1612 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



Tepic to Veracr.uz and Oaxaca; type from Valladolid (Morelia), Michoacdn. 



Shrub up to 1.5 meters high; leaves chiefly alternate, the blades oval, 1.5 to 

 4.5 cm. long, 1 to 3.5 cm. wide, pale green, marginate; heads 1.4 to 2 cm. long; 

 phyllaries with a median row of glands. 



2. Porophyllum nutans Robins. & Greenm. Proc. Amer. Acad. 32: 31. 1896- 

 Porophyllum holwayanum Greenm. Proc. Amer. Acad. 40: 48. 1904. 

 Jahsco to Oaxaca; type from Lake Chapala, Michoacdn. 



Shrubby, 1 to 2 meters high; leaf blades oval or oblong-elKptic, 2 to 5 cm- 

 long, scarcely marginate, glandular along the margin; phyllaries with 2 rows of 

 linear glands. 



3. Porophyllum nelsonii Robins. & Greenm. Proc. Amer. Acad. 32: 32. 1896- 

 Oaxaca; type collected between Panixtlahuaca and Jaquila. 



Shrubby, 0.3 to 0.6 meter high; leaf blades elliptic or oblong, 1 to 1.8 cm. long, 

 4 to 6 mm. wide, obtuse, thickisii, with few glands; heads numerous, solitary in 

 forks of stem and at tips of branchlets, about 1.5 cm. high; involucre purplish 

 above; phyllaries with 2 rows of linear glands. 



4. Porophyllum joruUense (H. B. K.) Cass. Diet. Sci. Nat. 43: 57. 1826. 

 Kleinia joridlensis H. B. K. Nov. Gen. & Sp. 4: 156. j,l. 356. 1820. 

 Sinaloa to Jalisco; type from Volcdn de Jorullo. 



Shrubby; leaf blades oval, 1 to 2.5 cm. long, obtuse or rounded; heads 1.3 to 

 1.5 cm. high, on peduncles 2 to 4.5 cm. long; phyllaries with 2 rows of linear glands. 

 6. Porophyllum palmeri Rose, Contr. U. S. Nat. Herb. 1: 338. pZ. 5^. 1895. 



Known onh' from the type locality, Colima. 



Shrub; leaves opposite, the blades 1 to 4 cm. long; heads loosely cymose, about 

 15 mm. high; phyllaries with 2 rows of glands. 



6. Porophyllum oblongum Rydb. N. Amer. Fl. 34: 186. 1916. 

 Known only from the type locality, Culiacd,n, Sinaloa. 



Shrub; leaf blades 2 to 4 cm. long, 0.5 to 1.5 cm. wide, obtuse or rounded, 

 glandular on the repand-sinuate margin and usually on surface; heads cymose, 

 about 1.6 cm. high; phyllaries with about 3 rows of glands. 



7. Porophyllum ervendbergii A. Gray, Proc. Amer. Acad. 19: 35. 1883. 

 Definitely known only fom the type locality, Wartenberg, Veracruz. 



Shrub; leaves opposite, the blades eUiptic, 2 to 3 cm. long, obtuse, sinuate, 

 glandular on margin and surface; involucre 11 to 12 mm. high, the phyllaries 

 punctate in 2 rows. (Description compiled.) 



8. Porophyllum punctatum (Mill.) Blake, Contr. Gray Herb. n. ser. 52: 



58. 1917. 



Eupatorium punctatum Mill. Gard. Diet. ed. 8. Eupatorium no. 11. 1768. 



Porophyllum nurnmularium DC. Prodr. 5: 649. 1836. 



Eupatorium milleri Steud, Nom. Bot. ed. 2. 1: 608. 1840. 



Porophyllum millspaughii Robinson in Millsp. Field Mus. Bot. 2: 109. 1900. 



Porophyllum divaricatum Rydb. N. Amer. Fl. 34: 186. 1916. 



Sinaloa to Veracruz, Yucatan, and Oaxaca; type from Veracruz. Guatemala. 



Shrubby, up to 2.6 meters high; leaves opposite, the blades oblong or sometimes 

 eUiptic, 1 to 3.5 cm. long, obtuse or rounded, rarely acute, crenate, glandular on 

 margin and usually also on surface; heads cymose, 1.3 to 1.8 cm. high; phyllaries 

 with 2 rows of hnear glands. "Hierba del venado," "pioja," "piojillo" (Sinaloa); 

 "xpechuekil" (Yucatdn, Maya). 



9. Porophyllum brachypodum Robinson, Proc. Amer. Acad. 35: 341. 1900. 

 Known only from the type localit}^, Guaymas, Sonora. 



Shrubby; leaves alternate, short-petioled, the blades thick, those of the main 

 leaves lanceolate, 3 to 4 cm. long, 4 to 8 mm. wide, the others mostly linear; 

 heads densely cymose, about 1.5 cm. high; peduncles 5 to 8 mm. long. 



