STANDLEY TREES AND SHRUBS OF MEXICO 1555 



35. Perymenium ovatum T. S. Brandeg. Zoe 5: 261. 1908. 



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



Small shrub; branches strigose or short-hispid; leaves short-petioled, ovate, 

 1.5 to 3 cm. long, 0.8 to 1.5 cm. wide, obtuse, serrate, rugose and scabrous above, 

 densely subtomentose-hispidulous with bluish white hairs beneath; heads 1 to 3, 

 terminating the branches, the pedicels 0.5 to 2.5 cm. long; involucre 7 to 8 mm. 

 high, the phyllaries ovate to oblong, obtuse or the outer acutish, pubescent and 

 ciliate. 



36. Perymenium acuminatum (Llave) Blake, Contr. U. S. Nat. Herb 22: 

 627. 1924. 



Oteiza acuminata Llave, Reg. Trim. 1: 41. 1832. 



Galea elegans DC. Prodr. 5: 674. 1836. 



San Luis Potosi and State of Mexico. 



Suffrutescent; stem glabrous or sparsely pubescent; leaves subsessile or very 

 short-petioled, lance-ovate or ovate, 3 to 6 cm. long, 1.2 to 2.8 cm. wide, acumi- 

 nate, rounded to subcordate at base, callous-denticulate or subentire, smooth 

 above, strigose or antrorse-hirsute on the veins beneath; heads 2 to 3.5 cm. wide, 

 few on very long peduncles, or several and closely cymose-panicled; rays white; 

 involucre 7 to 9 mm. high, the phyllaries many-nerved, with subscarious, often 

 purplish tips, the outer acute, the inner obtuse or rounded. 



37. Perymenium macrocephalum Greenm. Proc. Amer. Acad. 39: 108. 1903. 

 Guerrero; type from Iguala. 



Herbaceous or suffrutescent (?), 1 to 2 meters high; stem slender, strigillose or 

 hispidulous; petioles of the larger leaves 1 to 3 cm. long; blades ovate, 6 to 12 

 cm. long, 3.5 to 7 cm. wide, acuminate, rounded to subcordate at base, serrate, 

 rough above, hispid and hispidulous beneath chiefly on the veins; heads few,, 

 large, on pedicels 2 to 8.5 cm. long; involucre 7 to 9 mm. high. 



38. Perymenium nelsonii Robins. & Greenm. Proc. Amer. Acad. 34: 529. 



1899. 



Chiapas; type collected between San Crist6bal and Teopisca. 



Shrub; branches strigose to sordidly subtomentose; petioles 1.2 to 2 cm. long; 

 blades ovate, 6 "to 10 cm. long, 3.2 to 5.5 cm. wide, acuminate, rounded or sub- 

 cordate at base, serrate, rough above, rather densely pilosulous to subtomentose 

 beneath; heads cymose or cymose-panicled, large, about 3 cm. wide; involucre 

 8 to 11 mm. high, the phyllaries obtuse or rounded. 



39. Perymenium latisquamuna Blake, Contr. U. S. Nat. Herb. 22: 626. 1924. 

 Chiapas; type from Sierra de Tonala. El Salvador. 



Probably shrubby; stem strigillose; petioles 8 to 27 mm. long; blades broadly 

 ovate, 6 to 13 cm. long, 4.5 to 7.5 cm. wide, acuminate, cuneate to subtruncate 

 at base, serrate, roughish above, strigose or antrorse-hispid, chiefly along the 

 veins, beneath and more or less gland-dotted; heads rather numerous, large, 

 about 2.8 cm. wide; involucre 8 to 10 mm. high, the phyllaries broadly ovate 

 (outermost) to broadly oval or suborbicular, broadly rounded or the outermost 

 obtuse. " Tatascamito " (El Salvador). 



DOUBTFUL SPECIES. 



Perymenium barclayanum DC. Prodr. 5: 609. 1836. Described as suffru- 

 ticose and subscandent. According to Robinson & Greenman, it is very close 

 to P. tenelliim A. Gray, an herbaceous species. 



Perymenium cervantesii DC. Prodr. 5: 609. 1836. This may be the same 

 as P. rude Roljins. & Greenm. 



Perymenium gymnolomoides (Less.) DC. Prodr. 5: 609. 1836. Lipotriche 

 gymaolomoides Less. Linnaea 6: 408. 1831. Lnperfectly described; type from 

 Misantla, Veracruz. 



