STANDLEY TREES AND SHRUBS OF MEXICO 1551 



rounded at base, serrulate, roughish on both sides; heads 3 or 4 toward tips of 

 branches, axillary and terminal, long-peduncled; involucre about 5 mm. high, 

 the phyllaries obtuse or rounded, with obscurely herbaceous tips. 



7. Perymenium cornutum T. S. Brandeg. Univ. Calif. Publ. Bot. 4: 192. 



1911. 



San Luis Potosi; type from Agua Media. 



Suffrutescent or "herbaceous," 35 cm. high and more, hispidulous-strigillose 

 and somewhat glandular; petioles 4 to 10 mm. long; blades ovate or lance-ovate, 

 4 to 5.5 cm. long, 2 to 3 cm. wide, serrate or serrulate; peduncles 2.5 to 9 cm. 

 long; involucre 5 to 7 mm. high, the phyllaries ovate, the inner or all acute or 

 acutish. 



8. Perymenium rude Robins. & Greenm. Proc. Amer. Acad. 34: 526. 1899. 

 Puebla, Morelos, and Oaxaca; type from Las Sedas, Oaxaca. 



Shrub 1 to 2 meters high, strigose and strigillose; leaves short-petioled, the 

 blades ovate, 2 to 4.5 cm. long, 1 to 2.3 cm. wide, acute, rounded-cuneate to 

 subtruncate at base, serrate, green and rough above, beneath paler green and 

 rather densely hispidulous with chiefly antrorse hairs; heads about 1.8 cm. wide, 

 few, cymose, and rather long-peduncled, or more numerous and cymose-panicled; 

 involucre 4 to 7 mm. high, the phyllaries chiefly obtuse. 



9. Perymenium pringlei Robins. & Greenm. Proc. Amer. Acad. 34: 526. 



1899. 



Sinaloa and Jalisco; type from Guadalajara, Jalisco. 



Shrubby; stem strigose or strigillose; petioles 5 to 20 mm. long; blades ovate, 

 6 to 11 cm. long, 2 to 4 cm. wide, acuminate, coarsely serrate to subentire, harsh 

 on both sides, beneath venose, hispid, and hispidulous; heads cymose-panicled; 

 involucre 6 to 7 mm. high, the phyllaries obtuse or subacute. "Guisandira" 

 (Sinaloa). 



10. Perymenium globosum Robinson, Proc. Amer. Acad. 43: 40. 1907. 

 Known only from the type locality, Uruapan, Michoacdn. 



Shrubby, 2 meters high; stem strigillose; petioles 8 to 15 mm. long; blades 

 ovate, 8 to 12 cm. long, 4 to 5 cm. wide, acuminate, rounded or shortly cuneate 

 at base, closelj' serrate, roughish on both sides, prominulous-reticulate beneath 

 and there hispidulous and gland-dotted; heads numerous; involucre short, 3 mm. 

 high, the phyllaries ovate, acute or acuminate. 



11. Perymenium verbesinoides DC. Prodr. 5: 608. 1836. 

 Hidalgo to Guerrero; type from Mexico, without definite locality. 

 Shrubby, up to 2.6 meters high; stem strigose and strigillose; petioles 2 to 13 



mm. long; blades ovate, 2.5 to 8.5 cm. long, acute or acuminate, truncate to 

 subcuneate at base, serrate, rough above, antrorse- or divergent-hispidulous 

 beneath; heads usually in small close cymose panicles; involucre 5 to 7 mm. 

 high, the phyllaries ovate, acute or usually acuminate. 



12. Perymenium asperifolium Schultz Bip.; Klatt, Leopoldina 23: 143. 

 1887. 



Known only from the type locality, Ejutla, Oaxaca. 



Leaves short-petioled, 3.7 cm. long, 1.8 cm. wide, cordate, scabrous above, 

 villous beneath; heads c>-mose; phyllaries 2-seriate, oblong-lanceolate, acute, 

 densely villous. (Description compiled.) 



13. Perymenium glandulosum T. S. Brandeg. Zoe 5: 261. 1908. 

 Known only from the type locality, Barranca de Tlacuilosto, Puebla. 



Small shrub; younger branches, leaves, and involucre very glandular and more 

 or less hispid or strigose; leaves short-petioled, lanceolate or lance-elliptic, 

 cuneate at base, 2 to 3.5 cm. long, 6 to 11 mm. wide, scabrous-pubescent; heads 

 several, closely cymose, short-pedicelled; involucre 5 to 6 mm. high, the inner 

 phyllaries long-acuminate, spreading at apex. 

 57020—26 -16 



