WESTERN SPECIES OF ARA.GALLU8. 63 



clothed with the scale-like bases of the dead stipules: stipules cov- 

 ered with coarse, white, straight hairs: scapes 2-4 dm. high 

 (including the spike), numerous, rather stout, at first scarcely 

 exceeding the leaves, elongating in fruit, thinly pubescent : leaves 

 very much crowded on the crowns, the longer reaching the base of 

 the spike; grayish with a short, appressed pubescence, leaflets 6- 

 10 pairs, oblong to lanceolate, sub-acute, 15-25 mm. long: bracts 

 lanceolate, shorter than the calyx-tube : calyx sericeous with some 

 short, black hairs intermingled, its linear teeth greenish and about 

 half as long as the tube: corolla white with a yellowish tinge which 

 deepens as the flowers dry, a purple spot on the keel, 20-25 mm. 

 long; wings broadly dilated (the blade almost as broad as it is 

 long), somewhat obliquely two-lobed by a broad, triangular notch : 

 pod pubescent, oblong, with a straight tip, at maturity about twice 

 (as long as the calyx, ventral suture somewhat intruded. 



At the time that I proposed this as a variety of A. Lamberti, 1. c, 

 I was satisfied that it was very different from that species. Further 

 field work and a large series of specimens make it certain that these 

 differences are specific. Much difficulty has arisen as to A. Lamberti 

 because of the attempts to hold these plants together. I know well 

 enough that color of flowers alone is not distinctive, but of a large 

 series of specimens of what I conceive to be typical A, Lamberti all 

 have purple or purplish flowers, while the species now proposed is 

 always, as to color, as given above. 



The two species are readily separated by the densely tufted habit 

 of A. albiflorus, its shorter, thicker spike, its hairy stipules and its 

 crowded leaves and scapes (rarely and only in young plants do we 

 find the tufts small or nearly simple). 



Besides repeated collections of this in the vicinity of Laramie, I 

 would refer here specimens by J. W. Blankinship, No. 146, Custer, 

 Mont.; E. V. Wilcox, Big Belt Mts., July 25, 1898; Mrs. M. L. 

 Ald'erson, Gallatin Co., Mont.; C. S. Crandall, mountains, Lari- 

 mer Co., Colo., June 24, 1896; Geo. E. Vasey, Colo., 1889: Pos- 

 sibly also by Alice D. Pratt, Piedmont, S. D. , June, 1895 (distributed 

 as Spiesia Lamberti spicata Hook.); and A. A. Heller, No. 3751, 

 New Mexico, distributed (but I think not published) as Spiesia 

 albiflora Heller, n. sp. 

 ^ Aragallus albiflorus condensatus. Similar to the species 



