254 PROCEEDINGS OF THE AMERICAN ACADEMY, 
Achaetogeron ascendens, n.sp. An herbaceous perennial: stems 
several from a common ligneous base, subprostrate or ascending, 1 to 
2 dm. in length, subappressed-hispidulous-pubescent : leaves sessile, linear 
and entire to subpinnatifid with short linear-acute or obtusish divisions, 
1 to 2 cm. long, 1 to 5 mm. broad, hirsute-hispid: peduncles 1 to 5 cm. 
in length, sparingly pubescent with appressed or subappressed stiffish 
hairs: heads including the fully expanded rays 2 to 2.5 cm. in diameter: 
involucre campanulate, about 5 mm. high; bracts of the involucre in 2 to 
3 series, linear or linear-lanceolate, scarious-tipped and acute, narrowly 
scarious-margined, hirsute-pubescent, more or less purplish: ray-flowers 
2-3-seriate, numerous, fertile; rays including the tubular portion 7 to ~ 
9 mm. long, less than 1 mm. broad, white or roseate: disk-flowers many: 
pappus of both ray- and disk-flowers a laciniated crown of coalescent 
scales, mostly less than 1 mm. long, nearly or quite equalling the short 
tube of the corolla: mature achenes about 1 mm. long, laterally com- 
pressed, sparingly pubescent. — Mexico. State of Hidalgo: meadows 
near Buena Vista Station, altitude 2530 m., 4 August, 1904, C. @. 
Pringle, no. 8851 (hb. Gr.). f 
Achaetogeron griseus, n. sp. An herbaceous perennial: stem 
erect, branched, about 3 dm. high, bearing several offsets at the base, 
green, striate, pubescent with appressed or subappressed grayish hairs: é 
leaves of the offsets and the lower stem-leaves oblanceolate to spatulate, 
3 to 8 cm. long, 0.5 to 1.5 em. broad, obtuse or submucronate-acute, en- = 
tire to more or less pinnatifid with oblong obtuse lobes, narrowed below 
to a subpetiolate base, subappressed-pubescent on both surfaces; upper 
stem-~ and rameal-leaves narrowly oblanceolate to lance-linear, entire: 
heads on rather long very pubescent peduncles, including the rays 2.5 to 
5 cm. in diameter: involucre campanulate; bracts of the involucre lance- _ 
attenuate, narrowly scarious-margined and purplish, pubescent with sub- 
appressed hairs: ray-flowers numerous; rays including the tube about 
1.5 cm. long, 1 mm. broad, white: disk-flowers many: pappus a0 incon- 
spicuous fringed crown: achenes of both ray- and disk-flowers laterally 
compressed, slightly pubescent.— Mexico. State of Durango: vicinity 
of the city of Durango, April to November, 1896, Dr. Edward Palmer, 
no. 821 (hb. Gr., and hb. U. S. Nat. Mus.). The affinity of this species 
is with A. Wislizeni, Gray, but the leaves are more or less pinnatifid, the _ 
pubescence in general is less spreading, the involucral bracts are purplish, 
and the pappus is much more reduced. Intermediate forms betwee? — 
A. Wislizeni and A, griseus may be found, but until such are known to 
occur it seems best to regard them as distinct species. 
