HYDROLEACEAE. 



Corolla-lobes distinctly dentate or erose. 



Corolla white ; stamens about twice as long as the corolla. 



8. P. alba. 

 Corolla purplish or pink ; stamens slightly exceeding the corolla. 



g. P. neo-mexicana. 

 Plant perennial, cespitose ; inflorescence spicate-thyrsiform. 



Plant equally sericeous throughout ; segments of the leaves narrowly linear. 



10. P. sericea. 



Plant finely pubescent, hirsute-c'iliate on the petioles ; segments of the 

 leaves oblong. n. P. ciliosa. 



1. Phacelia leucophylla Torr. On dry hills from S. D. and Wash, to Colo, 

 and Utah. Alt. up to 8000 ft. Horsetooth Gulch; mountains between Sun- 

 shine and Ward. 



2. Phacelia alpina Rydb. On mountains from Mont, to Colo, and Nev. 

 Alt. 7000-12,500 ft. Steamboat Springs; Silver Plume; Mt. Harvard; near 

 Ironton, San Juan Co. 



3. Phacelia heterophylla Pursh. On hills from Mont, and Wash, to Colo, 

 and Calif. Alt. 6000-9000 ft. Near Empire; Ironton Park, 9 miles south 

 of Ouray; foot-hills, Larimer Co.; Narrows, Poudre Canon; Howe's Gulch; 

 Dixon Canon ; gulch west of Pennock's ; Horsetooth Mountain ; Rist Canon ; 

 Rabbit-Ear Range, Routt Co.; Platte River; Colorado Springs; Eldora to 

 Baltimore; Ft. Collins; Amelia; Table Rock; Ute Pass, near Pike's Peak; 

 Pagosa Peak ; Van Boxle's ranch, above Cimarron ; Ouray ; Upper West 

 Mancos Canon ; Sangre de Cristo Creek ; East Indian Creek ; Lake Moraine ; 

 William's Canon, near Pike's Peak; Trail Glen; Boulder; Rist Canon; 

 Ragged Mountain. 



4. Phacelia integrifolia Torr. In gypsum soil from Colo, and Utah to 

 western Tex. and Ariz. ; also Mex. " Southwestern Colorado." 



5. Phacelia corrugata A. Nels. In dry soil from Colo, and Utah to western 

 Tex. and N. M. Alt. 4000-5000 ft. Grand Junction ; Rifle, Garfield Co. ; 

 Palisade. 



6. Phacelia splendens Eastw. In dry ground in Colo, and Utah. Alt. 

 5000-8000 ft. Ouray; Cimarron; Hotchkiss, Delta Co.; Grand Junction; 

 Lake City. 



7. Phacelia glandulosa Nutt. In gravelly soil from Mont, to western Tex. 

 and Ariz. Alt. 6000-10,000 ft. Mt. Harvard ; Cheyenne Canon ; West Span- 

 ish Peak; Walsenburg; Lake City; Cumbres; foot-hills, Larimer Co.; Howe's 

 Gulch. 



8. Phacelia alba Rydb. In valleys from Wyo. to N. M. Alt. 8000-10,000 

 ft. Headwaters of Clear Creek ; Sangre de Cristo Creek ; La Veta ; Placer ; 

 Doyle's ; Georgetown ; Marshall Pass ; Graymont ; Eldora to Baltimore. 



9. Phacelia neo-mexicana Thurber. In sandy soil from Colo, to N. M. 

 Alt. 4500-7500 ft. Georgetown ; between La Veta and Gardner, near Badito ; 

 Trinidad ; Salida ; La Porte, Larimer Co. ; Dillon Canon. 



10. Phacelia sericea Hook. In the mountains from Mont, and B. C. to 

 Colo, and Nev. Alt. 9000-13,000 ft. Lake City; mountains south of Ward, 

 Boulder Co.; Mt. Garfield; Tennessee Pass, 7 miles west of Leadville; Lead- 

 ville, Lake Co.; Mt. Harvard; Larimer Co.; Silverton; Medicine Bow Moun- 

 tains ; above Graymont ; above Como ; Beaver Creek ; Larimer Co. ; Eldora 

 to Baltimore. 



