1552 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



14. Perymenium berlandierii DC. Prodr. 5: 608. 1836. 



Perymenium mendezii cylindrocephalum Robins. & Greenm. Proc. Amer. Acad. 

 34: 528. 1899. 



Hidalgo to Morelos and Puebla; Chiapas; type from Villalpando. 



Shrub, up to 4 meters high, strigose and strigillose; leaves short-petioled, lance- 

 ovate or ovate, 3.5 to 8 cm. long, 1 to 4 cm. wide, acute or acuminate, cuneate 

 to rounded at base, rather thick, serrate or serrulate; heads usually in close 

 terminal cymes, often surpassed by the leaves; involucre 3 or 4-seriate, 5 to 8 

 mm. high, the phyllaries mostly oval or oblong, obtuse or rounded. 



15. Perymenium purpusii T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 74. 1914. 

 Perymenium leptopodum Blake, Proc. Amer. Acad. 51: 523. 1916. 

 Chiapas; type from Cerro del Boqueron. Guatemala. 



Shrubby, 2 meters high, rather sparsely strigose and strigillose; petioles usually 

 1 to 1.6 cm. long; blades mostly oblong-ovate or lance-ovate, 4.6 to 8.5 cm. long, 

 1.5 to 4 cm. wide, acute or acuminate, cuneate or rarely rounded at base, serrate; 

 heads usually rather numerous, cymose, on pedicels 0.5 to 3.2 cm. long; involucre 

 4 to 5 mm. high, the phyllaries ovate, obtuse to acute. 



16. Perymienium microphyllum Robins. & Greenm. Proc. Amer. Acad. 34: 

 527. 1899. 



Durango, without definite locality. 



Shrub; branches strigillose; leaves short-petioled, linear or linear-elliptic, 1.2 

 to 2.4 cm. long, 2 to 4 mm. wide, acute, entire, revolute-margined, scabrous; 

 heads scattered, axillary and terminal, small, the pedicels 7 mm. long; involucre 

 7 mm. high, the phyllaries ovate or lanceolate, the tips herbaceous, loose, obtuse 

 to acute. 



17. Perymenium goldmanii Greenm. Field Mus. Bot. 2: 269. 1907. 



Known only from the type locality, Apazote, near Yohaltiin, Campeche. 



Shrubby; stem strigillose; petioles 3 to 12 mm. long; blades ovate or lance- 

 ovate, 4.5 to 8 cm. long, 2 to 4 cm. wide, acuminate, broadly rounded to sub- 

 cordate at base, crenate-serrate to subentire, rough above, hirsute and hir- 

 sutulous beneath and dotted with shining glands; heads small, few or numerous 

 in close cymose clusters; involucre 4 mm. high, the phyllaries acute to obtusish, 

 somewhat dotted with shining glands. 



18. Perymenium pinetorum T. S. Brandeg. Univ. Calif. Publ. Bot. 10: 420. 

 1924. 



Known only from the type locality, near Hacienda Monserrate, Chiapas. 



Branching shrub, the stem strigillose; leaves short-petioled, the blades ovate 

 or oval-ovate, 2.5 to 3.8 cm. long, 1 to 1.6 cm. wide, acute, rounded at base, 

 serrulate, rough-strigillose on both sides, green and scarcely paler beneath; 

 heads few, small, in small terminal cymose clusters, the pedicels 3 mm. long or 

 less; involucre 4 mm. high, the phyllaries acute or subacuminate, strigillose; 

 rays about 3, about 3 mm. long; disk flowers about 7. 



19. Perymenium rotundisquamum Blake, Contr. U. S. Nat. Herb. 22: 623. 

 1924. 



Known only from the type locality, Vallecito, Michoac^n or Guerrero. 



Suffrutescent, tufted; stems strigillose, simple, remotely leafy; leaves short- 

 petioled, the blades lance-oblong or oblong, 3 to 4.8 cm. long, 1 to 1.5 cm. wide, 

 acute, cuneate at base, serrulate, scabrous above, beneath strigillose and pro- 

 minulous-reticulate; heads in small cymes at apex of stem and on subterminal 

 peduncles; involucre about 4 mm. high, the inner phyllaries suborbicular, broadly 

 rounded. 



20. Perymenium lancifolium Blake, Contr. U. S. Nat. Herb. 22: 623. 1924. 

 Known only from the type locality, Batel, Concordia, Sinaloa. 



