HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 117 



Colombia: Corinto, Pittier 1005. 

 British Guiana: Without locality, Jenman 5975. 

 French Guiana: Without locality, Leprieur 69. 

 Brazil: Bahia, Riedel in 1831. 



Explanation of Plate 25.— Isachne polygonoides. Specimen from Panama, Amer. Gr. Nat. Herb. 599. 

 Natural size. 



2. Isachne leersioides Griseb. 



Isachne leersioides Griseb. Mem. Amer. Acad. n. ser. 8: 533. 1862. This is in the 

 second part of Plantae Wrightianae. The only specimen cited is Wright's no. 755. 

 Grisebach's specimen of this number, which is the type, is without locality other 

 than eastern Cuba. A specimen in the Gray Herbarium is labeled Monte Verde. 



DESCRIPTION. 



Culms slender, branched, trailing, glabrous, striate, 1 to 2 meters long; sheaths 

 on the main culms much shorter than the elongate internodes, overlapping on the 

 flowering branches, appressed papillose-hispid or nearly glabrous; ligule a very short 

 membrane, ciliate with stiff hairs about 1 mm. long; blades linear, ascending, rather 

 firm, 5 to 15 cm. long, 0.5 to 4 mm. wide, long-acuminate, cartilaginous-margined, 

 scabrous or hispidulous on both surfaces; panicles terminating the branches, ovoid or 

 oblong, 5 to 15 cm. long, as much as 7 cm. wide, the branches mostly single, rather 

 stiffly ascending or spreading, bearing from near the base stiffly spreading branchlets, 

 the spreading pedicels 2 to 3 mm. long; spikelets about 1 mm. long; glumes hispidulous; 

 florets appressed-pubescent. 



DISTRIBUTION. 



Dry cliffs and pine barrens, Cuba. 

 Cuba: Sierra de las Yeguas, Leon 5078. Zaza del Sur, Leon 6730. Sierra del Caba" 

 llete, Leon 6520. Cajalbana, Leon 4843. Woodfred, Shafer 3013. La Perla, 

 Shafer 8561. Monte Verde, Wright 755. 



Explanation of Plate 26.— Isachne leersioides. Specimens from Cuba, Leon 4843 and 5078. Natural 

 size. 



3. Isachne pygmaea Griseb. 



Isachne pygmaea Griseb. Fl. Brit. W. Ind. 553. 1864. "Hab. Jamaica!, Macf., 

 probably an alpine grass, like the preceding [I. rigens]." The type, collected by 

 Macfadyen but without exact locality, has been examined in the Grisebach 

 Herbarium. 



DESCRIPTION. 



Plants low, the slender branches spreading, glabrous, the flowering shoots usually 

 less than 15 cm. tall, rarely as much as 30 cm. long; sheaths glabrous, ciliate on the 

 margins; ligule a very short hispidulous ring; blades narrowly oblong-lanceolate, 

 0.5 to 2 cm., or rarely 3 cm. long, rarely over 2 mm. wide, spreading, glabrous or 

 puberulent, the white cartilaginous margin somewhat scabrous; panicles long-exserted, 

 narrow, compact and spikelike, usually less than 2 cm. long, the lower branches 

 short and somewhat distant, appressed or rarely ascending; spikelets about 1.3 mm. 

 long, nearly sessile; glumes glabrous, about two-thirds as long as the spikelet; florets 

 glabrous. 



DISTRIBUTION! 



Grassy banks. This rare grass has a very limited distribution, being known 

 only from a small area in the Blue Mountains of Jamaica between Newcastle and 

 Cinchona, at about 1,500 meters altitude. 



Jamaica: Cold Spring Gap, Amer. Gr. Nat. Herb. 419; Harris 11314, 12490. Moodys 

 Gap, Britton 3375. 



Explanation of Plate 27.— Isachne pygmaea. Specimen from Jamaica, Amer. Gr. Nat. Herb. 419. 

 Natural size. 



