Oclemena E.L.Greene, occurs as little genus of flowering plants from the helianthus personal (Asteraceae).

These are indigene to northeastern Northerly United states, noticed around damp or even even dry forest, & for instance around clearings inside the outdoors, or in acid peat bog & peat.

A finely woolly stem grows in the zig-zag fashion to the height 30-100 cm (1 to 3 feet). It can be red at its base.

A lanceolate leaves are numerous, ordered within the coiling whorl about one stem. It may be sharply toothed along a marginside (when in O. acuminata) or even smooth (when within O. nemoralis). A leaves contain sessile resin glands.

A flower heads consist of flat-topped pink to rose-violet ray florets & yellow disk florets. There are the single to two or three in the plant, growing in a slender peduncle. A disk flowers come short expanded at a top. A scarious flowered bracts consist of narrow chlorophyllous bands, tinted with purple along a midvein.

A stipitate ovaries are generally compressed & indicate on the surface microscopic, cylindric glands. A fruit occurs as glandular achene with a double pappus of 2 bristled whorls.

A chromosome base number is x=Ix.

A Kew database [http://www.rbgkew.org.uk/cgi-bin/web.dbs/genlist.pl?COMPOSITAE Vascular Plant Families and Genera] categorizes Oclamena under the genus Aster L. However taxonomically, Oclemena belongs to the N Western clade of a tribe Astereae, as a basal member of one of the independent branches (Brouillet, Allen, Semple & Ito 2001).

Species

Oclemena acuminata (Michx.) Greene : Whorled Wood Aster, Sharpleaf Aster, White Wood Aster Oclemena × blakei (Porter) Nesom (O. acuminata × O. nemoralis) : Blake’s Aster Oclemena nemoralis (Ait.) Greene : Bog Aster, Bog Nodding Aster. Oclemena reticulata (Pursh) Nesom : Pinebarren Whitetop Aster.

Reference

SEMPLE, J.C., S. HEARD & CHUNSHENG XIANG. 1996. A Asters of Ontario (Compositae: Astereae): Diplactis Raf., Oclemena Greene, Doellingeria Nees & Aster L. (including Canadanthus Nesom, Symphyotrichum Nees & Virgulus Raf.) SEMPLE, J.C., S.B. HEARD & L. BROUILLET. 2002. Cultivated & native asters of Ontario (Compositae: Astereae): Aster L. (including Asteromoea Blume, Diplactis Raf. & Kalimeris (Cass.) Cass.), Callistephus Cass., Galatella Cass., Doellingeria Nees, Oclemena E.L. Greene, Eurybia (Cass.) S.F. Gray, Canadanthus Nesom, & Symphyotrichum Nees (including Virgulus Raf.). U. Waterloo. Biol. Series There are no. 4One: 1-134.