GREENMAN. — NEW ANGIOSPERMS FROM MEXICO. 107 



late on the margins, glabrous on the surface, at maturity 3 to 4 mm. in 

 length. ? Aspilia pachyphytta, Klatt, Leopoldina, xxiii. 143 (reprint, 

 p. 4). — Mexico. State of Oaxaca : near Totontepec, altitude 1125 to 

 1625 m., 15 to 28 July, 1894, E. W. Nelson, no 829 (lib. Gr., and lib. 

 U. S. Nat. Mus.). 



But for the fertile ray-flowers and the diverse habit the plant here 

 described might be referred to the genus Viguiera. From Encelia it 

 differs in the character of the ray-flowers, and in the distinctly 4-angled 

 achenes of the disk-flowers. From Verbesina it differs in the achenial 

 characters, namely, in being 4-angled and not distinctly winged, and also 

 in the nature of the pappus. Although bearing a certain affinity with 

 the three genera here mentioned, it differs in the important characters 

 enumerated, hence it seems best to give it generic rank with a position 

 in the natural sequence near Viguiera. 



The genus is dedicated to Dr. Fernando Altamirano, Professor at the 

 School of Medicine, and Director of the National Medical Institute, 

 City of Mexico. 



Helianthus oaxacanus. Stems striate, terete and glabrous below, 

 subangled and minutely appressed-puberulent above, especially in the 

 inflorescence : leaves alternate (at least the upper ones), petiolate, broadly 

 ovate, acute, 4 to 14 cm. long, 2 to 8 cm. broad, dentate to subentire, 

 often revolute-margined, rounded or abruptly narrowed at the base into 

 a 1 to 3.5 cm. long petiole, glabrous or essentially so on both surfaces, 

 3-nerved : inflorescence a terminal comparatively few-headed leafy pan- 

 iculate cyme : heads large, 1.5 to 2 cm. high, including the rays 4 to 

 5 cm. in diameter: involucre campanulate; bracts of the involucre 

 2-3-seriate, imbricated, lanceolate, acuminate, acute ; the outer bracts 

 shorter than the inner ones; ray-flowers 12 to 15, neutral; rays yel- 

 low, oblong, 1.5 cm. or more long, 6 to 7 mm. broad: disk-flowers 

 numerous : pappus of two rather large unequal paleaceous awns with 

 Bmaller intermediate persistent erose scales: achenes appressed-sericeous 

 pubescent. — Mexico. Between Huajuapam, State of Oaxaca, and 

 Retlatzingo, State of Puebla, altitude 1450 to 2000 m., 19 November, 

 1894, E. W. Nelson, no. 1985 (lib. Gr., and hb. U. S. Nat. Mus.). 



Helianthus pktiolauis, Nutt. Jour. Acad. Phil. ii. 115. Speci- 

 mens referable to this species were collected by Townsrnd &• Barber in 

 the Sierra Madre near Rio de Aroz, State of Chihuahua, Mexico, alti- 

 tude' 2300 m., 3 September, 1899, no. 403 (hb. Gr.). The specimens at 

 hand agree well with tin; more northern representatives <>f the species, 

 except for the somewhat narrower involueral bracts in which character 

 they approach the variety canescens. 



