It) 



CONTRIBUTIONS PROM THE NATIONAL HERBARIUM. 



Plants lees densely tofted; leaves flat, g r een , membranaceous. 

 Lemma indurated, not at all keeled. 



Bpikelets 5 to lO-flowered; lemma awnless or rarely Bhort 



awned. 

 Bpikelets 3 to 6-flowered; Lemma awnless 



Glumes Bcarious-margined, much Bhorter than the 

 Lemma; Lemma not acuminate. 

 Lemma acute; Bpikelets Loosely scattered. 

 Lemma obtuse; Bpikelets somewhat aggregated. 

 Glumes without scarious margins, nearly as Long as 

 the Lemma; Lemma acuminate. 

 Bpikelets glaucous, Loosely 4 to 6-flowered; Lemma 



often with a short awn: -heath- smooth. 

 Bpikelets green, closely 2 to 3-flowered; empty 

 glumes scabrous; sheathe short-pubescent 

 Lemma awned, membranaceous, indurated only near the base 

 and keeled at least above the middle. 



Floret Long-stipitate at base; awn terminal. 

 Floret not stipitate at base, 



Lemma plainly 5-nerved; awn from a cleft apex. 

 Bpikelets 5 to 9 nun. Ion*:. 2 to 4-flowered. 



Panicle branches ciliate; awn shorter than 



the Lemma. 

 Panicle branches not ciliate; awn as Long or 

 longer than the lemma. 

 Bpikelets 10 to L5 nun. long, 3 to 7-flowered. 

 Leniina 5-nerved, the intermediate nerve- very ob- 

 scure; awn terminal. 



Awn much shorter than the lemma. 

 Awn as Long as or Longer than the lemma. 



Subgenus Hespebochloa. Perennial-, densely tufted but pro- 

 ducing occasional stout axtravaginal scaly stolons; leaf 1 -lades 



broad, flat, or rarely involute; stamens :>, protruding; stigmas 

 elongate, the numerous short mostly simple branches arising from 

 all side-. 

 A single specie-. 



Subgenus I. Vulpia (Gmel.) Hack. 



of tor. 



biuta. 



25. shnrtii. 



Olttt. 



-7. /"hiisoiii. 



28. snhii/iflorn 



29. dasyclada. 



30. 'hmri. 



31. gigantea. 



32. j'rnl, rrii/ii. 



33. siil, nit, tn. 



34. con tin is. 



Vulpia Gmel. Fl. Bad. 1: 8. 1805, as genus. 



Vulpia Hack, in Engl. A: Prantl, Nat Pflanzenfam. 2*: 75. L887, as subgenus. 



Anneal-; stamens usually only 1, sometimes 3; H< >rets usually remaining unopened, 

 and consequently sell-pollinated; joints of the rachilla usually clavate; stigmas plu- 

 mose, the branches toothed, bilateral. 



Many of the species in this subgenus present slight but remarkably constant differ- 

 ences. In all probability this fact is connected with their close pollination. 



