*'-'3- IIVPKRICACEAE. 



1. Hypericum formosum 11. H. K. On hillsides and mountain valleys from 

 Colo, and Utah to Mex. and S. Calif. — Alt. 6000-10,000 ft. — South Park; 

 Pagosa Springs ; Colorado Springs ; Mancos ; Elk River, Garfield Co. ; Mar- 

 shall Pass; near Manitou, EI Paso Co.; Chambers' Lake; Wahatoya Creek; 

 Gypsum Creek Canon ; Poudre Canon. 



2. Hypericum majus (A. Gray) Britton. In wet meadows from Me. and 

 B. C. to N. J. and Colo. — Alt. 4000-6000 ft. — Foot-hills, near Boulder. 



Family 90. CISTACEAE Lindl. Rock-rose Family. 

 I. HELIANTHEMUM Pers. Frostweed. 



I. Helianthemum majus (L.) B. S. P. (//. canadense Walkcrae Evans) 

 On hillsides from N. S. and S. D. to N. C. and Colo. — Douglas County. 



Family 91. VIOLACEAE DC. Violet Family. 



Sepals more or less auricled at base. i. Viola. 



Sepals not auricled at base. z. Calceolaria. 



I. VIOLA L. Violet. 



Acaulescent ; flowers scapose. 



Plant stoloniferous, at least so after the flowering period. 



Flowers pale blue or lilac. i. V. palnstris. 



Flowers white. 



Upper and lateral petals twice as long as broad ; petioles not red-spotted. 

 Leaves ovate, pointed, green ; lateral petals veined with purple. 



2. V. blanda. 

 Leaves reniforni, not pointed, glaucous ; lateral petals not veined. 



3. V. Macloskeyi. 

 Upper and lateral petals three times as long as broad : petioles and scapes 



red-spotted. 4. V. LeConteana. 



Plant not stoloniferous ; flowers blue. 



Leaf-blades divided into linear lobes. 5. I', pedatiflda. 



Leaf-blades entire. 



Blade strongly decurrent upon the petiole ; cleistogenes horizontal. 



6. J^. retusa. 

 Blade not decurrent ; cleistogenes erect or ascending. 



Sepals lanceolate, pointed; leaves herbaceous. 7. 1'. cognata. 



Sepals oblong, obtuse, 3-nerved ; leaves subcoriaceous. 



8. V. nephrophylla. 

 Caulescent, leafy-stemmed. 



Flowers yellow or tinged with brown. 



Stems short or subacaulescent at flowering time. 



Leaf-blades pedately divided into narrow segments ; petals tinged with 



brown beneath. 9. V. Sheltonii. 



Leaf-blades entire or merely toothed. 



Blades lanceolate, tapering to a margined petiole, pubescent. 



10. V. Nuttallii. 

 Blades ovate to oblong-ovate, scarcely or not at all tapering to the petiole. 



11. V. linguaefolia. 

 Stems erect or ascending, bearing scattered long-petioled orbicular leaves. 



12. V. hiflora. 

 Flowers blue, purple or white. 



Flowers white or tinged with purple beneath. 13. V. canadensis. 

 Flowers blue. 



Plant rough-pubescent, 1-2 dm. high. 14. V. retroscabra. 



Plant glabrous, 2-6 cm. high. 15. V. bellidifolia. 



