RYDBERG: STUDIES ON THE Rocky Mounvain FLorA 305 
longer pedicels (in C. reticulata 1 cm, long or less) and in its 
serrate, short-acuminate leaves, which are less pubescent, more 
shiny, and much less rough above. It grows in gulches and 
mountain valleys of Colorado. 
CoLorapo: Golden, Aug. 29, 1895, P. A. Rydberg (herb. N. Y. 
Bot. Garden) ; Aug. 30, 1895, C. L. Shear 3263; gulch west of Pen- 
nock’s mountain ranch, May 26, 1897, C. S. Crandall 2254. 
Celtis occidentalis L. is included in the ‘Roéky Mountain flora 
by Coulter & Nelson,* but errongously so, the writer thinks. 
Celtis Douglasii Planchon, C. rugosa, ‘and perhaps also C. reticulata 
Torr. have been mistaken for it. 
URTICACEAE 
‘Urtica strigosissima sp. nov. 
Perennial, dioecious; stem 1 m. high or more, glabrous below, 
strongly retrorsely strigulose above, but almost without bristles; 
stipules narrowly linear-lanceolate, acuminate; petioles 2—3 cm. 
long; leaf blades lanceolate, 3-5-ribbed, sharply serrate, rounded 
Or acute at the base, long-acuminate at the apex, 5-10 cm. long, 
15-5 cm. wide, finely strigulose beneath; flower clusters slender, 
the upper almost equalling the leaves; sepals ovate, about equal- 
ling the achenes, 
This species resembles U. gracilis Ait. in habit and leaf form, 
but is more strigose and rarely at all bristly. In pubescence it 
fsembles U. Brewer; S. Wats. but has narrower leaves and nar- 
rowly linear-lanceolate, acuminate, instead of oblong and obtuse, 
Stipules, [t 8TOws on river banks at an altitude of 1,000-2,500 m. 
Ipaxo: Forest, Nez Perces County, July 29, 1896, A. A. & 
E, Gertrude Heller 3475 (herb. Columbia University). 
pe fifth to one third as long as the leaf blades; these from narrowly 
Nceolate to ovate, coarsely toothed, 4-10 cm. long, thin, light 
ey almost glabrous; panicles many-flowered, often equalling 
~~ Upper leaves: sepals oval or ovate, usually half longer than 
the achenes, 
et 
New Man. Bot. Cent. Rocky Mts. 143. 
Ed 
