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 
sparingly 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 Walt. Fl. Car. 76. 1788 
Spikelets one quarter as wide as long or more, acute, the fourth scale yellowish when 
mature. 1, S. fimbriatum. 
Spikelets one fifth as wide as long, acuminate, the fourth scale greenish when mature. 
2. S. setosum. 
I, SYNTHERISMA FIMBRIATUM (Link) Nash, Bull. Torrey Club, 25: 
302. 1808. 
Digitaria fimbriata Link, Hort. Berol. 1: 226. 1827. 
Waste places, common. Catafio, Heller 107, and Bayamon, 
Heller 422. 
2. SYNTHERISMA sETOSUM (Desv.) Nash, Bull. Torrey Club, 25: 
300. 1808. 
Digitaria setosa Desv.; Hamilt. Prod. 6. 182 s 
Near Mayaguez, Heller 4308. 
13. TRICHACHNE Nees, Agrost. Bras. 85. 1829 
I. TRICHACHNE INSULARE (L.) Nees, Agrost. Bras. 86. 1829. 
Andropogon insularis L. Syst. Ed. 10, 1304. 1759. 
Panicum leucophaeum H.B.K. Nov. Gen. & Sp. 1: 97. 1815: 
In fields and along streams, frequent. Heller 136 and 650; 
Underwood and Griggs 131 and 564; Goll 479; Adjuntas road, 
near Ponce, Heller 6158. 
