74 PANICACE.E. 



Sp. PL 1:484 (1798). Tragus racemosus Hall. Hist. Stirp. Helv, 



2: 1413 (1768). A low, branching annual, 10-30 cm. liigh, culms 



smooth, 2-6 cm. long. Leaf-blades 2-4 cm. long, flat, thin, the 



margins clothed with prickles. Spikes 3-8 cm. long, 7-8 mm. 



broad, with the base included in the swollen sheaths. Spikelets in 



clusters of three, 3 mm. long, ovate-lanceolate, easily detached and 



carried away by animals. 



Pa. (Phila.), >S'mJwer 3620a from Dr. Brinton; Texas, Jones; 



Mississippi, Tracy cult. A rare weed introduced from Europe. 



2. N. occidentalis (Xees). T. occidentalis Nees, Agrost. Bras. 



286 (1829). Plant erect, 20-30 cm. high. 



Spikes dense, 5-8 mm. long, 5-6 mm. broad, 



the base often included. Spikelets in clusters 



of two, ovoid, 2-2.5 mm. long. The pedicels 



with a broad calloused base. 



Arizona, Pr ingle in 1884; ^ie^iao, Pringle 



„ ,o A- • 421; Colorado, Jones. 



Fig. 18. — ^azia oc- ' ' 



cidentalis. Spikelet. 19. (72). SCHAFFNERA Benth., Joum. 

 (Richardson.) ^. ^ ^- ^r, /-■ , ,-.\ 



Lmn. Soc. 19: 63 (1881)= 



Spikelets 1-4, 1-flowered, jointed on very short axillary pe- 

 duncles, flowers perfect or sterile. Glumes 2-3 ; if 3, then the first 

 is ciliate-fringed, 3-nerved, and about 1 mm. long, second almost 

 hyaline, 2-3 mm. long, 3-5 awned, third as long as the spikelet, 

 several-nerved, with an awn back of the apex; palea hyaline, 2- 

 nerved, 2-toothed or obtuse. Stamens 3. Anthers long and narrow. 

 Styles 2, distinct, long and slender. 



The above diifers in some respects from the description in Gen^- 

 ERA Plantarum, but corresponds to the specimen as I observed 

 it. Bentham at one time united this with the genus Zoysia 

 Willd. At first sight it seems to resemble Catliestechum. It ap- 

 proaches some species of Androjjogon {Cymhojjogon) andoi Apluda. 



One species is known, and that is found in Mexico. 



1. S. gracilis Benth. Hook. Ic. PI. (XIV.) 59, t. 1378 (1882). 

 A low, diffuse, branching annual, 15cm. high. Sheaths 1 cm. or 

 less in length; blades rough, narrow, 2-3 cm. long. Peduncles 

 unequal, partially included in the sheaths. Part of the spikelets of 



