601 
GRAM1NEJ2. (GRASS FAMILY.) 
4. B. mollis, L. Panicle erect , close, compound; spikelets 
ovate , jluttish , the flowers closely imbricated, downy (as also the 
leaves, &c.), as long as the awn. ® — Sparingly naturalized in New 
York and Penn. — Darlington dubiously gives B. arvensis, L., in 
fields, Chester county, Pennsylvania. 
5. B. sterilis, L. Panicle very loose , the elongated and nearly 
simple branches drooping; spikelets linear-lanceolate (oblong when 
old), of about 6 rather distant 7-nerved roughish flowers , sh<ntcr than 
the awn ; glumes lance-awl-shaped ; leaves rather hairy. @ — Penn 
Yan, New York, Sartwell. July. 
35. UNIOLA, L. Spike-Grass. 
Spikelets many-flowered, very flat and 2-edged ; one or more of 
the lowest flowers sterile (neutral) and consisting of a single palea. 
Glumes lanceolate, compressed-keeled. Lower palea coriaceo- 
membranaceous, strongly compTessed-keeled, striate-nerved, usu¬ 
ally acute or pointed, entire, inclosing the much smaller compress¬ 
ed 2-keeled upper one and the free laterally flattened smooth grain. 
Stamen 1 (in U. paniculata 3). — Upright perennials, in tufts from 
creeping rootstocks, with broad leaves and large spikelets in a 
panicle. Rachis of the spikelets naked. (Ancient name of some 
Grass, a diminutive of unio , transferred to this genus on account 
of the unity of the lowest paleae.) 
1. U. latifolia, Michx. Spikelets slcnder-pedicelled , drooping , 
in an ample loose panicle , oblong-ovate (P long and ^ or more w r ide), 
10 -15-flowered ; flowers nearly appressed, ovate-lanceolate and taper- 
pointed, slightly scythe-shaped, ciliate on the keel, the lowest one 
neutral and like a third glume ; leaves flat (nearly V wide). — Shaded 
banks, S. Penn., Ohio, and southward. Aug. — Culm 3^-4° high. 
2. U. gracilis, Micbx. Spikelets short-pedicelled {small), in a 
long and slender strict panicle , broadly wedge-shaped, acute at the 
base, 4 - 8-flowered; the flowers at length spreading, ovate, long- 
pointed, the lowest one neutral; leaves long and flat (3' ; -4" wide). 
— Sandy soil, from Long Island southward near the coast. Aug.— 
Culm TP high, slender. 
36. PHBAG11TES, Trin. Reed. 
Spikelets 3 - 7-flowered ; the flowers rather distant, with a con¬ 
spicuous silky-bearded rachis, all perfect and 3-androus, except 
the lowest, which is either neutral or with a single stamen, and 
naked. Glumes membranaceous, shorter than the flowers, lance- 
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