388 



POACE.E. 



more properly) is muoli roducod. llerbiirium spociiiiens from Eu- 

 rope, when dry, sliow ;{ corriH, in ull '-i.5-3 cm. lon^f, 1-1.5 cm. 

 wick'. 



HO. (104). Tristachya Neea. A^'rost. Brus. 458. (1829). Mum- 

 j)(>;/o/i Presl. Ucl. llu'iik. 1 : :J24 (KS;30). 



Spikeli'ts '.'-llowered, collected in threes, sessile or raised on 

 short subeciuid pcclicels at the enils of the branches of the panicles; 

 ra(.'hilla iiairy, not extending above the upper flower, the lower ouo 

 mall', the upi)er perfect or female. Km|»tv <;himes !i, slightly un- 

 e<iual, persistent, membranous, awnless, glabrous or the outer cili- 

 ate, lloral glunu' of the lower spikelet membranous, awidess, that of 

 the upper bilid Ijearing a long twisted awn i)etween the teeth of the 

 apex; paU's' enclosed by the tloral glume, membranous. 2-nerved. 

 Lodicules 2. Stamens ",* or 3. Styles distinist, very slender. (Jraiu 

 oblong or linear, enclosed, but TU)t adherent. 



Perennials or rarely annuals, usually 11 rm, ])ladcs Hat or convo- 

 lute. I'anicle loose, spikelets few and 

 large, erect or nodding or smaller and 



more numerous. 



'IM 



There are eight species, two American; 

 the others are found in tro])ical Africa, 

 Australia, or western Asia. 



Here the lower flower is staminate as 

 in Arrheiiatherum; spikelets always 3 to- 

 gether, sessile or e(|ually i)ediccllate. the 

 long twisted awn of the floral glume ter- 

 minal and between two lobes or the awns 

 straight. 



1. T. leiostachya Nees. Agrost. liras. 



45!» (18'^'9). T. Mej-irann Knnth, Enum. 

 Fig. 67. — Tristnchya Mexi- ,„ , ono /io'>'}\ m 

 eana. A. spikdet; a, ' 1- 1 = ^08 (183.i). Moiiopof/on iu'enareiis 



floret, (llichuidsou.) pj.Q^\^ ll^^l Ha3nk. 1 : 3-,»5, /. 44 (1830). 



An erect glabrous perennial, 30-40 cm. high. Leaf-blades 



flat, 5 mm. wide, the upper blade 8 cm. long. Panicle simple, 



narrow, 20 cm. long. Emi)ty glumes with three prominent nerves, 



tips scarious, first 2.5 cm. long, second 3 cm. long, 3 mm. wide; 



