of Plants of the Rocky Mountains. 259 



335. Asclepias vertic'dlata, L., dwarf form. 



336. Abronia ( Tripterocalyx) cycloptera. Gray. 



337. Abronia fraffvans, Nutt., figured in the second volume of the 

 Pacific Rail Road Reports. 



338. Acer glabrum, Torr., var. A. tripartitum, Nutt. 



339. Betulu alba, L. var., glutinosa, forma latifolia, Regel, or nearly. 



340. Alnus viridis, DC, 



341. Saliz fflauca, L. Masc. 



342. Salix cordata, Muhl. ? 



343. Salix reticulata, L. {S. sericea, Pursh.) Alpine. 



344. Saiix discolor, Willd. 



345. Populus tremuloides, Michx. 



346. Lloydia serotina, Reich. Anihericum, L. 



347. Calochortus venustus, Benth., ex Torr. The species greatly need 

 revision and diagnosis. 



348. Streptopus amplexifolius, DC. 



349. Leucocrinum montanmn, Nutt. in Gray, Melanth., p. 1 10. A rare 

 plant, one of the many which go to demonstrate the futility of an ordi- 

 nal separation of the Melanthiece from the Liliacece. Also collected 

 by Mr. Howard. The specimens in both cases not m good state for 



350. Allitim cernuum, Roth. 



351. Zygadenus glaucus, Nutt. 



352. Corallorkiza i^nata, R. Br. 



353. Listera cordata, R. Br. 



354. Calypso borealis, Salisb. In sprue 

 ""■ Platanthera obtusata, Lindl 



356. Platanthera hyperborea, Lindl. To this, as I suspected long ago 

 (in Ann. Lye. N. Y., when endeavoring to distinguish this species t.ora 

 the next), belongs the Habenaria dilatata of Hooker s Exot. Fl., t. 9o. 

 "Flowers greenish." -n. i rr i. 



357. Platar^thera dilatata, Lindl. Orchis dilatata, Pursh. Habenarm 

 ilalata, Gray, in Ann. Lye. N. Y. "In subalpine swamps ^ lowers 

 ■'^'te. Since ray observations upon these two species, made almost thirty 

 ears arrn T Ko.i^ft^., i;i.^ nthpr botanists, when superhci;dly exarain.ng 



: Arctic Plants. 



live, in view of th 



separati..j, -r- - ^.^^ , 





'ucture and disposition 

 be flower is so different, 

 . (like its congeners ^-^;^^^lZ^::f^i OpZys 

 -l-iertrnze, P. hyperborea readily does so " "^^ '";;;\^, ^l„,ost parallel 

 IP'fera as recently illustrated by Darwin ; tbe fonner ^ ^^^^^.^jl^j^^ 

 aiuher-cells, with a narrow stiginatic surface and a sori 

 oeak between their bases and below, within the "'^"f^^lJ^^'^na other 

 tne erect position and connivence of the base of the a '^ ^^ o-lands 



petals, are the large and elongated, linear-oblong, visc.u -^ = 

 ^P- hyperborea the labellum, spreading from ^^^^^^X^Zed l^ 

 gofge, the more exposed stigma is broad and transverse ^a. „ 



