ZOYSIEiE. 78 



Arizona, Lemmon ; Mexico (State of Jalisco), Palmer 479. 



Var. abortivus Fonrn. Mex. PI. Euum. Gram. 71 (1886). Awn 

 of floral glume very short, scarcely above the obtuse lobes. Mexico, 

 Pringle 1408. 



Var. unisetus (E. & S.) Fourn. I.e. jTJ. unisetus R. & S. Syst. 

 2 : 805 (1817). The central awn of floral glume of the fertile spikclet 

 projecting 6 mm., the lateral awns less than 1 mm. long. 



Mexico, Pringle 1407. 



3. m. gracilis Vasey, Bull. Torr. Club, 13:230 (1886). Per- 

 ennial; often tinged with red. Culms tufted, erect, slender, smooth, 

 sparingly branched. 30-40 cm. high. Sheaths two-thirds as long as 

 the interuodes; ligule 1-2 mm. long; blades flat, thin, 1-3-5 cm. 

 long, 1 mm. wide. Panicle racemose, 3-6 cm. long, the axis bear- 

 ing 10-12 secund clusters of spikelets, the clusters consisting of 1 

 sessile and 2 short, pedicellate spikelets. Spikelets 2-3-4 mm. 

 long, first and second glumes linear, acutely 3-lobed, 1 mm. long, 

 the middle lobe extending into an awn, 1 mm. long; floral glume 

 oblong, 3-nerved, 2 mm. long, 3-awned, lateral awns 2 mm. long, 

 the central twice as long; palea oblong, shortly 2-toothed. Anthers 

 0.8 mm. long. 



Mexico, Palmer 28, 247, 505 and Pringle 823. 



18. (65). NAZIAAdans. Fam. PI. 2:31 (1763). Tragus TLoW. 

 Hist. Stirp. Helv. 2:203 (1768). Lappago Schreb. Gen. 55 (1789). 

 Spikelets 1-flowered, mostly in clusters of 2-5, at length deciduous 

 by a joint, the terminal one often sessile, the others including a 

 perfect flower, the clusters having very short pedicels on the rachis 

 of the spike. Glumes 2-3, the lower minute, often absent, the 

 second empty, stifl', its nerves covered with strong, hooked prickles; 

 the terminal floral 1 shorter, slender; this and the palea hyaline. 

 Stamens 3. Styles short distinct, stigmas plumose with long hairs. 

 Grain oblong, enclosed by the glumes. Internodes often catching 

 sand and small insects by means of a sticky substance. 



Two species are very widely distributed in the tropics and 

 warmer temperate countries. 



1. N. racemosa (L.) Kuntze. Rev. Gen. PL 780 (1891). Cen- 

 chrus 7-acenwsns L. Sp. PI. 1049 (1753). Lappago 7'acemosa AYilld. 



