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Genus of flowering plants From Wikipedia, the free encyclopedia
Oclemena is a small genus of North American flowering plants in the tribe Astereae within the family Asteraceae.[1][2]
| Oclemena | |
|---|---|
 | |
| Oclemena nemoralis (Bog-aster) | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Astereae |
| Subtribe: | Oclemininae G.L.Nesom |
| Genus: | Oclemena Greene |
| Synonyms | |
| |
It is native to northeastern North America, found in wet or dry woodlands, and sometimes in clearings in the woods, or in acid bogs and peat.[3]
The finely woolly stem grows in a zig-zag fashion to a height 30–100 cm (1–3 ft). It may be red at its base.[3]
The lanceolate leaves are numerous, arranged in a spiral whorl around a single stem. They can be sharply toothed along the margin (as in O. acuminata) or smooth (as in O. nemoralis). The leaves contain sessile resin glands.[3]
The flower heads consist of flat-topped pink to rose-violet ray florets and yellow disk florets. There are one to a few on a plant, growing on a slender peduncle. The disk flowers are abruptly expanded at the top. The scarious floral bracts consist of narrow chlorophyllous bands, tinted with purple along the midrib.[3]
The stipitate ovaries are generally compressed and show on the surface minute, cylindrical glands. The fruit is a glandular achene with a double pappus of two bristled whorls.[3]
The chromosome base number is x=9.
The Kew database Vascular Plant Families and Genera categorizes Oclamena under the genus Aster L. But taxonomically, Oclemena belongs to the North American clade of the tribe Astereae, as a basal member of one of the main branches.[4]
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