STANDLEY TREES AND SHRUBS OF MEXICO 1613 



10. Porophyllum pausodynum Robins. & Greenm. Proc. Amer Acad 32- 

 32. 1896. 



Known only from the vicinity of the type locaHty, Guaymas, Sonora. 



Shrubby; leaves opposite below, alternate above, short-petioled, the blades 

 2.5 to 5.5 cm. long, 2 to 5 mm. wide, acutish, with intramarginal glands; heads 

 short-peduncled, 1.5 to 1.8 cm. high, in close cymes; phyllaries oblong, obtuse, 

 with 2 to 4 rows of glands; achenes not tapering at apex. " Maravilla." 



The plant is used as a remedy for headache. 



11. Porophyllum confertum Greene, Leaflets 2: 155. 1911. 

 Known only from the type locahty, Ceralvo Island, Gulf of California. 

 Suffrutescent, erect; leaves mostly alternate, subsessile, the blades linear, 4 to 



6 cm. long, less than 2 mm. wide; heads 1.3 cm. high; achenes tapering at apex. 



12. Porophyllum ochroleucum Rydb. N. Amer. Fl. 34: 189. 1916. 

 Porophyllum confertujn ochroleucum I. M. Johnston, Proc. Calif. Acad. IV 12: 



1209. 1924. 



Known only from the type locality, Saucito, Baja California. 



Shrubby, 0.5 meter high or more; leaves short-petioled, the blades narrowly 

 oblanceolate, 3 to 5 cm. long, 2 to 4 mm. wide; heads densely cymose; phyllaries 

 linear. (Description compiled.) 



13. Porophyllum cedrense Rose & Standi.; Rydb. N. Amer. Fl. 34: 189. 1916. 

 Known only from the type locality, Cedros Island, Baja California. 

 Diffusely branched shrub, under 0.5 meter high; leaves alternate, sessile, the 



blades oblong, 1 to 2 cm. long, 2 to 5 mm. wide, obtuse; heads usually solitary, 

 1.5 cm. high; phyllaries oblong. 



14. Porophyllum obtusifolium DC. Prodr. 5: 650. 1836. 

 Jalisco, Guanajuato, and Mexico; type from Villalpando. 



Suffruticose, about 0.5 meter high; leaves short-petioled, the blades oblanceo- 

 late or oblanceolate-linear, 2 to 4 cm. long, 2 to 8 mm. wide, mostly obtuse; 

 heads about 13 mm. high, cymose-panicled; involucre dark purplish; achenes 

 not tapering at apex. "Hierba del venado" (Guanajuato). 



15. Porophyllum linaria (Cav.) DC. Prodr. 5: 649. 1836. 

 Cacalia linaria Cav. Icon. PI. 3: 29. pi. 257. 1795. 



Hunteria columbina Moc. & Sesse; DC. Prodr. 5: 649. 1836, as synonym. 

 Porophyllum linarifoUum St. Lag. Ann. Soc. Bot. Lyon 7: 132. 1880. 

 Coahuila to State of Mexico; type from Mexico, without definite locality. 

 Similar to P. obtusifolium; leaves narrowly linear, 1 to 2 mm. wide; flowers 

 purple. 



16. Porophyllum seemannii Schultz Bip. in Seem. Bot. Voy. Herald 308. 

 1856. 



Sinaloa and Chihuahua to Jalisco; type from the Sierra Madre of northwestern 

 Mexico. 



Shrub; leaves opposite below, alternate above, short-petioled, the blades 2 to 

 5 cm. long, 2 to 5 mm. wide; heads 12 mm. high. "Hierba del venado" (Sinaloa); 

 "maravilla" (Sonora). 



Used as a remedy for malaria. 



17. Porophyllum porfyreum Rose & Standi.; Rydb. N. Amer. Fl. 34: 191. 

 1916. 



Known only from the type locality, San Jose del Cabo, Baja California. 



Shrubby, very slender; leaves linear-filiform, 3 to 7 cm. long, 1 mm. wide or 

 less; heads mostly solitary, 1.2 to 1.7 cm. high; involucre glaucous, purplish 

 above. 



