FLOWERING PLANTS AND FERNS OF ARIZONA 801 



13. Sterile stamen an elongate, often bearded filament not or not much 

 shorter than the anther-bearing filaments; corolla large, showy, 



often bearded in the throat 8. Penstemon. 



11. Stamens 4 or fewer, without any rudiment of a fifth (14). 

 14. Anther-bearing stamens normally 2 (15). 



15. Cells of the anthers separated by a relatively broad membrana- 

 ceous connective: corolla whitish with a yellow tube; sterile 



stamens none or very rudimentary 11. Gratiola. 



15. Cells of the anthers contiguous at apex and often confluent: 



corolla blue, purple, or whitish (16). 



16. Stems leafy: leaves opposite, at least below the inflorescence: 



flowers in relatively loose racemes; corolla nearly regular, 



4-lobed, rotate or nearly so; stamens not or not conspicuously 



exserted at anthesis 16. Veronica. 



16. Stems scapelike: cauline leaves alternate; flowers in very dense, 

 cylindric, spikelike racemes; corolla very irregular, cleft 

 nearly to the base; stamens and style conspicuously exserted 



at anthesis 17. Besseta. 



14. Anther-bearing stamens 4 or (in genus Mimetanthe) exceptionallv 2 

 17 . 

 17. Anthers 1-celled: calyx elongate, cylindric: corolla violet, with 

 a long slender tube and scarcely any throat . . 19. Buchxera. 

 17. Anthers 2-celled or (in genus Limosella) 1-celled bv conflu- 

 ence (18). 

 18. Calyx prismatic, more or less tubular, 5-toothed and with 

 5 longitudinal ribs or plaits: corolla more or less distinctly 

 bilabiate, often showy; stamens 4, all anther-bearing; stigma 



often much dilated 9. MnirLus. 



18. Calyx not prismatic (19). 



19. Corolla yellow: herbage pubescent (20). 



20. Plant annual: herbage viscid-villous: calyx nearly equaling 

 the corolla, campanulate; corolla less than 1 cm. long. 



14. Mimetanthe. 



20. Plant perennial: herbage hispidulous: calyx much shorter 



than the corolla, turbinate: corolla about 2 cm. long. 



18. Gerardia. 

 19. Corolla white or purple or, if vellow, then the herbage glab- 

 rous (21). 



21. Anther cells confluent; corolla nearly regular, the tube 



campanulate: leaf blades entire 15. Limosella. 



21. Anther cells distinct: corolla distinctly bilabiate, the tube 

 cylindric; leaf blades not entire (22). 

 22. Divisions of the calyx unequal in width, the 3 outer 

 ones much broader: herbage glabrous: anther cells 

 of the 2 longer stamens divergent and stipitate. 



13. Pagesia. 



22. Divisions of the calyx nearly equal in width, all narrow: 



herbage glandular-pubescent; anther cells of all of 



the stamens somewhat divergent and stipitate; 



limb of the corolla violet purple (23). 



23. Leaf blades denticulate to serrate; stems seldom less 



than 25 cm. long 10. Stemodia. 



23. Leaf blades pinnately parted, with narrow divisions: 

 stems not more than 15 cm. long 12. Coxobea. 



1. VERBASCUM. Mulleix 



Plants herbaceous, biennial; stems tall, leafy; leaves sessile, clasp- 

 ing or decurrent at base ; flowers in elongate spikes or spikelike racemes ; 

 corolla yellow, with 5 rounded slightly unequal lobes; filaments (some 

 or all of them) bearded; style flattened at apex. 



Coarse introduced weeds. The leaves and flowers of V. thapsus 

 have been used medicinally. It is reported that the Hopi Indians 

 dry and smoke them, mixed with Macromeria thurberi, in treatment 

 of mental aberrations. 



