Flora of the Southeastern United States
2022 Edition

Colors

Data mode

Key to Setaria

1 None of the spikelets subtended by a stiff bristle
1 Terminal spikelet on each branch subtended by a single bristle (other spikelets also sometimes so subtended)
..2 Most spikelets other than the terminal lacking a subtending bristle; leaves flat or plicate.
....3 Blades flat, 2-5 mm wide; only terminal spikelet of each branch with a subtending bristle
....3 Blades plicate, 10-80 mm wide; a single bristle sometimes present below non-terminal as well as terminal spikelets.
......4 Annual; leaves 10-25 mm wide
......4 Perennial; leaves 20-80 mm wide
..2 All spikelets subtended by 1 or more bristles; leaves flat.
........5 Bristles 4-12 below each spikelet.
..........6 Annual, with fibrous roots.
............7 Spikelets 2.0-2.5 mm long; bristles reddish
............7 Spikelets 3.0-3.4 mm long; bristles yellow
..........6 Perennial, noticeably rhizomatous.
..............8 Panicle 3-8 (10) cm long; plant from knotty rhizomes; [native, common (sometimes weedy)]
..............8 Panicle 5-25 cm long; plant from thick rhizomes; [alien, rare]
........5 Bristles 1-3 (rarely 6) below each spikelet.
................9 Bristles retrorsely scabrous.
..................10 Leaves strigose on the lower surface; sheath margins glabrous; panicles 2-6 cm long
..................10 Leaves scabrous on the lower surface; sheath margins ciliate; panicles 5-15 cm long
................9 Bristles antrorsely scabrous
....................11 Perennial
....................11 Annual.
......................12 Upper lemmas smooth and shiny (occasionally with obscure rugosity)
........................13 Culms to 1 m tall; spikelets ca. 3 mm long; [alien, of ruderal sites]
........................13 Culms to 6 m tall; spikelets ca. 2 mm long; [native, of marshes]
......................12 Upper lemmas distinctly transversely rugose, dull.
..........................14 Upper lemmas coarsely rugose; leaves 4-7 mm wide; [native]
..........................14 Upper lemmas finely rugose; leaves 4-25 mm wide; [aliens, generally of ruderal sites].
............................15 Panicles verticillate; rachises visible, scabrous
............................15 Panicles densely spiciform; rachises not visible, villous.
..............................16 Leaves softly pilose on the upper surface; panicles arching and drooping from the base; spikelets 2.5-3.0 mm long
..............................16 Leaves scabrous on the upper surface; panicles nodding only at the tip; spikelets 1.8-2.2 mm long.
................................17 Panicles 10-20 cm long; culms 10-25 dm tall; leaves 10-25 mm wide
................................17 Panicles 3-8 cm long; culms 2-10 dm tall; leaves 4-12 mm wide