Herbs annual, usually covered with dendroid and stellate hairs. Leaves flat or flattened, filiform or linear to lanceolate, margin entire; veins 1-3. Flowers solitary in bract axils, bisexual, forming dense or loose, spikelike inflorescences on upper stem and branches; bractlets absent. Perianth segments 1-3 or absent, unequal, membranous, upper segment larger, lower 2 segments smaller or absent. Stamens 1-3 or 5; filaments linear, flattened, usually longer than perianth; anthers oblong, 2-loculed, longitudinally dehiscent. Ovary ovoid or ellipsoid, compressed; style short; stigmas 2. Fruit a utricle, compressed, oblong to orbicular in outline, abaxially convex, adaxially plane or slightly concave, margin usually winged, entire or erose, plane or crisped, apex emarginate or rounded to acute, beaked; beak with a 2-fid tip formed from style bases; pericarp adnate to seed. Seed vertical; embryo horseshoe-shaped; radicle inferior; perisperm copious.
Herbs, annual, with dendroid (branched), sometimes almost stellate hairs, occasionally glabrous, or becoming glabrous at maturity. Stems erect or ascending, rarely prostrate, branched (rarely simple), not jointed, not armed, not fleshy. Leaves alternate, sessile; blade [obovate-elliptic, elliptic], lanceolate, linear-lanceolate, linear, or filiform, flat or convolute at maturity, base truncate, margins entire [indistinctly undulate], apex acute. Inflorescences terminal spikes; flowers solitary in axils of ovate, lanceolate, or linear leaflike bracts (also in axils of middle and lower leaves and branches in C. ochotense and occasionally in some other species). Flowers bisexual; perianth segments absent or 1(-3), scalelike; stamens 1-3(-5); ovary superior; stigmas and styles 2. Fruiting structures: style bases at maturity forming characteristic bifid rostrum ("beak") at apex of achenes [concealed by wing in some species], achenes largely exposed, vertical, sessile, convex to almost plane abaxially, plane, ± concave adaxially, lenticular, ovate, obovate, elliptic, or orbiculate [elongate], margins winged or wingless, apex acute, glabrous and shiny, or maculate and/or slightly verrucose; wing (if present) with entire, undulate, or minutely erose-denticulate margins (in some species emarginate at apex, or long-adnate to style bases); pericarp strongly accrescent to seed or small portions not accrescent, forming small whitish bladders ("warts"). Seeds vertical; embryo horseshoe-shaped or almost circular; perisperm abundant. x = 9.
"Fls perfect; cal minute, scarious, of a single adaxial sep, or sometimes also with 2 smaller abaxial sep; stamens 1–3, exsert; ovary compressed, erect, exceeding the cal; styles 2, short; fr indurate, indehiscent, plano-convex, erect, angled or narrowly margined or winged; pericarp closely adherent to the erect seed; embryo annular; much-branched herbs with linear or subulate lvs, the fls solitary in the axils of the bracts, forming a continuous or interrupted terminal spike. Late summer, fall. 50, Eurasia."
Betancourt, J. L. et al. 1984. Pre-Columbian age for North American Corispermum L. (Chenopodiaceae) confirmed by accelerator radiocarbon dating. Nature 311: 653-655. Iljin, M. M. 1929. Novye vidy roda Corispermum L. (Corispermi generis species novae.) Izv. Glavn. Bot. Sada S.S.S.R. 28: 638-654. Klokov, M. V. 1960. O dneprovskikh i nekotorykh drugikh vidakh roda Corispermum L. (De Corispermis Borysthenicis necnon aliis nonnulis.) Bot. Mater. Gerb. Bot. Inst. Komarova Akad. Nauk S.S.S.R. 20: 90-136. Maihle, N. J. and W. H. Blackwell. 1978. A synopsis of North American species of Corispermum (Chenopodiaceae). Sida 7: 382-391. Mosyakin, S. L. 1995. New taxa of Corispermum L. (Chenopodiaceae), with preliminary comments on taxonomy of the genus in North America. Novon 5: 340-353. Mosyakin, S. L. 1998. New subsections of Corispermum L. (Chenopodiaceae). Thaiszia 7: 9-15.
|Bugseed, tick-seed [Greek coris, bug, and spermum, seed]|