Flora of the Southeastern United States
2022 Edition

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Key A: Paspalum setaceum complex
(by Richard J. LeBlond)

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1 Blades glabrous to pubescent or sparsely pilose (the margins often ciliate and/or scabrous).
..2 Blades glabrous, crowded toward the base, often recurved, 3-10 mm wide; rachis of panicle branches 0.2-0.6 mm wide; spikelets 1.4-1.8 mm long, 0.9-1.3 mm wide, glabrous (-few glandular hairs); sterile lemma without a midvein
..2 Blades glabrous, sometimes pubescent or sparsely pilose, more strongly cauline, not recurved (though sometimes spreading), 3-18 mm wide; rachis of panicle branches 0.6-1.2 mm wide; spikelets 1.7-2.6 mm long, 1.2-2.1 mm wide, pubescent to glabrous; sterile lemma with or without a midvein.
....3 Blades conspicuously rigid, 2.5-6 (-8) mm wide; spikelets 2.0-2.6 mm long, 1.5-1.8 mm wide
....3 Blades lax to firm (if firm, then more than 6 mm wide); spikelets 1.7-2.4 mm long, 1.2-2.1 mm wide.
......4 Sterile lemma with a midvein; blades dark green to purple; spikelets elliptic to obovate, 1.7-2.0 mm long, 1.2-1.5 mm wide
......4 Sterile lemma without a midvein; blades yellow-green to dark green; spikelets obovate to suborbicular, 1.7-2.4 mm long, 1.5-2.1 mm wide
1 Blades densely pubescent, hirsute, or long pilose.
........5 Blades crowded toward the base, recurved; spikelets 1.4-1.9 mm long, often purple-spotted
........5 Blades more strongly cauline, not recurved (though sometimes spreading); spikelets 1.4-2.5 mm long, not purple-spotted.
..........6 Plants prostrate to widely spreading; rachis of panicle branches 0.6-1.5 mm wide.
............7 Blades 3-8 mm wide, grayish green, densely pubescent with hairs < 1.5 mm; panicle branches 3-6 cm long, rachis 0.7-1.0 mm wide; spikelets 1.8-2.2 mm long, 1.6-1.8 mm wide, suborbicular to orbicular, pubescent; sterile lemma without a midvein
............7 Blades 2-19 mm wide, yellow-green, pilose with hairs 1.5-4 mm long; panicle branches 2-10 cm long, rachis 0.6-1.5 mm wide; spikelets 1.7-2.1 mm long, 1.2-1.6 mm wide, elliptic to obovate (-suborbicular), glabrous or pubescent; sterile lemma with or without a midvein
..........6 Plants erect to spreading; rachis of panicle branches 0.3-1.0 mm wide.
..............8 Spikelets 1.4-1.9 mm long, 1.1-1.6 mm wide; sterile lemma without a midvein; blades grayish green, 1.5-7 mm wide
..............8 Spikelets 1.7-2.5 mm long, 1.5-2.1 mm wide; sterile lemma with or without a midvein; blades light green or yellow-green to dark green, 2-16 mm wide.
................9 Sterile lemma usually with a midvein; blades 2-10 mm wide, hirsute with hairs to 5.5 mm long, light to dark green; spikelets glabrous to sparsely pubescent
................9 Sterile lemma without a midvein; blades 2-16 mm wide, pubescent with hairs < 1.5 mm long to glabrous, yellow-green to dark green; spikelets pubescent to glabrous