10 
tt Leaves remm pubescent or scabrous, 
to 3 times as long as the flowering glume. 11. ee cinereum. 
$$ eon at least 4 times as long as the flowering glum 
1. Innovations very numerous; culms slender. i S. hystrix, 
2. Innovations few; culms 
a Culm leaves 2-8 em. ue: flat, rigid, obtuse, divaricate. 
8. S. californicum. 
b Culm ~~ 1-2.5 dm. long, flexnous; "yeu g glume 
r n See eet Sate 15. 8. oh gosum. 
oa Mp short, rigid, ascending, 5-10 em. long; 
flowering glume smooth below, scabrous above. 
4. S. montanum, 
d Culm leaves rigid; flowering glume glabrous. 
S. molle. 
*** Empty glumes subulate-setaceous, entire; RUE floret hermaphrodite 
a Culm leaves very long, flexuous, filiform-involu 18. S. longifolium. 
1 Flowering glume 1 em. long, glaucous; culms robust. 17. 8. brevifolium. 
2 Flowering glume 7 mm. long, soft pubescent; culms low. 
1 S. pubiflorum. 
**** Empty glumes lanceolate, 2-5-nerved, entire or eee 
+ Lowest floret longer than the internodes of the ra 
i Leaves flat, glaucous, more strongly end o on geo back than above, 5-8 
2 
HHOI dA iino o uu urs ctu ied Urna an 0, S. planifolium. 
tt Leaves involute, more prominently nerved above E on the back, 2-3 
V S. lanceolatum. 
tt Internodes of the rachis 5 than the lowest floret. 
Que spikelet ab each nodo. 2... irsini 99. S. hanseni. 
2 Two spikelets at each node................ 23. S. anomalum. 
DESCRIPTION OF THE SPECIES. 
$Polyantherix. (Nees,as a genus.) Lowest flowering glume of one or both spikelets 
sterile, awnlike; empty giumes deeply cleft into from 3 to I or more setaceous awns. 
1. SITANION JUBATUM J. G. Smith, sp. nov. 
Culms stout, erect, or ascending, 6 to 9 dm. high, robust, terete, smooth. Nodes 
glabrous. Lower sheaths hirsute, the upper ones minutely pubescent or when 
young vomer edem 5 smooth, much exceeding the internodes, open 
at the thro Ligule cartilaginons, 1 mm. long. Blade narrowly linear-lance- 
olate, 10 we 18 em. long, 3 to 5 mm. wide, rather rigid, flat at the base, involute 
above and on the back toward the base, finely nerved above, with the midnerve 
prominent beneath, Spike 1 to 2 dm. long, often more than m. in diameter 
to the tips of the spreading awns, densely flowered, exserted or the basal portion 
inclosed uppermost leaf sheath. Empty glumes 4, 3- to any-parted from 
about the middle, the lobes setaceous, from 1 to 10 em. long. Spikelets 2 at a 
node, each 2- to 4-flowered, the lowest sterile, the second hermaphrodite, the 
uppermost staminate or sterile, eee giune e linear-lanceolate, acute, 8 to 
10 mm. long, smooth and shining below, 5-nerved from about the middle, sparsely 
scabrous above, trifid at the apex, k lateral lobes setaceous, the mi dle one 
range into a slender, scabrous, subflexuous awn, 8 to 12 em. long. In ter- 
nodes of the rachis 5 to 7 mm. long, compressed or plano-convex, spatulate, 
3 
Type collected by Robert M. Horner, No. 573, Waitsburg, Wash., May 2 7, 1897, 
distributed as “ Elymus sitanion jubatum.” Also collected by Frank W. Hubby; . 
No. 48, among hes im Valley, California, May 7, 1896. 
