life
cycle - native annual, reproducing by seed
stems -
upright, branched above, smooth to slightly hairy, 4-angled,
frequently purplish growth
habit 1, growth
habit 2, growth
habit 3, stem
leaves -
opposite, often simple above, pinnately compound, 3-5 leaflets;
leaflets lanceolate, toothed, terminal leaflet stalked, very
small hairs leaves
1, leaves
2, leaves 3
flowers -
heads of yellow-orange disk (tubulate) florets and yellow ray
(ligulate) florets when present are few, small and rounded;
axillary and terminal, long stalked, leaf-like bracts at base
flowers
1, flowers 2, flowers
3, flowers
4
seedpods - flat, brown, two barbed spines at one end
