85 
on the angles; sheaths longer than internodes; panicle at first close, becoming open 
and pyramidal, or widely spreading, 6 inches to 2 feet long, the rays smooth, 3 to 6 
inches long, scattered on the axis, naked below; empty glumes lanceolate, 3 to 4 lines 
long, the lower } to } shorter; floral glume equaling or little shorter than the upper 
glume, the hairs of the callus copious, 4 to % as long as the glume.—Lake shores, 
Illinois, and Michigan westward throughout the plains from British America to Utah 
and Arizona, 
30. C. brevipilis Gray. (Gray’s Manual, 6th ed., p. 651.) (Ammophila brevipilis 
Benth.) Culms 2 to 4 feet high, from strong, scaly rootstocks, smooth ; leaves at base 
crowded and strongly conduplicate, those of the culm narrow, with long filiform 
points; panicle purplish, open, spreading, 5 to 8 inches long, flowering above the 
middle; empty glumes unequal, ovate to oblong, acute, the upper 2 lines long, the 
lower about half as long, with a few short hairs external of the base ; floral glumes 
equal, 2 lines long, sparsely hairy on the back and keels, hairs of the callus sparse, 
one-third as long as the glume; palet equaling its glume, sparsely pubescent.— 
Rare: Sandy swamps, pine barrens of New Jersey. 
31. C. Curtissii Vasey. (Bull. Torr. Club, x1. p. 7, as Ammophila Curtissii.) Culms 
3 to6 feet high, from a stout creeping rhizoma, growing singly or in small tufts, the base 
clothed with the rigid, imbricated 2-ranked sheaths, the culm above with 3 or 4 dis- 
tant leaves, involute, setaceous, 4 to 10 inches long; the ligule an obscure ciliate 
ring; panicle 8 to 10 inches long, narrow and strict, the rays appressed, very numer- 
ous, scattering or in twos below, loosely flowered, subdivided nearly to the base; 
spikelets short-pediceled, about 24 lines long; the empty glumes unequal, linear- 
lanceolate, the lower 3 to } shorter than the upper; floral glume equaling the spikelet 
or longer, linear-lanceolate, sparsely hairy externally, the basal hairs few and very 
short; palet narrow, one-third shorter than its glume.—Indian River, Florida (No. 
3412 Curtiss). 
Several other species of this genus have been described or indicated by the author, 
but on insufficient material, and are therefore omitted. Among these are Deyeuxia 
breviaristata Torr. Bull. xv. p. 48, D. borealis, Macoun, and D. Columbiana, 
Macoun. 
AMMOPHILA Host. 
Spikelets 1-flowered, in a contracted spike-like or an open, diffuse 
panicle, with or without a bristle-like rudiment opposite the palet; 
outer glumes large, nearly equal, rigid, thick, lanceolate, acute, keeled, 
5-nerved; flowering glume similar in texture, about equal in length, 
sometimes mucronate at the apex; palet as long as its glume, of sim- 
ilar texture, 2-keeled, sulcate between the keels; hairs at the base of the 
flower usually scanty and short. 
1. A.arundinacea Host. (Gray’s Manual, 6thed., p. 651.) (Psamma Beauv.) Culms 
densely tufted, from firm-running rootstocks, about 2 to 3 feet high; leaves 10 to 18 
inches long, rigid, becomirg involute; panicle spike-like, dense, 5 to 10 inches long, 
cylindrical; spikelets, 5 to 6 lines long; empty glumes lance-linear, scabrous on the 
keels, floral glume and palet about equaling the empty ones; hairs of callus and 
rudiment scanty, about + as long as the floral glume.—Seacoast New England to 
Virginia and on the Great Lakes; also San Francisco, Cal. (J. G. Lemmon.) 
HELEOCHLOA Host. 
Spikelets 1-flowered, crowded in a dense spike or spike-like panicle. 
Lower glumes persistent, membranaceous, acute, ciliate-carinate, awn- 
less; flowering glume similar, a little longer, and a little exceeding the 
palet. Stamens 3. 
