POACEAE 127 
florets; glumes unequal, acute, shorter than the lemmas, the first 1-nerved, the 
second 3- to 5- nerved; lemmas chartaceous, pointed, 3-nerved, the nerves con- 
verging in the point, the TE floret re- 
duced; palea chartaceous, obtuse, at ma- 
turity the lemma and palea dcs Spread 
by the large turgid beaked caryopsis with 
hard shining pericarp.—Two species, the fol- 
lowing, and one in Asia. 
zt D. festucoides Raf. is d hore 
.t n: leaves nearly as stem, 
g er wide: panicle ae simple, 10—25 
m n: ao 10-15 mm. long, the pedi- 
pem shor Dia incl rica Bea 
Koryc "us diandrus Kun zo] -Rich w woo de, 
Interior dd PS tea We and pre Lowland, 
Tenn. to 3 Sw D 
88. UNIOLA L. Rather tall erect perennials with flat or sometimes invo- 
lute blades and narrow open panicles of compressed sometimes very broad 
fiat spikelets. Spikelets p to many-flowered, the lower 1 to 4 lemmas empty, 
a 
mucronate; lemmas compressed, sometimes conspicuously flattened, chartaceous, 
many-nerved, the nerves join S obscure, usually acute or Vii the 
empty ones at the base usua gis successi B maller, the uppermost reduced; 
palea rigid, sometimes bowed-out on the winged keels.—Nine specie, North 
American.—SPIKE-GRASSES. SPANGLE-GRASSES. 
Panicle droopin 
Leaf-blades broad flat. I. LATIFOLIAE. 
Leaf-blades narrow, involute. II. PANICULATAE. 
Panicle erect, contr acted or somewhat open. III. LAXAE. 
I. LATIFOLIAE 
Slender wood-grass with flat blades and very flat many-flow- 
ered green spikelets. 1. U. latifolia. 
II. PANICULATAE 
Stout dune-grass with a heavy rather dense panicle and many- 
flowered stramineous spikele ets. 2. U. paniculata. 
III. LAXAE 
Spikelets not over 7 mm. wide: leaf-blades and panicles elon- 
ate. 
Collar and usually sheaths diens pubescent. 9. U. longifolia. 
Collar and sheaths glabrou 4. U. taxa.. 
Spikelets 1 cm. or more wide: T blades not elongate. 
Panicle not over 10 em. long: spikelets crowd 5. U. ornithoryncha. 
Panicle usually 10-20 cm. long: spikelets not crowded. 6. U. nitida. 
1. U. latifolia ro Stem 60-150 cm. tall, leaf-blades commonly 15 mm. 
wide: erage 10-25 em. long, Ari i the Se t e bearing a few 
broad fi t spikelets as much a m. long: . long.— PX d 
slopes and stream banks various Merle ma s ‘Tex, "Kane, and Mas 
