220 MISC. PUBLICATION 200, U. S. DEPT. OP AGRICULTURE 



34. ORCTJTTIA Vasey 



Spikelets several-flowered, the upper florets reduced; rachilla 

 persistent, continuous, the florets falling away, or tardily disarticu- 



Figuee 429.— Anthochloa colusana. Plant, X l A; spikelet and floret, X 5. (Type.) 



lating; glumes nearly equal, shorter than the lemmas, broad, irregu- 

 larly 2- to 5-toothed, many-nerved, the nerves extend- 

 ing into the teeth; lemmas firm, prominently 13- to 15- 

 nerved, the broad summit toothed; palea broad, as long 

 as the lemma. Low tufted annuals, with short blades 

 and solitary spikes or spikelike racemes, the subsessile 

 spikelets relatively large, the upper aggregate, the lower 

 more or less remote. Type species, Orcuttia caltfornica. 

 Named for C. R. Orcutt. 



Lemmas with 7 to 11 short teeth 1. O. greenei. 



Lemmas with 5 awn-tipped teeth. 



Blades filiform, glabrous 2. O. tenuis. 



Blades flat, 1.5 to 3 mm wide, pilose 3. O. californica. 



1. Orcuttia greenei Vasey. (Fig. 430.) Culms 15 

 to 20 cm tall, suberect; blades 2 to 3 cm long, sub- 

 involute; raceme 3 to 7 cm long, pale; spikelets 10 to 

 15 mm long, loosely papillose-pilose; glumes 4 to 5 mm 

 long; lemmas 6 mm long, the obtuse or truncate tip 

 spreading, 7- to 11-toothed, the teeth mucronate but 

 not awned. © — Known only from moist plains of 

 the upper Sacramento near Chico, Calif. 

 2. Orcuttia tenuis Hitchc. (Fig. 431.) Culms in small tufts, 

 slender, erect, 5 to 12 cm tall; leaves mostly basal, the blades firm, 



Figure 430- 

 Orcuttia greenei 

 Spikelet, X 5 

 (Type.) 



