10 



tJ Leaves dorsally i»nl>o8ceiit or scabrous. 



V\ Awn 2 to 3 times as long ns the flowering glniue. 11. S. cinereum. 

 H Awn iit It'ust 4 times .Is long as the flowering glume. 



1. TunovatiouB very numerous; culms slender. 12. S.hystrix. 



2. Innovations few ; culms robust. 



(( Culm leaves 2-8 cm. long; flat, rigid, obtuse, divaricate. 



8. S. caUfornieum, 

 /-Culm kaves 1-2.5 dm. long, flexuous; flowering glume 



scabrous 15. S. atrifiosiim. 



rCulm leaves short, rigid, ascending, 5-10 cm. long; 

 flowering glume smooth below, scabrous above. 



14. N. montaniim, 

 </Culm leav«-s rigid; flowering glume glabrous. 



16. S. moUe. 

 •"•* Empty glumes subulate-setaceous, entire; lowest floret hermaphrodite. 



a Culm leaves very long, flexuous, filiform-involute 18. S. lo)igifoUum. 



fcCulm leaves short, rigid, spreading, or horizontally divaricate. 



1 Flowering glume 1 cm. long, glaucous; culms robust. 17. S. hrevifoUum. 



2 Flowering glume 7 mm. long, soft pubescent; culms low. 



• 19. S. pubitforum. 



**** Empty glumes lanceolate, 2-5-nerved, entire or lobed. 

 t Lowest floret longer than the internodcs of the rachis. 



t Leaves flat, glaucous, more strongly nerved on the back than above, 5-8 



mm. wide 20, S. planifoliiim. 



i t Leaves involute, more prominently nerved above than on the back, 2-3 



mm. wide 21. jS. Janceolatum. 



1 1 Internodes of the racliis longer than the lowest floret. 



1 One si)ikelet at each node. 22. S. han>^nn. 



2 Two spikclets at each node 2S. N. anomalum. 



DESCRIPTION OV THE SPECIES, 



^ Polyantherix. (Nees, as a genus.) Lowest flouieruxj f/liime of one or both spikeUts 

 Hterile, airnlilce; emptij (jliums deeply cleft into from .; to U or more setaceoux awnn. 



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 sparsely hirsute, becoming smooth, much exceeding the internodes, open 

 at the throat. Ligule cartilaginous, 1 mm. long. lUadc narrowly linear-lance- 

 olate, 10 to 18 cm. long, 3 to 5 nun. wide, rather rigid, Hat at the base, involute 

 toward the acuminate apex, strigose-puboscent throughout, sparsely hirsute 

 above and ou the ba(dc toward the base, iinely nerved above, with the midnerve 

 ]in)minent beneath. Sjiike 1 to 2 dm. long, often nuirc than 1.5 dm. in diameter 

 to the tips of the spreading awns, densely flowered, exserted or the basal portion 

 inclosed in the uppermost leaf sheath. Empty glumes 4, 3- to mauy-parted from 

 about the middle, the lobes setaceous, IVom 1 to 10 cm. long. S])ikclets 2 at a 

 node, each 2- to 4-flowered, the lowest sterile, the second hermaphrodite, the 

 upitermost staminate or sterile. Flowering glunu' linear-lanceolate, acute, 8 to 

 1(1 mm. long, smooth and shining below, 5-nerved I'rom about the middle, sparsely 

 HcaliroMs above, trilid at the apex, the lateral lobes setaceous, the middle one 

 jirolonged into a slender, scabrous, subllexuous awn, 8 to 12 cm. long. Inter- 

 nodes of the ra<'liis 5 to 7 mm. long, compressed or plano-convex, spatulate, 

 g]:ibr<uis. 



Type (oHcctcd by K'obert .M. Homer. No. 57:^, Waitsburg, Wash.. May 27. 1897, 

 ilistribiited as " FAymuK ailanion Jiibaliim.'' Also collected by Iraiik \V. Hubby, 

 No. 48, among rocks, O.jai Valley, California, May 7. 189t>. 



