^32 HYPERICACEAE. 



1. Hypericum formosum H. B. 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, El 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. 



1. HELIANTHEMUM Pers. Frostweed. 



I. Helianthemum majus (L.) B. S. P. {H. canadense Walkerae 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. 2. Calceolaria. 



I. VIOLA L. Violet. 



Acaulesceht ; flowers scapose. 



Plant stoloniferous, at least so after the flowering period. 



Flowers pale blue or lilac. 1. V. palustris. 



Flowers white. 



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

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



js. V. blanda. 

 Leaves reniform, 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. LeConfeana. 



Plant not stoloniferous ; flowers blue. 



Leaf-blades divided into linear lobes. 5. V. pedatiUda. 



Leaf-blades entire. 



Blade strongly decurrent upon the petiole ; cleistogenes horizontal. 



6. V. retusa. 

 Blade not decurrent ; cleistogenes erect or ascending. 



Sepals lanceolate, pointed ; leaves herbaceous. 7. V. cognata. 



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



8. V. nephropkylla. 

 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. K. Sheltonii. 



Leaf-blades entire or merely toothed. 



Blades lanceolate, tapering to a margined petiole, pubescent. 



10. V. NuttalUi. 

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



11. V. linguae folia. 

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



12. V. biHora. 

 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. retroscdbra. 



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



