Hab. A weed by roadsides and among cultivated maize; also recorded from bare patches of rock in Aristida-Harpachne grassland; altitude-range uncertain, recorded from 1620-1680 m.
Distr. K3, 4; native of Australia, doubtfully so in New Zealand and New Caledonia; introduced, often through wool, into other parts of the world including Britain.
Kenya. Trans-Nzoia District: 32 km. SE. of Kitale, 21 June 1948,Bogdan 1738a!; Nairobi: Karura Forest, 14 Sept. 1951, Bogdan 3263!; Nairobi-Kiambu road, 3 Dec. 1950,Verdcourt 391!
Annual herb similar to
Chenopodium pumilio , prostrate to erect, normally branched near base into simple to much branched stems up to 60 cm. long,green rarely red-tinged, pubescent and glandular, aromatic. Leaves ovate to elliptic rarely narrow-elliptic in outline, small, mostly 0.3-3 cm. long and 0.25-2 cm. wide, sometimes as wide as long, with 2-4 (-6) usually coarse sometimes obscure entire or denticulate teeth, or lobes on each margin, rarely entire or almost so, glands between veins on lower side of leaves sessile to subsessile not accompanied by hairs unless on veins. Flowers greenish, minute, about 0.4-0-75 mm. in diameter, sessile or subsessile in small rounded axillary clusters at most of the nodes. Sepals normally 5,pubescent and glandiiar, each with a conspicuous wing-like keel broadening upwards. Stamen 1. Seed (Fig. 2/8,p. 3) as in Chenopodium pumilio .
Aellen in Verh. Naturf. Gesellsch. Basel 44 (1): 312-3 (1933) splits
Chenopodium carinatum into two varieties - Chenopodium carinatum var. carinatum (which he called Chenopodium carinatum var. holopterum (Thell.) Aell. ) and Chenopodium carinatum var. melanocarpum (Black) Aellen , differing in their perianth-segments. The Chenopodium carinatum var. melanocarpum is treated as a distinct species, , by J. M. Black in Fl. S. Austral., ed. 2,2: 289 (1948) . Verdcourt 550! (Nairobi) and Bogdan 3263! are certainly Chenopodium melanocarpum var. carinatum ; but other specimens do not show fully mature fruits and may or may not be the same variety.
Ulbr. in E. & P. Pf., ed. 2,16c: 494 (1934).
Prodr. Fl. Nov. Holl. 1: 407 (1810).
Aellen in Verh. Naturf. Gesellsch. Basel 44 (1): 312 (1933).