Troximon
(from troximos, edible, which the plants of this genus are not). SYN. Agoseris. Including Ammogeton and Macrorhynchus. ORD. Compositae. A genus comprising about sixteen species of hardy, almost stemless, annual or perennial herbs, natives of North-western and Southern extra-tropical America. Flower-heads yellow or orange, homogamous; florets ligulate, truncately five-toothed at apex; involucral bracts in many series, the outer ones gradually shorter and broader; receptacle flat, naked or foveolate, rarely bearing a few paleae between the florets; achenes glabrous; pappus bristles copious; scape erect, leafless, one-headed. Leaves radical, entire, deeply toothed, or pinnatifid. T. glaucum and its variety are now probably the only known garden representatives of the genus, although others have been introduced. They are perennials, thriving in sandy loam. Propagation may be effected by divisions.
T. glaucum (glaucous). fl.-heads bright yellow, nearly 1in. in diameter; involucral bracts loosely imbricated in three or four series. May and June. l. linear-lanceolate, acute, entire, or rarely with one or two small teeth. h. 1ft. United States, 1811. (B. M. 1667.) T. g. dasycephalum (thick-headed). fl.-heads, receptacle often bearing a few chaffy scales among the florets; involucre woolly, at least when young. l. (and scape) often somewhat pubescent. (B. M. 3462). SYN. Ammogeton scorzoneraefolium.