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. 

 i. 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. 



Acaulescent ; flowers scapose. 



Plant stoloniferous, at least so after the flowering period. 



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



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 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. LeConteana. 



Plant not stoloniferous ; flowers blue. 



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



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. 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. biflora. 

 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. 



