256 PROCEEDINGS OF 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. £. alcicornutus 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. Pringle’s plant 
above cited seems to the writer best referred to Hrigeron, related to 
Li. 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 em. 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 squamellae, 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, Ci 
Pringle, no. 9899 (hb. Gr.). State of San Luis Potosi: 22° N. Lat., 
altitude 1800-2400 m., Parry & Palmer, no. 391 (hb. Gr.). State of 
Coahuila: Saltillo, 15-30 April, 1898, Dr. Edward Palmer, no. 20 
(hb. Gr.). 
£. calcicola resembles E. pubescens, HBK. (E. Ervendbergit, 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 2 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 
