155 
Richardsonit, Link, is a more western species, not yet found east 
of the Rocky Mountain region. These plants, as understood by 
me, are presented below. 
Stipa Macounii, Scribner, Macoun Catalogue Can. Pl. v. p. 390; 
Stipa Richardsonii, Gray (non Link), Man. 2d. ed. p. 249, 
6th ed. p. 641; Coulter Man. Rocky Mt. Bot. p. 408, exclu- 
sive of locality (Montana) reference; Oryzopsis Richardsonit, 
Beal, Bot. Gaz. xv. p. III. 
Petitcodiac, N. B., North Shore of Lake Superior, Lake Mis- 
tassini, N. E. T., near Edmonton on the Saskatchewan, and nor- 
therly to the Lesser Slave Lakes (Macoun Cat. iv. p. 190); Pleas- 
ant Mountain near Sebago Lake, Maine, Mt. Marcy, N. Y. (Gray 
Man. 6th ed. p. 641). I have it from North Conway, N. H. 
(C. E. Faxon), Mt. Desert, Maine (E. L. Rand), and from the 
Lake Superior region. 
In this plant the empty glumes are sub-equal, broadly obtuse 
or very abruptly short pointed, 4-4.5 mm. long, the first broader 
than the second, slightly exceeding the flowering glume, which 
is rather thinly clothed with short hairs and is supported on a 
very short obtuse callus. Awn 8-11 mm. long. The panicle, 
which is 4-12 cm. long, closely resembles that of Stipa Mongolica. 
It will be noted that this grass has been referred to Oryzopsis, 
the specific name Richardsonii being held under the impression 
that it was Richardson’s plant. There is no clear cut line sepa- 
tating Stipa from Oryzopsts, and artificial characters are resorted 
to in making the division. In both genera the awn is articulated 
with the flowering glume, and both have a distinct callus at the 
base of this glume, but in one the awn is deciduous (sometimes 
caducous), and the callus is very short and blunt; in the other the 
awn is more persistent and the more prominent callus is sharp 
Pointed. With such a limitation the border line is pretty certain 
to remain debatable ground, and to pronounce whether our plant 
isa Stipa or an Oryzopsis belongs rather to that indefinable facul- 
ty or intuition which comes with long observation and much ex- 
Perience in sorting material in classification. If placed am Ory- 
Z0psis this species must become O. Macounit, as the Richardsoniz, 
Gray, is not tenable. : 
Stipa Richardsonii, Link, Hort. Berol. II. ‘Pp. 245 (1833); Trin. 
