8 



Ac. Sc, ii\ 413) which he collected on the Island of Santa Cruz, 



coast of California, as being from 15 to 18 feet in height, and 



bearing an inflorescence which in the largest specimens measures 



3 feet in the aggregate length of the spikes. In other respects, 



like T. angitstifolia. 



This form has been reported as occurring in Texas, and it is 



found in Mexico, throughout the West India Islands, and near 

 Buenos Ayres, S. America. 



New or Little Known Grasses, I. 



Plate LXXVL 



The following species of grasses have been known for some 

 years in herbaria, but have remained until this time without pub- 

 lished descriptions. 



I. MUHLENBERGIA. Arizonica, Scrib. (A, figs. 1-6). Culms 

 densely tufted, 15-35 cm. high, including panicle, which is from 

 8-18 cm. long, with a habit as represented in figure i. Leaves 3-5 



mm. long by \-\% mm. broad, flat, many nerved and minutely 



scabrous on the margins, especially near the very acute tips. 



1 



Ligule short. Panicle ovate in outline, branches very slender and 

 few-flowered, pedicels minutely scabrous. Spikelets about 3 mm. 

 long, empty glumes nerveless, obtuse, nearly equal, slightly over 

 I mm. in length; flowering glume finely pubescent on the mar- 

 gins and dorsal nerve near the base, minutely two-toothed at 

 apex and bearing a short (^ mm.) awn. 



Mesas, near the Mexican boundary, Pringle, 1884, ^"*J No.> 

 402 Pringle, '' PlantcB Mexicance^' 1885. 



2. SporobOLUS INTERRUPTUS, Vasey (B, figs. I-5). Culms 

 densely caespitose from a strong fibrous root, usually about 40 

 cm. high, including the lead colored panicle, which is from 10- 18 

 cm. long with a habit as rei:)resented in figure i. Culm leaves two, 

 the lower about 8 cm. long, the upper somewhat shorter; flat, 2 

 mm. wide or less, very finely scabrous above and along the mar- 

 gins, especially towards the narrow and somewhat pungent tips. 

 Ligule a ciliate inw^^ with a few long hairs at the margins. 

 Spikelets often glomcrated along the ascending branches, 6-^] 

 mm. long ; empty glumes broadly lanceolate, acute, the first 

 about 3 and the second about 5 mm. long; flowering glume a 



