Nelson: New Plants from Wyoming 353 



length on the same plant, differing considerably in different plants 

 ^-6 cm. long) : leaves crowded at the base, (e\v and much re- 

 duced above, linear subulate, not pungent, thick, semi-cylindric, 

 three-nerved, nearly glabrous : floral characters nearly those of 

 the species but for the nearly uniform length of peduncles and 

 pedicels. 



No doubt others have felt that the specimens occasionally dis- 

 tributed from this portion of the Rocky Mountains as A. vcnia 

 hirta Wats, were ver)' different from the Arctic plant of that name. 

 Since the difference lies largely in habit and leaf character it may 

 be considered less fundamental than if floral or fruit characters 

 were involved. However, on comparing these plants, which so 

 constantly form sub-spherical individual tufts of compactly grown 

 stems and semi-terete leaves, with the flat leaves and lax stems and 

 the inflorescence of the other it seems that they ought to be segre- 

 gated. This plant is not at all rare, specimens of it having been 

 secured in the Big Horn Mountains, in the Laramie Hills and in 

 the Medicine Bow Mountains. It must be considered alpine, 

 though occasionally it descends to sub-alpine stations. The last 

 collection was at about 12,000 feet. Excellent specimens of it 

 Avere distributed as A. veriia hirta from hLstes Park, Colo., by Mr. 

 C. E. Osterhout in 1897. 



Polemomium Haydeni 



Root large, woody, more or less branched, surmounted by a 

 short, woody, branched caudex : stems several, one or more from 

 each crown, corymbosely few branched above, a somewhat reduced 

 leaf at each node, 2-3 dm. high, the minute pubcrulence becoming 

 glandular above : leaves crowded on the crowns, more than half as 

 long as the stems; leaflets 15-25, oval, oblong or oblanceolate, 

 mostly very small, rarely exceeding i cm. in length, glabrous or 

 nearly so, flowers numerous aad rather crowded, drooping or sub- 

 erect, on slender pedicels : calyx narrowly campanulate, about as 

 long as the corolla tube : corolla blue, tubular-campanulate, 12-16 

 mm. long, the broadly elliptic lobes a little longer than the calyx : 

 filaments very slender, the base slightly dilated and sparsely pilose: 

 seeds 2-3 in each cell. 



A beautiful species, probably most nearly related to P. huviile 

 pulchelliun but much larger and more tufted ; to be at once sepa- 

 rated by its large, woody root and caudex. Three perfect speci- 

 mens of this are found in the Herbarium of the Mo. Bot. Garden, 



