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HYDROLEACEAE. 
Calyx not much enlarged in fruit with appendages in the sinuses. 
3. Nemophila. 
Corolla-lobes imbricated in the bud ; placentae narrow. 4. Phacelia. 
Ovary imperfectly 2-celled; styles 2, distinct; leaf-blades entire. 
5. Marilaunidium. 
1. HYDROPHYLLUM L. Waterleaf. 
Peduncles shorter than the petioles and mostly shorter than the flower-clusters; 
anthers oblong. 1. H. capitatum. 
Peduncles longer than the petioles; anthers oblong-linear. 2. H. Fendleri. 
1. Hydrophyllum capitatum Dougl. In wet places on hillsides from Mont, 
and B. C. to Colo, and Calif.—Alt. about 9000 ft.—Grand Mesa, Gunnison 
watershed; Rabbit-Ear Range, Routt Co.; Steamboat Springs. 
2. Hydrophyllum Fendleri (A. Gray) Heller. ( H. occidentale Fendleri 
A. Gray) Along streams and among bushes from Wyo. and Ida. to Colo, 
and N. M.—Alt. 5000-10,000 ft.—West of Ft. Collins; near Pagosa Peak; 
Apex; Van Boxle’s ranch, above Cimarron; Villa Grove; Idaho Springs; 
Ojo; East Indian Creek; Pass Creek; Chicken Creek, West La Plata Moun¬ 
tains ; Horsetooth Gulch; Rist Canon; Dixon Canon; mountains between 
Sunshine and Ward; Empire. 
2. MACROCALYX T rew. 
1. Macrocalyx Nyctelea (L.) Kuntze. ( Ellisia Nyctelea L.) In damp 
places from Sask. and Mont, to Va. and Colo.—Alt. 5000-9000 ft.—Ft. Col¬ 
lins; New Windsor, Weld Co.; Cerro Summit, Gunnison watershed; Sangre 
de Cristo Creek; Cucharas River below La Veta; Horsetooth Gulch; Spring 
Canon. 
3. NEMOPHILA Nutt. 
1. Nemophila breviflora A. Gray. In rich soil from Mont, and Ida. to 
Colo, and Ore.—Steamboat Springs. 
4. PHACELIA Juss. 
Leaves all simple and entire or some of the lower pinnately 3-5-divided with 
entire divisions; capsule acute; ovules 4. 
Plant densely whitish canescent. 1. P. leucophylla. 
Plant pubescent but not canescent. 
Plant decumbent or ascending, slender, 1-3 dm. high; inflorescence open 
with a few branches. 2. P. alpina. 
Plant erect or sometimes ascending, 3-5 dm. high, stout and more leafy; 
inflorescence dense with numerous short branches. 3. P. heterophylla. 
Leaves from sinuate-crenate to twice-pannatifid. 
Plant annual, not cespitose. 
Corolla-lobes entire or merely sinuate-crenate. 
Leaves sinuate-crenate to lobed half-way to the midrib. 
Stem-leaves ovate, oval or elliptic in outline; edges and ridge of the 
seeds not with cross ridges. 4. P. integrifolia. 
Stem-leaves oblong in outline; edges and salient ventral ridge of the 
seeds with rounded cross-ridges. 5. P. corrugata. 
Leaves pinnately divided to the midrib. 
Terminal divisions of the leaves large and obovate in outline. 
6 . P. splendens. 
Terminal divisions of the leaves not much enlarged, ovate, lanceolate 
or oblong in outline. 7. P. glandulosa. 
