Millet Tribe 23 



nearly sessile in 2 rows ; outer glumes 3-5-nerved, slightly ex- 

 ceeding the acute third one, which is sparingly hearded at the 

 apex. 



Frequent along streams and irrigating ditches. Los Angeles; Santa Ana. 



4. SYNTHERISMA Walt. Crab-grass. 



Annual grasses with flat Leaves. Spikelets borne in 

 pairs or in 3's in secund spikes which are digitate or 

 approximate at the summit of the culm. (Humes 4 or 3, 

 the innermost one chartaceous, subtending a palea of 

 similar texture and a perfect flower. Stamens 3. Stig- 

 mas plumose. 



1. S. sang-uinalis (L.) Pulac. Culms erect or decumbent, 

 often rooting at the lower nodes, 3-9 dm. long, smooth; sheaths 

 glabrous or pubescent; leaves 5-15 cm. long, 4-8 mm. wide, 

 acuminate, glabrous or pubescent; spikes 3-10, narrowly linear, 

 4-15 cm. long, digitate at the summit of the culms; rachis flat, 

 winged; spikelets 2.5-3 mm. long, in pairs, 1 sessile or nearly 

 so, lanceolate; first glume minute, second a half to a third as long 

 as the spikelet. (Panicum sanguinale L.) 



Common along irrigating ditches and in neglected orchards and gardens. 



5. PANICUM L. Panic-grass. 



Annual or perennial grasses, varying greatly in habit 

 and inflorescence. Spikelets 1-2-flowered, when 2-flow- 

 ered the lower one staminate only. Glumes 4, the 3 

 lower membranous, empty or the third with a staminate 

 flower ; the fourth chartaceous shining, enclosing a 

 palea of similar texture and a perfect flower. Awns 

 commonly wanting. Stamens 3. Styles distinct ; stig- 

 mas plumose. Grain free, enclosed in the hardened 

 fruiting glume and palea. 



* Anns present. 



1. P. Crus-galli L. Culms 3-8 dm. high, usually branching 

 at base; sheaths smooth; leaves 1-5 dm. long, 3-12 mm. wide, 

 smooth or scabrous; panicle composed of 5-15 sessile mostly 



