ACCESSIONS TO APOCYNUM. 181 



of ambiguity between the two groups, and I have named it in 

 reference to that characteristic. 



Apocynum Elmeri. Distinctly and in all respects of the 

 group oiA. androsaemifolium, the foliage oblong-elliptic, deep 

 green above, very glaucous beneath, the cauline leaves 3 inches 

 long, 1/i wide in the middle, tapering to a narrowed but at 

 last subtruncate base, at apex mucronate- acute : the branching 

 of the plant for the flowering quite fastigiate, the inflorescence 

 as a whole distinctly corymbose, both the terminal and lateral 

 cymes well pedunculate and many -flowered ; sepals triangular- 

 lanceolate, not equalling the tube of the corolla, the segments 

 of the corolla not as long as the tube ; the whole flower pink- 

 ish or purplish, all of them standing out horizontally on 

 slender pedicels of quite unusual length. 



This is another Washington species, collected in Whitman 

 County, in 1896, by A. D. E. Elmer. Although the collector 

 himself labelled it A . cannabinum, it lacks every mark of that 

 species. Its leaves are dark-green, they droop; the individual 

 flower is as clearly as far from that of A . cannabinum as is the 

 inflorescence. Such a plant, so clearly a western relative of 

 A. androsaemifolium, places it beyond doubt that my A. 

 pumilum is no mere subspecies. 



Apocynum griseum. Plant evidently tall, only the flower- 

 ing branches taken, these a foot long, flowering only terminally 

 and from the two uppermost axils as in ^. androsaem,ifolium, 

 below the inflorescence leafy, the leaves in 3 or 4 pairs, distinctly 

 petiolate, neither deflexed nor ascending, but spreading hori- 

 zontally, the blades broadly ovate, subcordate, the apex only 

 acutish, 1/^ to 2 inches long, 1 to iK inches wide near the 

 base, the branches, peduncles, pedicels, calyx, and the leaves 

 beneath gray with a fine short tomentum ; upper face of leaves 

 of the usual dull-green and minutely as well as sparingly 

 pubescent : flowers not numerous, of a flesh-purple hue, the 

 sepals lanceolate, shorter than the corolla-tube, this and the 

 whole of the corolla campanulate, but the lobes narrow, and 

 with unusually wide sinuses between them. 



