1896. ] American Species of Ctenium. 363 
prima obliqua linealis, basi tuberculato-crassa, I-nervis, acuta 
interdum dentata; gluma vacua secunda 3 lineas longa, obli- 
qua, lanceolata, trinervis, nervo medio in aristam scabram 
excurrente ex quarta basali glume, pulvino in axilla ariste 
prominente, arista glumz subaequali, nervis lateralibus glan- 
duloso-tuberculatis per inferiorem bessem, scabris superne; 
gluma tertia vacua lanceolata acuta, sesquilinealis, arista 
duplo longiore, tenui, scabra, excurrente ex tertia summa 
glume, trinervis, marginibus albis ciliis cristatis basi dense 
barbata; gluma quarta cum palea neutra duas lineas excedens, 
lanceolata acuta, trinervata, marginibus medio pilis albis cris- 
tatis, semilinealis, arista dorso 4 lineas longa sub apice oriente; 
gluma quinta florens, duas lineas longa, arista 3 lineas longa, 
palea subaequilonga, apice bidentata 2-nervis, ciliatis; gluma 
sexta sterilis, glabra, brevipedicellata subapice mucronata 
sesquilinealis; gluma septima rudimentum, linearis, semiline- 
alis, pedicella tenuissima. 
is species is founded on no. 2814 Nelson, collected be- 
tween Niltepec and Zanatepec, Oaxaca, July 15, 1895, at an 
altitude of 400 feet. It has the habit of the Brazilian C. 
brevispicatum nom. nov., but the details of the spikelets do not 
agree, 
Ctenium brevispicatum, nom. nov. 
Campulosus brachystachyus Trin. Sp. Gram. f/. 302, not Nees. 
Culms cespitose, one to two feet high, distinctly pubescent 
above, glabrous at the nodes; leaves about a foot long, smooth 
and glabrous except on the slightly hispid margins; spikes 
one or two, digitate, from one and one-half to two inches 
long or longer; first empty glume one-fourth the length of the 
Spikelet; second empty glume as long as the spikelet; third 
and fourth glumes pilose at the base and along the margins 
above, awned from below the apex, the awns about equaling 
ibe glumes; fifth glume densely villous on the margins above, 
al usually a little shorter than the glume. 
razil. 
CTENIUM BRACHYSTACHYUM Kth. Rev. Gram. 447. p/. 137. 
oambulosus brachystachyus Nees Agrost. Bras. 417, not Trin. Spec. 
am. 22. 302. 
Culms cespitose, very slender, glabrous, one and one-fourth 
% two feet high; culm leaves rigid, scabrous on both sides, 
ur to five inches long; spike terminal, one and one-fourth 
0 one and one half inch long; spikelets 5-flowered; first 
“mpty glume very much shorter than the spikelet; the second 
