532 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Range: Western Texas to southern California. 



New Mexico: Shiprock; Farmington; headwaters of the Pecos; Sandia Mountains; 

 Stanley; west of Santa Fe; Socorro; Mangas Springs; Black Range; Belen; Mesilla 

 Valley; Florida Mountains. Dry hills and plains, in the Lower and Upper Sonoran 

 zones. 



3. PHACELIA Tubs. 



Annual or perennial herbs, mostly pubescent or glandular, with alternate (sometimes 

 opposite below) lobed or dissected or entire leaves and helicoid cymes of flowers; 

 calyx slightly accrescent, not appendaged; corolla white, blue, or purple, mostly fun- 

 nelform, the tube often appendaged within, the lobes imbricated, spreading; stamens 

 included or exserted; ovary 1-celled, the style 2-cleft; capsules 1-celled or almost 

 2-celled by the dilation of the placentae, 2-A r alved, the seeds reticulate or roughened. 



KEY TO THE SPECIES. 



Perennials. 



Leaves simple and entire or some of the lower pinnate but 



with entire divisions 1. P. heterophylla. 



Leaves pinnately parted into linear or linear-oblong divisions. 2. P. sericea. 

 Annuals or rarely biennials. 



Leaves entire 17. P. demissa. 



Leaves not entire. 



Corolla lobes dentate or erose. 



Stamens twice as long as the corolla; leaves with 



narrow segments 3. P. alba. 



Stamens only slightly exceeding the corolla; leaves 



with broad segments 4. P. neomexicana. 



Corolla lobes entire or sinuate-crenate. 



Leaves bipinnate 5. P. popei. 



Leaves not bipinnate. 



Leaves sinuate-crenate halfway to the midrib 7. P. corrugata. 



Leaves, at least part of them, pinnately divided to 

 the midrib. 

 Sepals much longer than the capsule; stems slen- 

 der, weak, decumbent 6. P. rupestris. 



Sepals slightly if at all exceeding the capsule; 

 stems stout; usually erect. 

 Branches very numerous from the base, spread- 

 ing. 



Corolla blue, 6 to 8 mm. long 8. P. similis. 



Corolla white, 3 to 4 mm. long 9. P. arizonica. 



Branches few, most of them from above the 

 base, erect. 



Stamens included 10. P. caerulea. 



Stamens exserted. 



Flowers 10 mm. long or more 11. P. glandulosa. 



Flowers 8 mm. long or less. 

 Stems and leaves merely glandular- 

 viscid. 

 Calyx densely hirsute; flowers 7 to 8 



mm. long 12. P. crenulata. 



Calyx sparingly hirsute or merely 



viscid; flowers 5 mm. long or less. 13. P. intermedia. 

 Stems densely villous or hirsute as well 

 as glandular. 



