1310 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



10. Busselia obtusata Blake, Proc. Biol. Soc. Washington 33: 119. 1920. 

 Puebla and Oaxaca ; type from Tehuacan, Puebla. 



Stems with much thickened, obtuse angles ; leaves short-petiolate, ovate or 

 elliptic, 3 cm. long or less, obtuse, crenate or serrate, obtuse or acute at base ; 

 calyx lobes acute ; corolla 12 to 14 mm. long. 



11. Russelia trachypleura Robinson, Proc. Amer. Acad. 36: 474. 1901. 

 Type from Sierra de Tepoxtlan, Morelos, altitude 2,250 meters. 



Stems 6-angulate, the angles roughened by small callosities; leaves short- 

 petiolate, opposite or ternate, elliptic-ovate, 3 cm. long or less, obtuse or acute, 

 serrate ; calyx lobes caudate-acuminate. 



12. RusseUa verticillata H. B. K. Nov. Gen. & Sp. 2: 360. 1817. 

 Russelia deamii Robinson, Proc. Amer. Acad. 36: 474. 1901. 



Chihuahua and Durango to Guerrero and Morelos; type from Puente de la 

 Madre de Dios. Central America. 



Stems 6-angulate ; leaves short-petiolate, ovate or elliptic, 2.5 cm. long or less, 

 obtuse or acute, thin, serrate, glabrous or villous. 



RusseUa deamii is a form with villous leaves. It may be specifically distinct, 

 but it seems more probable that it Is only a form of R. verticillata. 



13. Russelia polyedra Zucc. Abh. Akad. Wiss. Muenchen 2: 328. 1832-36. 

 Russelia retrorsa Greene, Pittonia 1: 176. 1888. 



Baja California and Sonora to Tamaulipas, Veracruz, and Chiapas. Central 

 America. 



Plants suffrutescent, 2.5 meters high or less, the stems 6-angulate, sparsely or 

 densely pubescent ; leaves short-petiolate, ovate or broadly ovate, 6 cm. long 

 or less, acute, rounded to acute at base ; corolla about 1.5 cm. long. " Hierba 

 de la suefia " (Tamaulipas) ; "coral de la playa," "coral" (Oaxaca). 



It is probable that the proper name for this species is R. ternifolia H. B. K.» 

 The description of that species agrees well with R. polyedra except that the 

 leaves are described as larger than in any specimens seen by the writer. 



14. Russelia purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 385. 1913. 

 Type from Banos del Carrizal, Veracruz. 



Branches densely pubescent ; leaves ovate, 6.5 cm. long or less, acuminate, 

 subcordate at base, short-petiolate, pubescent beneath ; calyx lobes ovate, 

 subulate-acuminate ; corolla about 1.5 cm. long. 



15. Russelia rotundifolia Cav. Icon. PI. 5: 9. pi. ^15. 1799. 

 Guerrero. 



Shrub, the branches densely pubescent ; leaves reniform to rounded-ovate, 

 sessile, 8 cm. long or less, obtuse or rounded at apex, coriaceous, densely 

 pubescent beneath and with prominent and reticulate venation ; corolla about 

 1 cm. long. 



16. Russelia tepicensis Robinson, Proc. Amer. Acad. 35: 321. 1900. 

 Russelia furfuracea T. S. Brandeg. Zoe 5: 219. 1905. 



Sinaloa and Tepic ; type from Zopilote, Tepic. 



Stems striate, densely pubescent ; leaves sessile or short-petiolate, mostly 

 ternate, ovate to rounded-ovate, 4.5 cm. long or less, obtuse, rounded to acute 

 at base, crenate or serrate ; flowers in short dense cymes. 



17. Russelia pringlei Robinson, Proc. Amer. Acad. 43: 26. 1907. 



Guerrero ; type from limestone cliffs of Iguala Canyon, altitude 750 meters. 



Plants 1 to 2 meters high, the stems densely pubescent, striate ; leaves short- 

 petiolate. ovate, 1 to 1.5 cm. long, acute, serrate, densely glandular beneath ; 

 cymes short, few-flowered. 



1 Nov. Gen. & Sp. 2: 359. 1817. 



