254 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Acliaetogeron 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 subpinnatiiid 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, wbite 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 cpaite 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. G. 

 Pringle, no. 8851 (lib. Gr.). 



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 : 

 leaves of the offsets and the lower stem-leaves oblanceolate to spatulate, 

 3 to 8 cm. long, 0.5 to 1.5 cm. 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 

 3 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 an incou-' 

 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 between 

 A. Wislizeni and A. griseus may be found, but until such are known to 

 occur it seems best to regard them as distinct species. 



