Siegesbeckia
L.
Herbs, annual, erect or procumbent or scapose; stems with multicellular hairs, often
gland-tipped. Leaves simple, opposite, ovate-elliptic, entire or serrate, viscid pubescent;
petioles mostly winged, sometimes basally auriculate to nearly connate-perfoliate.
Inflorescence a many-flowered panicle. peduncles glandualr hairy; bracts foliaceous;
bractlets scale-like. Heads radiate, small. Involucral bracts 2-seriate; outermost linear-spathulate, apically rounded, mostly copiously stipitate-glandular; inner ovate, apically
deltoid to acuminate, stipitate-glandular. Receptacle small, conical. Paleae ovate,
scarious. Ray florets 5 - 15; corolla yellow. Style branches short. Disc florets many;
corolla tube campanulate, with 5 deltoid lobes. Anthers yellow-green. Style branches
flattened. Achenes black, minutely striate, curved, sometimes strongly angled. Pappus
lacking.
In the warmer regions of old and new world; ca 9 species, 1 in India.
Literature. HUMBLES, J.E. (1972). Observation on the genus Siegesbeckia L. Ciencia Y. Nanturaleza 13: 1-19. MALIK, C. (1961). Siegesbeckia orientalis L., A species complex in Western Himalayas. U.A.R. Journ. Bot. 4: 167-170.
In the warmer regions of old and new world; ca 9 species, 1 in India.
Literature. HUMBLES, J.E. (1972). Observation on the genus Siegesbeckia L. Ciencia Y. Nanturaleza 13: 1-19. MALIK, C. (1961). Siegesbeckia orientalis L., A species complex in Western Himalayas. U.A.R. Journ. Bot. 4: 167-170.
