Panicearum genera ac species aliter disposita. IV. 181 
the sterile lemma densely hairy on all the internerves, while in V. 
saccharata the middle four internerves are glabrous, the hairs of the 
lateral internerves and margins and of the second glume being also 
much longer than in V. Hitchcockii; the fruit of the latter is much 
smaller, less acuminate and the lemma more broadly margined than in 
V. saccharata. — This species is known only from Texas. It was also 
collected by G. C. Nealley, at Sanderson, Pecos County, in September, 
1892, and at Del Rio, October, 1892, both collections being distributed 
as no. 109. — Until the South American species referable to Valota are 
better known the transfer of Nees’ species of Trichachne to this genus 
is deferred. 
32. Thrasya thrasyoides (Trin. A. Chase, l. c, p. 114, fig. 1. — 
Panicum thrasyoides Trin. Gram. Pan., 126, 1826. „Brasil. (Langs- 
dorff)*. The type specimen, in the Trinius Herbarium, is labeled „Pani- 
cum thrasyoides m. ubique in campis siccis, Brasiliae crescens, leg. 
mense Dec. 1824, cl. Langsdorff“, 
33. Thrasya petrosa (Trin. A. Chase, l. c., p. 115. — Panicum pe- 
trosum Trin., Gram, Icon., 3; pl. 280, 1836. Trinius states that the 
illustrationis „ad specimen Brasilianum*. The type specimen, in 
the Trinius Herbarium, labeled „Panicum petrosum m.  Cuyaba febr. 
1827“, was probably collected by Langsdorff. — Tylothrasya petrosa 
Doell, in Mart. Fl. Bras. 2, ?295, pl. 37, 1877. Based on Panicum pe- 
trosum Trin, Doell bases his genus Tylothrasya on this species, the 
basal callus being the character by which de differentiates it from 
Thrasya H. B. K.  Thrasya thrasyoides, however, has this callus though it 
is less pronounced than in T. petrosa. Bentham (Linn. Soc. Journ, Bot., 
19; 42, 1881) misspells the specific name „petraeum“. 
34. Thrasya campylostachya (Hack.) A. Chase, l, c., p. 115. — Pani- 
cum campylostachyum Hack., Österr. Bot. Zeitschr., 51; 367, 1901. „Costa- 
rica; in savannis ad Canas Gordas, leg. Pittier, no. 11012 et 11018*. 
The type (no. 11012) is in Hackel's herbarium, a duplicate is in the Na- 
tional Herbarium, — This and Thrasya cultrata (Trin.) new differ from 
Th. paspaloides H. B. K., Th. thrasyoides (Trin. and Th. petrosa (Trin.) in 
the lack of the quill-like hairs on the halves of the split sterile lemma, 
and also on the summit of the fruit. 
35. Echinolaena inflexa (Poir) A. Chase, l. c. p. 117, fig. 2. — 
Cenchrus inflexus Poir, Encyc. Suppl, 6; 50, 1804. „M. Richard la 
recueillie à Cayenne. (V. s. in herb. Jussieu & Lam.)* The type spe- 
cimen in the herbarium of the Muséum at Paris was examined by Prof. 
Hitchcock and found to be the same species as the type of Echinolaena 
hirta Desv. in the same herbarium. Trinius (Gen. Pan., 75, 1826) also 
referred C. inflerus Poir. to E. scabra H. B. K. Poiret observes that he 
finds no involuere, that the species may belong to another genus. and 
that it deserves further study. — Cenchrus marginalis Rudge, Pl. Guian., 
19, pl. 25, 1805. No locality nor specimen is cited. The type has not 
been examined but the plate and description identify the species. — 
