Lycurus

Kunth
Treatment appears in FNA Volume 25. Treatment on page 200.

Plants perennial; cespitose. Culms 10-60 cm, erect to somewhat decumbent, usually branched. Sheaths open, compressed-keeled, glabrous, smooth or scabridulous, mostly shorter than the internodes, a 2-veined prophyllum often present; ligules hyaline, strongly decurrent, truncate or rounded to elongate and acuminate, sometimes with narrow triangular lobes extending from the edges of the sheath on either side; blades folded or flat, rather stiff, with prominent, firm, scabrous margins, midveins sometimes extending as short mucros or fragile, scabrous, awnlike apices. Inflorescences terminal and axillary, dense, bristly, spikelike panicles; branches short, fused to the rachis, terminating in a pair of unequally pedicellate spikelets or a pedicellate spikelet and a short secondary branch bearing two spikelets, occasionally in a solitary spikelet, usually the lower spikelet in a pair staminate or sterile and the upper spikelet bisexual, sometimes vice versa, or both spikelets bisexual; disarticulation at the fused base of the pedicels or pedicel and branch, paired spikelets falling as a unit, leaving a cuplike tip. Spikelets with 1 floret. Glumes subequal, awned; lower glumes with (1) 2 (3) awns, usually unequal, awns commonly longer than the body; upper glumes 1-veined, with a single flexuous awn that usually longer than the glume body, rarely a finer second awn present; lemmas lanceolate, 3-veined, pubescent on the margins, mostly glabrous over the back, tapering to a scabrous awn that usually shorter than the lemma body; paleas about equal to the lemmas, acute or occasionally the 2 veins extending as very short mucros, pubescent between the veins and on the sides, except for the narrow, glabrous, hyaline margins; anthers 3. Caryopses fusiform, brownish, x = 10.

Distribution

Maine, Colo., N.Mex., Tex., Utah, Calif., Kans., Ariz., Okla.

Discussion

Lycurus is a genus of three species of open rocky slopes and mesas. It is native to two disjunct regions, one extending from Colorado and southern Utah to southern Mexico and Guatemala, the other from Colombia through western South America to west-central Argentina. Two species are native to the Flora region. They can only be reliably distinguished by their vegetative characters.

Key

1 Upper leaves terminating in a fragile, awnlike tip (3)4-7(12) mm long; ligules (2)3-10(12) mm long, elongate, acute or acuminate, sometimes with a small cleft on either side; culms erect Lycurus setosus
1 Upper leaves acute or with a mucro or bristle 1-3 mm long; ligules 1.5-3 mm long, with evident narrow triangular lobes 1.5-3(4)mm long on the sides; culms erect to ascending, often geniculate Lycurus phleoides

"decumbent" is not a number.

... more about "Lycurus"
Charlotte G. Reeder +
3 (?) +  and 1 (?) +
flexuous +
usually longer +  and commonly longer +
single +  and 2 +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
membranous +
not pseudopetiolate +
pubescent +  and glabrous +
flat +  and folded +
spikelike +
triangular +  and dome--shaped +
sometimes longer +
membranous +
erect to somewhat +
10 cm100 mm <br />0.1 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not woody +
Maine +, Colo. +, N.Mex. +, Tex. +, Utah +, Calif. +, Kans. +, Ariz. +  and Okla. +
not waisted +
capillary +
pistillate +  and staminate +
sometimes longer +
bisexual +  and fertile +
round +  and compressed +
reduced +
shorter or longer +
subtending +
subequal +
uncinate +
paniculate +  and racemose +
hollow +  and solid +
not absent +
glabrous +  and pubescent +
tapering +  and lanceolate +
sometimes longer +
acuminate +, rounded +  and elongate +
triangular +
inconspicuous +
concealed +  and prominent +
2 +  and 1 +
occasionally +  and acute +
spikelike +
dry +  and fleshy +
spikelike +
reeder1985a +  and sanchez1986a +
scabridulous +  and smooth +
compressed-keeled +
compressed +
1 (?) +  and 3 (?) +
compound +  and simple +
2 (?) +  and 3 (?) +
Gramineae +
Lycurus +
Poaceae tribe Cynodonteae +
cuplike +
membranous +
7 +  and 13 +
plant +  and cespitose +
aquatic +  and terrestrial +
dioecious +, monoecious +  and synoecious +