256 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Gray (Erigeron Seemannii, Greene), from which, however, it differs in 

 the character of the foliage, the number of ray-flowers, and in other tech- 

 nical characters of the head. E. alcicomutus has the leaves relatively 

 broad at the base, and this breadth is retained up to the point of laciniation, 

 not gradually narrowed to a subamplexicaul base. Moreover, the rays are 

 more numerous, longer and narrower than in the Seemann plant, and 

 the achenes again are smaller and quite glabrous. On account of the 

 simple setose pappus with comparatively few setae Mr. Priugle's plant 

 above cited seems to the writer best referred to Erigeron, related to 

 E. neo-mexicanus, Gray, and E. delphinifolius, Willd. 



Erigeron calcicola, n. sp. Suffruticose: stems several from a stout 

 ligneous base, erect or nearly so, 1.5 to 3 dm. high, usually branched, 

 pubescent with short spreading or slightly reflexed somewhat crisp hairs: 

 leaves spatulate to linear, 0.5 to 2.5 cm. long, 1 to 5 mm. broad, acute or 

 obtusish, entire or the lower ones few-toothed, pubescent on both surfaces : 

 peduncles 10 cm. or less in length, hirtellous-hirsute with short spreading 

 or somewhat reflexed hairs : heads 6 to 9 mm. high, including the rays 

 1.5 to 2 cm. in diameter: involucre campanulate, a little shorter than 

 the flowers of the disk: bracts of the involucre lanceolate, acute, more 

 or less scarious-margined, hirtellous-hirsute : ray-flowers numerous, sub- 

 biseriate ; rays narrow, white or faintly tinged with purple : disk-flowers 

 many : pappus double, consisting of long slender setae and of short 

 laciniate squarnellae, similar in both disk- and ray-flowers but somewhat 

 shorter in the latter: mature achenes 1 to 1.5 mm. long, pubescent 

 under a lens. — Mexico. State of Hidalgo : calcareous bluffs near 

 Tula, altitude 2070 m., 11 September, 1899, C. G. Pringle, no. 8223 

 (hb. Gr.); chalk bluffs, altitude 2070 m., 16 September, 1902, C. G. 

 Pringle, no. 9899 (hb. Gr.). State of San Luis Potosi : 22° N. Lat., 

 altitude 1800-2400 m., Parry $ Palmer, no. 391 (hb. Gr.). Slate of 

 Coahuila: Saltillo, 15-30 April, 1898, Br. Edward Palmer, no. 20 

 (hb. Gr.). 



E. calcicola resembles E. pubescens, HBK. (E. Ervendbergii, Gray), 

 but differs in having a stouter more distinctly ligneous base, and a 

 spreading or somewhat reflexed pubescence on the stem and peduncles 

 not upwardly appressed or strigillose. 



Erigeron morelensis, n. sp. Perennial : stem scapiform, slender, 

 more or less flexuous, 1.5 to 2.5 dm. in length, bearing 3 to 5 linear 

 acute bracts between the leafy base and the solitary terminal head, striate, 

 green or slightly purplish, sparingly pubescent: leaves at the base of the 

 stem crowning the oblique rootstock, petiolate, lanceolate to somewhat 



