484 GRAMINEZ. 
. Eriochloa acuminata, Kunth, Enum. PI. i. p. 72. 
Piptatherum acuminatum, Presl, Reliq. Henk. i. p. 221. 
Helopus acuminatus, Fourn., et H. gracilis, Fourn. Mex. Pl. Enum., Gram. p. 13. 
New Mexico; Texas; ARKANsAS.—NortH Mexico, San Luis Potosi (Virlet d’ Aoust) ; 
SourH Mexico, Trapiche de la Concepcion (Liebmann), Vera Cruz to Orizaba (Miller, 
2109; Liebmann, 436).—Southward to Uruevay, and widely dispersed in the warmer 
regions of the OLD Worip. Hb. Kew. 
We have followed Bentham in the circumscription of this species, of which, common 
as it is in some parts of America and the Old World, we have seen only one Mexican 
specimen, and none from Central America. 
4, ISACHNE. 
Isachne, R. Br. Prodr. Fl. Nov. Holl. p. 196; Benth. et Hook. Gen. Plant. iti. p. 1100. 
This genus numbers about twenty species, spread nearly all over the warmer regions 
of both hemispheres; but the majority of the species are natives of the Old World. 
The Mexican and Central-American species are in sucha state of confusion that we are 
unable to determine what names they should bear. Thus, Fournier (Mex. Pl. Enum., 
Gram. p. 35) distinguishes two Mexican species, which he refers to [. dispersa, Fourn. 
(Panicum dispersum, Lam.), and J. ventricosa, Doll (Panicum salzmanni, Trin.). Grise- 
bach (Fl. Brit. W. Ind. p. 553) treats Panicum dispersum, 'Trin., [sachne dubia, Kunth, 
and Jsachne panicea, Trin., as synonyms of his Zsachne arundinacea (Panicum arundina- 
ceum, Swartz). In the Kew Herbarium some of the specimens referred by Fournier to 
Isachne ventricosa, Doll, were first named Jsachne panicea, Trin., by the late General 
Munro ; but in a later memorandum he states that he had seen the true [sachne panicea, 
Trin., in Lindley’s herbarium, named by Trinius himself, and found that it was quite 
distinct from the specimens which he, General Munro, had so named in the Kew 
Herbarium; and he proposed making a new species, and actually gave a manuscript 
name, which we forbear printing because of the uncertainty respecting the names the 
Mexican species should bear. 
In the Kew Herbarium there are two species from Mexico. One is represented by a 
single specimen from the valley of Cordova (Bourgeau, 1458), which is referred, at 
least as to Bourgeau’s number, to I. disperma by Fournier. This has hairy culms, and 
the leaves are scabrid beneath. The other is represented by specimens from Mirador 
(Linden, T1 and 283), Consoquitla (Liebmann, 143), Orizaba (Miller, 78; Bilimek, 
450), and without a locality (Harris); and is the J. ventricosa of Fournier, but not of 
Ddll, and the proposed new species of Munro. 
Besides the two Mexican species, there are two others in the Kew herbarium from 
within our limits, namely, one from Panama (Seemann, 122; Hayes, 289), and one 
from Nicaragua (Zate, 453). The former is named Jsachne trachysperma, Nees, by the 
author himself (Seem. Bot. Voy. ‘Herald,’ p. 224), and the same species is named 
Isachne ventricosa, Doll, by Bentham without the sign of doubt. The Nicaraguan 
