156 GRAMINEAE. 
15. Sporobolus ser6tinus (Torr.) A. Gray. Late-flowering Dropseed 
(Fig. 355.) 
Wr Agrostis serolina Torr. F\. U. S. 1: 88. 1824. 
Ya Za Sporobolus serotinus A. Gray, Man. 577. 1848. 
\ GA Glabrous and smooth or very nearly so, culms 
= 6’-18’ tall, from an annual root, erect, slender, 
<3 simple. Sheaths short, confined to the lower part 
of the culm; ligule less than %’’ in length, irre- 
gularly truncate; leaves %4’’ wide or less, slightly 
scabrous above, flat, the basal one-third to half the 
length of the culm, those of the culm 2/4’ long; 
panicle 3/-9’ in length, the branches capillary, 
erect or ascending, the lower 1/-2!4’ long; spike- 
lets about 5¢’” long, the outer scales subequal, ob- 
tuse, smooth or sometimes sparingly scabrous; 
third scale twice the length of the outer ones, 
\ acuminate. 
In wet sandy soil, Maine to Michigan, south to New 
Jersey. Sept.-Oct. 
16. Sporobolus compréssus (Torr.) Kunth. Flat-stemmed Dropseed. 
- (Fig. 356.) 
Agrostis compressa Torr. Cat. Pl. N. Y. gt. 1819. 
Sporobolus compressus Kunth, Enum. 1: 217. 1833. 
Culms 1°—2° tall, from a horizontal rootstock, stout, 
simple, much compressed, smooth and _ glabrous. 
Sheaths compressed, overlapping, sometimes scabrous 
at the summit; ligule very short; leaves 5’—10’ long, 
1’’ wide or less, folded, slightly rough; panicle 4/—10’ 
in length, the branches erect or ascending, the lower 
2/-3/ long; spikelets about 7’’ long; outer scales sub- 
Een obtuse or somewhat acute, smooth and gla- 
brous; third scale obtuse and apiculate, strongly scab- 
rous, slightly exceeding the outer ones. 
In bogs, Long Island and in the pine barrens of New 
Jersey. Sept.—Oct. 
17. Sporobolus asperifolius (Nees & Meyen) Thurber. Rough-leaved 
Dropseed. (Fig. 357. 5; 
Vilfa asperifolia Nees & Meyen; Trin. Mem. Acad. St. 
Petersb. (VI.) 6:95. 1840. 
Sporobolus asperifolius Thurber; S. Wats. Bot. Cal. 2: 
269. 1880, 
Culms 6/18’ tall, erect from a decumbent and 
branched base, smooth and glabrous. Sheaths short, 
crowded and overlapping, the upper usually enclosing 
the base of the panicle; ligule 1{’’ long, erose-trun- 
cate; leaves numerous, 1/314’ long, 1//—114’’ wide at 
the base, acuminate, strict, often erect, flat, glabrous, 
smooth beneath, very rough above ; panicle 3/-8’ in 
length, included at the base, rarely entirely exserted, 
the capillary branches spreading or ascending, the 
lower 2’—4’ long; spikelets occasionally 2—3-flowered, 
34’ long; outer scales subequal, acute, glabrous, spar- 
ingly scabrous; third scale obtuse or acute, glabrous, 
somewhat exceeding the second. 
Dry soil, Assiniboia to British Columbia, south to Mis- 
souri, Nebraska, California and Mexico. Aug.—Sept. 
