FAGACEAE. 
99 
9. Quercus Fendleri Liebm. A shrub, 1-3 m. high, growing on dry hillsides 
from Colo, to Tex. and Ariz.—Alt. 5000-7000 ft.—Mesas near Colorado 
Springs; McElmo Canon; Raton Mountains, near Trinidad; Canon of Ar¬ 
kansas; Green Horn Mountains; Poncho Pass; Purgatory River, near 
Trinidad. 
10. Quercus pungens Liebm. ( Q . undulata Wrightii Engelm.) A low 
shrub, 1-3 m. high, on dry hills from Colo, to Utah, Tex. and Ariz.; also 
Mex.—Canon City; Arkansas Canon. 
11. Quercus undulata Torr. (Q . undulata Jamesii Engelm.) A shrub, 1-3 
m. high, growing on dry hills from Colo, to Tex. and Ariz.—“Rocky Moun¬ 
tains”; Canon of the Arkansas; Steamboat Springs. 
Order 21. URTICALES. 
Style and stigma 1 ; ovules erect or ascending; herbs with small greenish flowers ; 
fruit an achene. 39. Urticaceae. 
Styles and stigmas 2; ovules pendulous. 
Herbs or herbacious vines with opposite leaves; fruit an achene. 
40. Cannabinaceae. 
Trees or shrubs with alternate leaves ; fruit a samara or drupe. 
41. Ulmaceae. 
Family 39. URTICACEAE Reichenb. Nettle Family. 
Herbs with stinging hairs; leaves opposite; flowers not involucrate. 
1. Urtica. 
Herbs without stinging hairs; leaves alternate; flowers involucrate by leafy 
bracts. 2. Parietaria. 
1. URTICA L. Nettle. 
Teeth of the leaves ovate, strongly directed forward; stem sparingly strigose 
and bristly. 1. U. gracilis. 
Teeth of the leaves broadly triangular, not strongly directed forward; stem 
glabrous or nearly so. 2. U. gracilenta. 
1. Urtica gracilis Ait. In alluvial soil along streams from N. S. to Alaska, 
N. C. and N. M.—Alt. 4000-9000 ft.—Mountains between Sunshine and Ward; 
Steamboat Springs; Mancos; Bob Creek, West La Plata Mountains; Fort 
Collins; along the Uncompahgre River, near Ouray; chaparral-covered hills 
southeast of Ouray; Gunnison; Spring Canon; Campton’s ranch. 
2. Urtica gracilenta Greene. ( U . Breweri Coulter; not S. Wats.) Along 
streams from Wyo. to Tex. and N. M.—Alt. up to 9000 ft.—Near Pagosa 
Peak. 
2. PARIETARIA L. Pellitory. 
Leaf-blades lanceolate, 2-7 cm. long, twice as long as the petioles or longer. 
1. P. pennsylvanica. 
Leaf-blades oblong or ovate-oblong, 0.5-2 cm. long, not twice as long as the 
petioles. 2. P. obtusa. 
1. Parietaria pennsylvanica Muhl. On shaded banks and hillsides from 
Ont. to B. C., Fla. and Mex.—Alt. 4000-7000 ft.—Steamboat Springs; Lower 
Boulder Canon, Boulder Co.; Black Canon; foot-hills, Larimer Co.; gulch 
west of Pennock’s mountain ranch; along Poudre River, near Fort Collins; 
Horsetooth Gulch. 
