718 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



11. Stems depressed, often forming dense tufts; herbage not glandular, 

 loosely villous in the inflorescence; corolla white, 3 to 4 mm. 

 long; stamens usually included 9. G. minima. 



11. Stems erect, often diffusely branched; herbage glandular-puberu- 



lent; corolla yellow, 6 to 8 mm. long; stamens usually ex- 



serted 10. G. breweri. 



10. Inflorescence lanate; anthers sagittate; corolla limb normally blue or 

 lavender; leaves entire, or pinnately parted with 2 to 4 narrowly 

 linear or filiform divisions, these and the calyx lobes acerose but 

 not rigidly spinescent: Subgenus Hvgelia (12). 



12. Corolla less than 1 cm. long; anthers 0.5 to 1 mm. long. 



11. G. FILIFOLIA. 

 12. Corolla 1 cm. long or longer; anthers rarely less than 1, commonly 



about 2 mm. long 12. G. eremica. 



7. Calyx teeth equal or nearly so (13). 



13. Corolla rotate, the limb bright blue; plant suffrutescent, depressed; 

 leaves pinnate or subpalmate with few narrow, rigid, acerose 



divisions 13. G. rigidula. 



13. Corolla funnelform or salverform (14). 



14. Leaves opposite or, if alternate, then palmately 3- to 7-parted or 



divided, rigidly pungent, and often with very short branchlets 



in the axils (15). 



15. Plants perennial ; leaves alternate or opposite ; corolla showy, white. 



salverform or funnelform-salverform; plant with a phloxlike 



odor when dry: Section Leptodactylon (16). 



16. Corolla funnelform-salverform, the tube considerably surpassing 



the calyx; leaves (at least the upper ones) alternate, rigid, 



appressed or ascending at a narrow angle, the divisions 



acicular, usually less than 1 cm. long; seeds unchanged in 



water 14. G. pttngens. 



16. Corolla salverform, the tube not or but slightly surpassing the 



calyx; leaves opposite, soft, spreading, the divisions narrowly 

 inear or filiform, usually more than 1 cm. long; seeds muci- 

 laginous in water 15. G. NUTTALLII. 



15. Plants annual; leaves opposite: Section Linanthus (17). 



17. Corolla broadly funnelform, yellow or with a whitish limb, 10 



to 15 mm. long; leaves palmately parted, short, seldom more 

 than 1 cm. long; stems usually diffusely branched, 5 to 20 



cm. long 16. G. aurea. 



17. Corolla funnelform-salverform, white or tinged outside with 



brown purple; leaves entire, narrowly linear to nearly filiform, 



or parted with very few similar divisions, usually more than 



1 cm. long; flowers vespertine (18). 



18. Seeds unchanged in water; corolla 20 to 30 mm. long, the 



lobes equaling or longer than the tube. 



17. G. DICHOTOMA. 

 18. Seeds mucilaginous in water; corolla less than 15 mm. 

 long, the lobes half as long as the tube. 



18. G. bigelovii. 



14. Leaves all (or the upper ones) alternate, never palmately parted (19) . 



19. Plants perennial (occasionally biennial?); flowers showy; stems 



mostly erect: Section Ipomopsis (20). 



20. Inflorescence short and broad, corymbiform, loose or somewhat 



compact; leaf blades dentate or pinnately cleft, the basal 



ones obovate or oblanceolate; corolla coral pink when fresh; 



stamens included, the filaments almost none; seeds not 



changing in water 19. G. subnuda. 



20. Inflorescence elongate, thyrsoid; leaf blades pinnately parted 



(sometimes entire in G. mnltiflora) ; filaments well developed; 



seeds mucilaginous in water (21). 



21. Corolla 10 to 12 mm. long, light blue, lavender, or whitish; 



stamens usually conspicuously exserted and the upper 



ones declined; plant often suffrutescent. 



20. G. multiflora. 



