MANUAL OF THE GRASSES OF THE UNITED STATES 



505 



unequal, the first narrow, nerveless, 

 the second 1-nerved; lemma awn less, 

 3-nerved, the lateral nerves near the 

 margin, the back of the lemma 

 sparingly pubescent between the 

 nerves, the margins densely covered 

 with silky hairs; nerves of the palea 

 densely silky hairy. Annuals or peren- 

 nials, with several short spikes race- 

 mose on a slender axis; our species a 

 low tufted perennial. Type species, 

 Willkommia sarmentosa Hack. Named 

 for H. M. Willkomm. 



1. Willkommia texana Hitchc. 

 (Fig. 738.) Culms erect to spreading, 

 20 to 40 cm. tall; blades flat or more 

 or less involute, short; spikes few to 

 several, 2 to 5 cm. long, somewhat 

 overlapping or the lower distant, 

 appressed, the axis 4 to 15 cm. long; 

 spikelets about 4 mm. long, narrow, 

 acute; first glume about two-thirds 

 as long as the second, obtuse; second 

 glume subacute; lemma about as 

 long as the second glume. % — 

 Spots of hardpan, central and south- 

 ern Texas. A stoloniferous form has 

 been found in Argentina. 



105. SCHEDONNlRDUS Steud. 



Spikelets 1-flowered, sessile and 

 somewhat distant in 2 rows on one 

 side of a slender, continuous 3-angled 

 rachis, appressed to its slightly con- 

 cave sides, the rachilla disarticulating 

 above the glumes, not prolonged; 

 glumes narrow, stiff, somewhat un- 

 equal, acuminate, 1-nerved; lemmas 

 narrow, acuminate, a little longer 

 than the glumes, 3-nerved. Low, 



Figure 738. — Willkommia texana. Plant, X H ; two views of spikelet and floret, X 5. (Tracy 8903, Tex.) 



