378 Nash : Enumeration of the 



uppermost internode minutely appressed-pubescent : leaves nu- 

 merous ; sheaths glabrous or sparingly hispid, papillose-ciliate on 

 the margins, those on the main stem shorter than the internodes, 

 those on the branches overlapping ; ligule a ring of short hairs ; 

 blades erect or ascending, linear to linear-lanceolate, acuminate, 

 rough and green on the upper surface, smooth and glaucous on 

 the lower surface, the lower the shorter, only 2-3 cm. long, in- 

 creasing in length toward the summit where they are 5-10 cm. 

 long and 4-6 mm. wide : panicles long-exserted, 5-8 cm. long, 

 their main axis and widely spreading primary branches minutely 

 pubescent, the secondary branches similarly pubescent and at an 

 angle of about 45° with the primary branches: spikelets about 

 1.5 mm. long, on shorter pedicels, the two outer scales about 

 equal in length, equalling or a little shorter than the spikelet and 

 sparingh' pubescent at the apex, obtuse, the first broadly oval, the 

 second almost orbicular, the two flowering scales glabrous, yel- 

 lowish, about 1.3 mm. long. 



On the summit of El Yunque, Luquillo Mountains, Porto 

 Rico, Wilson, no. 160. 



12. SYNTHERISMA Wait. Fl. Car. 76. 1788 



Spikelets one quarter as wide as long or mrre, acute, the fourth scale yellowish when 



mature. I. S. fijiibriatuni. 



Spikelets one fifth as wide as long, acuminate, the fourth scale greenish when mature. 



2. S. setosuin. 



1. Syntherisma FiMBRiATUM (Link) Nash, Bull. Torrey Club, 25 : 



302. 1898. 

 Digitaria fiinbriata Link, Hort. Berol. i: 226. 1827. 

 Waste places, common. Cataiio, Heller 107, and Bayamon, 

 Heller 422. 



2. Svntherisma setosum (Desv.) Nash, Bull. Torrey Club, 25 : 



300. 1898. 

 Digitaria setosa Desv.; Hamilt. Prod. 6. 1825. 

 Near Mayaguez, Heller 4398. 



13. TRICHACHNE Nees, Agrost. Bras. 85. 1829 



I. Trichachne insulare (L.) Nees, Agrost. Bras. 86. 1829. 



Andropogon insiilaris L. Syst. Ed. 10, 1304. 1759- 

 Paniciim lauophaeinn H.B.K. Nov. Gen. & Sp. i : 97. 18 15. 

 In fields and along streams, frequent. Heller 136 and 650; 



Underwood and Griggs 131 and 564; Goll 479; Adjuntas road, 



near Ponce, Heller 6158. 



