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 Torn (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 i ; 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. 



I. Urtica. 

 Herbs without stinging hairs ; leaves alternate ; flowers involucrate by leafy 

 bracts. 2. Parietaria. 



I. URTICA L. Nettle. 



Teeth of the leaves ovate, strongly directed forward ; stem sparingly strigose 



and bristly. i. 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 Caiion; Campton's ranch. 



2. Urtica gracilenta Greene. {U. Brewcri 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. 



I. P. pennsylvanica. 

 Leaf-blades oblong or ovate-oblong, 0.5-2 cm. long, not twice as long as the 

 petioles. 2. P. obtusa. 



I. Parietaria pennsylvanica Muhl. On shaded banks and hillsides from 

 Dnt. to B. C, Fla. and Mex. — Alt. 4000-7000 ft. — Steamboat Springs; Lower 

 Boulder Caiion, Boulder Co. ; Black Cafion ; foot-hills, Larimer Co. ; gulch 

 west of Pennock's mountain ranch ; along Poudre River, near Fort Collins ; 

 Horsetooth Gulch. 



