a re 
a 
New North American Grasses. 
F, LAMSON-SCRIBNER. 
WITH PLATES XI-—XIII. 
Avena Mortoniana, sp. nov.—Gramen humile, caespitosum 
alpinum, perenne, 4-6-pollicare, paniculis paucifloris, 1-2-pol- 
licaribus. = Culmi erecti, rigidi, striati, glabri; vagine glabre 
vel minute pubescentes superne; ligula plus minus semi-lin- 
ealis, decurrens, lamina 4-6-pollicaris, lineam lata vel angus- 
tor, rigida, convoluta siccitate, subtus glabra, supra pubescens, 
minute scabra marginibus. Radii panicule singuli vel gem- 
nati, breves, erecti, I-3 spiculas ferentes. Spicule plus 
{cue flosculos excedentes lanceolato-acute, prima uninervis, 
ray quam prima paulo longior, trinervis; gluma florens 
ree at: scabra, 7-8 lineas longa; callus basi glume flor- 
orang censissime pilosus, pilis sublinealibus; palea glumam 
ne fere, lanceolata, carenis minute subdenseque ciliatis 
" dimidio Superiore.— Tab, X7/. ! 
Allied to Avena Hookeri Scribn., from which it is distin- 
pushed by its smaller habit, shorter panicle, smaller and 
flowered spikelets, longer bearded callus, and more 
*nsely plumose prolongation of the rachilla. 
14 ountain summits near Silver Plume, Colo., altitude 13,000- 
Rydher, August. Nos. 697 C. L. Shear and 2,439 
‘ i Be Rydberg’s specimens were collected on Gray's 
prs Named for Hon. J. Sterling Morton, secretary of a 
Scie "In recognition of his interest in the promotion of the 
"is of agrostology. 
Fhe ots Parryi, sp. nov.—Gramen erectum, ee 
tantiby » '2-pedale, vaginis marcidis culmos basi amp 
Sed ple, 28inz glabra praeter fauces, internodis eke 
iatus, itates aa laminas superantes; ligula annulus breve ¢ 
yy nine 2-4 pollices longe summz plerumque breviores, 
M—Vo), XXI—No. 3, 
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