(301) 



2. A. VERTiciLLATA Vill. G 1 u m e s nearly 

 equal; upper palet nearly as long as the lower. 

 71. San Francisco. Summer. 



3. A. EXARATA Trin. Glumes nearly equal; 

 upper palet minute, about the length of the 

 ovary; lower palet 5-nervecl and marked on the 

 back by a longitudinal furrow. — U . San Fran- 

 cisco. Summer. 



4. A. SCABRA Willd. Glumes unequal, the 

 lower longer, acute and scabrous; upper palet 

 very minute, sometimes 0. — 0. San Francisc- 

 co. Spring. 



10. Gastridium Pal. 



Spikelets 1-fiowered. Glumes 2, ventricose 

 at the base, much larger than the flower and 

 closed. Palets 2; the inferior sometimes aris- 

 ta te, embracing the superior 2-carinate one. — 

 0. Leaves flattened. Panicles contracted, 

 spikelike. 



1. G. AUSTRALE Beauv. — San Francisco. 

 Spring. 



11. Stipa L. Feather-Grass. 



Spikelets 1-flowered, flowers stipitate. 

 Glumes 2, membranaceous, larger than the flow- 

 er. P a 1 e t s 2, involute, superior shorter, 2- 

 nerved; inferior aristate, with a simple twisted 

 awn. Ovary stipitate; caryopsis terete, and 

 closely wrapt in the palets. — U- Spikelets pe- 

 dicillate, paniculate. 



