1554 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



28. Perymenium stenophyllum Blake, Proc. Biol. Soc. Washington 32: 

 191. 1919. 



Known only from the type localitj'^, San Ignacio, Sinaloa. 



Shrubby; branches strigose and strigillose; leaves short-petioled, narrowly 

 linear, 3 to 15 cm. long, 1 to 4 mm. wide, acuminate at both ends, 1-nerved, 

 roughish above, densely and finely canescent-tomentulose beneath; heads in 

 terminal clusters of 3 to 7, the pedicels 3 to 40 mm. long; involucre 4 to (fruit) 

 7 mm. high, the phyllaries obtuse to rounded. 



29. Perymenium angustifolium T. S. Brandeg. Zoe 5: 260. 1908. 

 Puebla; type from Cerro San Luis. 



Shrub; branches strigose; leaves short-petioled, elliptic-lanceolate, 2 to 5 cm. 

 long, 4 to 7 mm. wide, usually obtusish, cuneate at base, serrate, rough and 

 rugose above, beneath densely and canescently or cinereously subtomentose- 

 hispidulous; heads in small terminal cymes or cymose panicles; involucre 5 to 6 

 mm. high, the phyllaries acute" or acuminate. 



30. Perymenium lasiolepis Blake, Contr. U. S. Nat. Herb. 22: 625. 1924. 

 Known only from the type locality, San Sim6n, Puebla. 



Shrub; branches spreading- hispidulous; leaves short-petioled, rhombic-ovate, 



2 to 3.3 cm. long, 1 to 1.8 cm. wide, acutish, rounded-cuneate at base, hispid- 

 pilose above, beneath densely and canescently pilose-tomentose; heads in rather 

 small panicles; involucre 6 to 7 mm. high, the phyllaries lance-ovate, acuminate, 

 spreading-tipped, densely pubescent. 



31. Perymenium blepharolepis Blake, Proc. Amer. Acad. 51: 522. 1916. 

 Known only from the type locaUty, Coxcatldn, Puebla. 



Shrub; branches strigillose; leaves short-petioled, ovate, 2.5 to 3.8 cm. long, 

 1 to 1.8 cm. wide, subacuminate, cuneate or rounded-cuneate at base, above 

 strigillose, beneath subcanescently antrorse-hispid and hispidulous; heads 5 to 

 7, cymose-panicled; involucre 7 mm. high, the ph3dlaries ovate to lance-ovate, 

 subacute. 



32. Perymenium hypoleucum Blake, Proc. Amer. Acad. 51: 523. 1916. 

 Known definitely only from the type locality, San Luis Tultitlanapa, Puebla. 

 Shrub; branches strigillose; leaves short-petioled, ovate or elliptic-ovate, 2 to 



3 cm. long, 1 to 2 cm. wide, obtuse to acute, cuneate-rounded at base, harsh 

 above, densely and glaucescently subtomentose-hispidulous beneath; heads 

 several, closely cymose-panicled; involucre 4 to 4.5 cm. high, the phyllaries 

 densely strigillose, obtuse or rounded. 



33. Perymenium consobrinum Blake, Contr. U. S. Nat. Herb. 22: 626. 1924, 

 Known only from the type locality, Los Naranjos, Oaxaca. 



Shrubby; branches reflexed-hispidulous; leaves short-petioled, ovate or lance- 

 ovate, 2.5 to 4 cm. long, 1.2 to 2 cm. wide, acute, cuneate at base, roughish and 

 rugose above, beneath densely and subtomentosely hispid-pilose with glaucescent 

 hairs; heads about 5, in umbelUform cymes, on pedicels 1 to 5 cm. long; involucre 

 about 6 mm. high, the phyllaries obtuse, with spreading herbaceous tips. 



34. Perymenium coUinum T. S. Brandeg. Univ. Calif. Publ. Bot. 3: 395. 

 1909. 



Known onlj' from the type locality, Cerro de Gentile, Puebla. 



Shrub; branches subtomentose-pilosulous with spreading hairs; leaves short- 

 petioled, broadly ovate, 1 to 1.8 cm. long, 8 to 14 mm. wide, acute, at base 

 rounded or subcordate, harsh above, densely and ochroleucously subtomentose- 

 hispidulous beneath; heads 3 to 5, short-pediceled; involucre 7 mm. high, the 

 phyllaries ovate, olstuse, pubescent. 



