PLANTS COLLECTED BY DR. GAMBEL. 189 



*STENOCHLOA. 



Spikelets about three-flowered ; flowers distichal, hermaphrodite. Glumes two, 

 awnless, lanceolate, acute, much exceeding- the spikelet in length Paleae two, 

 awnless, the lower concave, ovate, nearly nerveless and pubescent ; the upper 

 bicarinate. Stamina three. Ovarium stipitate. Styles two. Stigmas plumose. 

 Caryopsis free, oblong-lanceolate. 



S. *'CALiFORNicA. A smooth, many-jointed, annual, small grass, without branches, about a foot high ; leaves 

 linear and attenuated into long points ; ligules membranaceous, small ; panicle narrow with the small 

 branches appressed. Glume green, and smooth, very long, extending beyond the included spikelet ; 

 the lower valve lanceolate-linear, very acute, membranaceous on the margin, obscurely three-nerved ; 

 the upper narrower, one-nerved ; paleae ovate, obtuse, the lower silky pubescent, nearly nerveless, the 

 upper with a nerve on either margin ; anthers whitish. 



Nearly allied to Poa, but with the glume almost of Danthonia ; the palea also 

 nerveless, not carinate, and without the arachnoid connecting pubescence at the base. 

 Hab. Island of Santa Catalina. Coast of California. 



*PLEOPOGON. 



Spikelets one-flowered. Glumes two, unequal, nearly as long as the flower ; the 

 lower with two awns, the upper entire, with one awn. Paless two, the lower oblong, 

 with the apex produced into a short awn, the upper without awn, and two-nerved. 

 Stamens three. Styles two. Stigmas pilose, slender. Culm compressed, somewhat 

 branched ; leaves linear, short and rigid ; spikes terminal, simple, not jointed. 



P. *sETosuM. Leaves very narrow and acuminated, rather rigid ; ligules membranaceous, acuminated ; 

 glumes somewhat membranaceous, the lower terminating with two longish scabrous awns, often rather 

 unequal in length, the upper not cleft, terminating with a single awn ; the lower palese rather 

 lanceolate, purplish and somewhat oblique, entire, terminating in a shortish twisted awn ; a line of 

 pubescence along the sides of the glume ; the upper glume membranaceous, two-nerved. 



A slender grass, about eighteen inches high, with a flattish jointed culm. Allied 

 apparently to Lycurus, but the flowers are all hermaphrodite. 

 Hab. Mountains of Santa Fe, Mexico. 



