108 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Helianthus petiolaris, Nutt., var. canescens, Gray, PL Wright. 

 i. 108; Syn. Fl. i. pt. 2, 272. Mr. E. W. Nelson collected near Casas 

 Grandes, State of Chihuahua, Mexico, 30 August, 1899, specimens 

 under no. 6328 (lib. Gr., and hb. U. S. Nat. Mus.), which, except for a 

 slightly more pronounced dentation of the leaves, accord well with the 

 type of the above variety. 



The locality not only extends considerably the geographical range of 

 the variety canescens, but adds another Helianthus not hitherto recorded 

 from Mexico. 



Perymenium macrocephalum. Stout herbaceous perennial, pu- 

 bescent throughout with more or less spreading stiff hairs ; stem and 

 branches mottled with reddish-brown patches : leaves opposite, petiolate, 

 ovate, 5 to 10 cm. long, 3 to 7 cm. broad, acuminate, acute, rather 

 remotely and shallowly dentate, rounded or cuneate at the base, hispid 

 above, paler and hirsute-hispid on the conspicuously reticulated veins 

 beneath ; petioles 0.5 to 2.5 cm. long, narrowly winged by a continuous 

 prolongation of the leaf -blade : heads few, on long peduncles 1 to 10 

 cm. in length ; scales of the involucre 3-4-seriate, ovate to oblong, 

 obtuse, externally appressed-pubescent, ciliate, the outer shorter : ray- 

 flowers about 13, fertile ; rays yellow: disk-flowers numerous: mature 

 achenes 4 to 5 mm. long, somewhat roughened on either surface : pales 

 of the receptacle conspicuous, especially in the later stages. — Mexico. 

 State of Guerrero: limestone mountains above Iguala, altitude 1230 in., 

 27 September, 1900, C. G. Pringle, no. 8416 (hb. Gr.). This species 

 suggests in some respects Montanoa macrolepis, Rub. & Greenm., but in 

 the technical characters it is quite distinct. 



Perymenium rude, Rob. & Greenm., Proc. Am. Acad, xxxiv. 526. 

 Specimens collected near Tequila, State of Jalisco, Mexico, 5-6 July, 

 1899, by Dr. J. N. Rose $ Mr. Walter Hough, no. 4749 (lib. Gr., 

 and lib. U. S. Nat. Mus.), agree in all essential details with the original 

 specimen, and with the first published description of this species. In the 

 above cited number, however, the leaves are often 4 cm. in length, and 

 3 cm. in breadth, thus somewhat larger than was indicated in the original 

 description. 



Spilanthes disciformis, Rob., var. phaneractis. Stems ascend- 

 ing, 2.5 to 8 dm. long, rooting at the lower nodes : leaves narrowly 

 lanceolate, 8 cm. or less in length, 8 mm. in breadth : peduncles slender, 

 7 to 13 cm. long: rays conspicuous, sulphur-yellow, 5 to 6 mm. long, 

 2 to 3 mm. broad. — Mexico. State of Michoacan: swamps, Zamora, 

 altitude 1540 in., 1901, and 24 July, 1902, C, G. Pringle, nos. 9539, 8637 

 (hb. Gr.). 



