Annual or perennial, erect or procumbent to decumbent. Leaves simple entire, petiolate or sessile; bases usually sheathing, amplexicaul or perfoliate lamina acicular, linear, lanceolate, oval, ovate, obovate or almost round Umbels compound. Rays 1 to numerous. Involucral bracts present or lacking. Involucel of a few to many bractlets or lacking. Flowers yellow, yellowish-whit or greenish, dark purple to almost black. Calyx teeth obsolete. Stylopodium light brown to black, depressed to conical. Fruit elliptic to oblong or ovoid; ridges usually prominent, winged or not winged; furrows I-4-vittate; com- missure 2-6-vittate, Inner seed face plane to slightly concave.