Description
Key Characters:
Growth Form:
Annual herbs, usually pungent–bristly.
Stems:
Stems erect or spreading.
Roots:
Leaves:
Leaves simple.
Alternate.
Margins usually entire.
Stipules absent.
Flowers:
Flowers usually in naked or sparsely bracted scorpioid cymes.
Flowers bisexual (perfect).
Calyx 5-lobed, 1 to several lobes ± connate, persistent.
Corolla yellow or orange, tubular or salver form, the throat without appendages, the lobes occasionally slightly irregular.
Stamens as many as and alternate with the corolla lobes, inserted on the tube, sometimes unequal, often with basal appendages; anthers dithecal, opening by longitudinal slits.
Ovary superior, 2(4–5)-carpellate, the carpels connate to various degrees, 2-celled, often becoming 4-celled by means of false septa, entire to 4-lobed; ovules usually 4, 2 per carpel, eventually 1 per cell, sometimes fewer by abortion, anatropous, erect, ascending, or nearly horizontal, rarely pendulous; style 1, gynobasic, arising from between the essentially distinct ovary lobes; filiform; stigma capitate, 2-lobed.
Fruit:
Nutlets gray.
Seeds 1–4; endosperm absent or; if present; fleshy and scanty.
Ploidy:
Habitat:
Elevation Range: