Contains 6 accepted taxa overall.
Characteristics
Helianthemum is now considered an Old World genus characterized by usually opposite leaves with stipules, whereas Crocanthemum is New World with alternate and estipulate leaves (Arrington 2004). The closely related genus Hudsonia requires re-examination to clarify its separation from Crocanthemum.
Classification
Citation
CROCANTHEMUM Spach, Ann. Sci. Nat., Bot., ser. 2. 6: 370. 1836.
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TYPE: Crocanthemum carolinianum (Walter) Spach 1836. (Cistus carolinianus Walter 1788.) Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 539. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Crocanthemum arenicola | COASTALSAND FROSTWEED | Native | ||
| Crocanthemum carolinianum | CAROLINA FROSTWEED | Native | ||
| Crocanthemum corymbosum | PINEBARREN FROSTWEED | Native | ||
| Crocanthemum georgianum | GEORGIA FROSTWEED | Native | ||
| Crocanthemum nashii | FLORIDA SCRUB FROSTWEED | Native | ||
| Crocanthemum rosmarinifolium | ROSEMARY FROSTWEED | Native |
[Family identification key]
1. Larger leaf blades 9-35 mm wide, 1.5-3.5 times longer than wide, the lower surface and lateral veins usually plainly visible
1. Larger leaf blades 2-9(13) mm wide, 2.5-10 times longer than wide, the lower surface and often the lateral veins concealed or obscured by the dense tomentum
2
2. Ovary and fruit densely stellate-pubescent, at least in the upper half
3
2. Ovary and fruit glabrous (persistent inner sepals may be pubescent)
4
3. Flowers in terminal umbellate clusters; fruit 2-valved
3. Flowers in leafy thyrses; fruit 3-valved
4. Leaf blade attenuate-cuneate at the base; flowers in leafy thyrses
4. Leaf blade cuneate to rounded-cuneate at the base; flowers mostly terminal or subterminal
5
5. Basal rosette-like leaves absent; flowers usually 5-45 per cluster or cyme (including both chasmogamous and cleistogamous flowers)
5. Basal rosette-like leaves sometimes present; flowers usually 1-3(7) per cluster or cyme (including both chasmogamous and cleistogamous flowers)
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Heteromeris | Heteromeris Spach, Ann. Sci. Nat., Bot., ser. 2. 6: 370. 1836. | TYPE: Non designatus. | |
| Horanthes | Horanthes (Rafinesque) Rafinesque, Sylva Tellur. 132. 1838. | BASIONYM: Anthelis Rafinesque, subg. Horanthes Rafinesque, New Fl. 3: 30. 1838 ("1836"). | TYPE: Non desigantus. |
| Taeniostema | Taeniostema Spach, Ann. Sci. Nat., Bot., ser. 2. 6: 371. 1836. | TYPE: Taeniostema micranthum Spach |