1308 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



5. Pentstemon antirrhinoides Benth. ; A. DC. in DC. Prodr. 10: 594. 1846. 



Baja California. Southern California. 



Shrub, 1.5 meters high or less, the branches puberulent or glabrous ; leaves 

 elliptic to oblong, 1.5 cm. long or less, entire or serrate; corolla yellow, 1.5 

 to 2.5 cm. long. 



5. RUSSEI/IA Jacq. Enum. PI. Carib. 6. 1760. 



Reference: Robinson, Proc. Amer. Acad. 35: 319-321. 1900. 



Shrubs, the branches usually angulate; leaves opposite or verticillate, usu- 

 ally furnished with numerous resin glands; flowers red, mostly in cymes; 

 calyx 5-cleft; corolla tubular, the limb somewhat bilabiate, 5-lobate, the lobes 

 rounded ; stamens 4. 



Stems 4-angulate. 

 Leaves entire. 



Corolla about 18 mm. long 1. R. subcoriacea. 



Corolla about 13 mm. long 2. R. campechiana. 



Leaves crenate or serrate. 



Stems with thin wings along the angles 3. R. tetraptera. 



Stems not winged. 

 Calyx lobes gradually attenuate, the tips not subulate; flowers 2 to 2.4 



cm. long 4. R. jaliscensis. 



Calyx lobes with subulate tips ; flowers 1.5 cm. long or less. 



Leaves cordate at base 5. R. floribunda. 



Leaves rounded to acute at base. 



Larger leaves cuneate-attenuate at base 6. R. cuneata. 



Larger leaves rounded at base 7. R. sarmentosa. 



Stems terete or with 6 or more angles. 



Stems glabrous or very minutely puberulent. 



Peduncles filiform, much elongate and exceeding the bracts, 1 to 3-flow- 



ered 8. R. equisetiformis. 



Peduncles short, the primary ones shorter than the subtending leaflike 

 bracts, several or many-flowered. 



Stems, at least the older ones, terete 9. R. multiflora. 



Stems conspicuously angulate. 



Stems very minutely puberulent 10. R. obtusata. 



Stems glabrous. 



Corolla 11 to 12 mm. long 11. R. trachypleura. 



Corolla 15 to 18 mm. long 12. R. verticillata. 



Stems tomentose or pilose, the hairs conspicuous. 



Larger stems conspicuously angulate 13. R. polyedra. 



Larger stems terete or nearly so. 



Leaves entire 14, R. purpusii. 



Leaves serrate or crenate. 



Leaves cordate and clasping at base 15. R. rotundifolia. 



Leaves obtuse or acute at base. 



Corolla 8 to 9 mm. long 16. R. tepicensis. 



Corolla about 14 mm. long 17. R, pringlei. 



1. Russelia subcoriacea Robins. & Seat. Proc. Amer. Acad. 28: 113. 1893. 



Type from Tamasopo Canyon, San Luis Potosf. 



Plants glabrous ; leaves very short-petiolate, ovate. 6 cm. long, acuminate, 

 lustrous above; calyx lobes acuminate. 



