammals of Gulf Hammock, Levy County, Florida”. American Midland Naturalist 51.2 (1954): 468–480.
- Weakley, A.S. 2015. Flora of the southern and mid-atlantic states. Working Draft of 21 May 2015. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
- [Southeastern Flora]Accessed: December 11, 2015
- []Accessed: December 14, 2015
- 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. 718-9.
- []Accessed: December 15, 2015
- [Hawthorn Hill Flowers Blogspot]
- Deyrup, M.A. and N.D. 2015. Database of observations of Hymenoptera visitations to flowers of plants on Archbold Biological Station, Florida, USA.