84 PANIC'ACE.E. 



e. Spikes more than one to the culm (f) 



f. Spikes 1-2 cm. long 11 



f. Spikes ;»-4 cm. long, var. oi J*, inops. . . 11 



f. Spikes longer (g) 



g. Spikelets 1.7 mm. long, spikes 4-15 cm. 



long 12 



g. Spikelets longer (li) 



h. Kacliis more or less pubescent. ... 13 



h. Perhaps some plants ot number. . . 17 



h. Kachis glabrous (i) 



i. Spikes 3-5, s])ikelet8 about 2 mm. 



long 14 



i. Si)ikes 5-8, spikelets 2-2.3 mm. 



long 15 



1. Spikes 3-7, spikelets 3 mm. long. . 10 

 i. Spikes mostly single, sjiikelets 2.2 



mm. long 17 



a. Rachis not enclosing the spikelets. usually 1 mm. or 



more wide (j) 



j. Si)ikelets more or less hairy or puberulent (k) 



k. Spikelets narrowly elli|)tical. acute, ciliate on the 



margins, 3.3 mm. long 18 



k. Spikelets oval, acute, 3-4 mm. long IJ) 



k. Spikelets oval, obtuse; spikes 3-G 20 



j. Spikelets glabrous (m) 



m. Spikes 2 (sometimes 1),S-10 cm. long ; spikelets 



oval, 2.5-3 mm. long 21 



m. Spikes more than 2 to the culm (n) 



n. Rachis 2 or nearly 2 mm. wide ; sj)ikelets 



2-2.3 mm. long 22 



n. Rachis rarely 2 mm. wide in some plant.s of 



number 23 



n. Ihichis 2 mm. wide; si)ikelets 2.5 mm. long. . 24 



n. Kachis 2 mm. wide; spikelets 3 mm. long. . 25 



n. Rachis narrower (p) 



p. Spikelets subacute, 'i.5-3 mm. long: rachis 



