53 
equaling the lower; stamens 3; anthers mncronulate at apex (but not barbulate 
as described by Trin. & Rupr.). Stipacese 76; Watson, Bot. King Exped., 380; 8. 
juncea Nutt. Gen., 1, 58, not Linn.; 8. eapillata HWouk. Flor, Bor. Amer. 11, 237, not 
Linn. 8S. occidentalis Bolander, Proc. Calif, Acad. 1Vv, 169, in part.”— Rocky Mountains 
to British Arnerica. 
12. S. spartea Trin. (PORCUPINE GRASS). (Gray’s Manual, 6th ed., p. 641.) Culms 
rather stout, 14 to 3 feet high, simple, erect ; sheaths longer than internode, ligule 
very short, obtuse; radical leaves 1 to 2 feet long, involute, pointed, those of the 
culm complanate or involute, 6 inches long; panicle contracted, 4 to 6 inches long, 
lower branches in twos, erect, rather few-tlowered ; spikelets large, on pedicels as 
long or shorter; empty glumes 12 to 18 lines long, lanceolate, subulate-pointed ; flower- 
ing glume 8 to 10 lines long, including the 3 lines long, obconic, sharp-pointed stipe, 
brown when mature, sparsely pubescent, with a few short hairs at the crown; awn 
stiff, twisted, twice bent above, 3 to 6 inches long.—Plains and prairies, Missouri, 
Iowa, Kansas and northward. 
13. S. pennata Linn. Var. Neo Mexicana Thurb. (Coult. Rocky Mt. FL, p. 
408.) Culms tufted, 2 to 3 feet high; radical leaves half to two-thirds as long as the 
culm, filiform-convolute, smooth, those of the culm short, sheaths striate, equaling 
or longer than the internodes; panicle about 6 inches long, close, nodding, the 
branches erect, the lower in twos, with few large spikelets; empty glumes 14 inches 
long, equal, with long, setaceous points, 7- to 9-nerved; flowering glume 7 to 8 lines 
long, including the obeonic, brown, sharp-pointed, 3 lines long, stipe ; sparsely hairy 
in lines, contracted below the cup-like apex; awn about 6 inches long, flexuous, 
twice bent, pubescent or plumose to the apex, with white hairs. —Texas, New Mex- 
ico and Arizona, ; 
14. S. leucotricha Trin. & Rupr. Gram. Agrost, p. 54. Culms 1 to 2 feet 
high, nodes downwardly barbed with white hairs, sheaths commonly shorter than 
the internodes; leaves about 6 inches long, linear-convolute, filiform; panicle 3 to 4 
inches long, generally included at base by the upper sheath, becoming exserted, 
sparsely-flowered ; the lower branches in twos, unequal, erect ; outer glumes acumi- 
nate, subequal, 6 to 7 lines long, }-nerved, pale-green or colored, awn-pointed ; flow- 
ering glume 4 to 5 lines long, including the stipe (white-hairy), as also the lower 
part of the glume, the upper part papillose-scabrous, somewhat contracted below 
the apex or corona, with a fringe of white hairs; awn 24 to 3 inches long, twisted 
and geniculate. —Texas and New Mexico, 
This is quite distinct from S. setigera. 
15. S. setigera Pres]. (Bot. Cal. 1. p. 286.) ‘Culm 1 to 3 feet high, pubes- 
cent at the rodes, with radical leaves about one-third as high; culm leaves flat, 2 or 3 
lines wide below, long-attenuated above, rough-pubescent and sometimes ciliate 
on the margins, the uppermost nearly equaling the panicle; ligule about 1 line 
long, truncate and split; sheaths two, pilose at throat, the lower shorter than the in- 
ternode, the upper loose; panicle about 6 (sometimes 12) inches long, mostly included 
below, loose, flexuous, more or less secund when young, the slender rays in pairs ; 
pedicels shorter than the spikelets; glumes 6 to 9 lines long, long-acuminate, the 
upper rather shorter, usually purplish, strongly 3-nerved ; floret (including a callus 
of 1 line) 5 lines long, constricted below a distinet corona; lower palet tubercular- 
roughened, silky-hairy especially on the nerves; upper palet hyaline, scarcely a third 
as long; awa 2 to 8 inches long, slender, flexuous, more or less distinctly bent above 
the middle, strongly pubescent below, minutely so above, persistent; anthers bearded 
at the apex.”—California, 
16. S.eminens Cav. (Bot. Cal. u. p, 286.) ‘Culms 1 to 3 feet high, slender, 
pubescent at the nodes; leaves convolute-setaceous, somewhat rigid, slightly sea- 
brous, those of the radical tufts about half as long as the culm; lower culm 
leaves 6 to 8, the uppermost 2 inches long; ligule very minute; sheaths striate, 
smooth; panicle 4 to 6 inches long, soon exserted, somewhat secund, the very slender 
