of Plants of the Rocky Mountains. 



Sir Wm. Hooker in Exot. Fl., t. 95, under tbe name of Hahenaria dih- 

 tata), the glands are smaller and orbicular, the beak wanting, the anther- 

 cells more divergent, and, from the curvature of the flower, more over- 

 hanging, and the stalks of the pollinia very attenuated and weak Thus 

 disposed, the pollinia very commonly fall out of the anther-cells while the 

 tip of the labellum is still engaged under the point of the upper sepal 

 and petals, or even in the closed buds; and when the labellum is dis- 

 engaged and becomes recurved, or even before, the pollinia are apt to 

 toj)ple over and fall upon the broad stigma beneath.* That our P.dik- 

 /a/a is the Orchis dilaiafa of Tursh I am assured. Our green flowered 

 species should be re-compared with the Iceland F. hyperborea, and with 

 this the Iceland Orchis Koenigii (described originally by Retz as with 

 ''labio tripartito," but referred by Linnaeus to 0. hyperborea, and annexed 

 by Lindley to a probably quite different species from Unalaschka) should 

 be collated. 



358. Juncus castaneus, Sm. ; an alpine form. 



359. Juncug triglumis, L. With the last. 



360. Juncua arcticus, var. gracilis, Hook. ? Alpine ; too young. 



361. Juncus Menziesii, R. Br. ex Hook. 



362. Luzula parviflora, DC. 



392. Luzula spicata, DC, var., approaching L. Peruviana. Alpine. 



363. Poa alpina, L. ? " At the foot of the snow banks ; Jnly." 



364. Munroa squarrosa, Torr. Crypsis, Nutt. Deep sand beds, east 



365. Calamagrostis sylvatica, Trin. "Dry bottoms of Clear Creekj; 



368. A purple variety of the above (nearly C. purpurascens, K. Br.), 

 m an older state. "Alpine; August." 



366. Muhlenbergia gracilis, Trin. Calycodon montannm, Nutt. PL 

 Garab., ex Thurber. 



367. Aira cmpitosa, var. arctica, Trin. JDeschampsia hrevifolia, R. Br. 



369. Buchloe dactyloides.EDselm.: both sexes of the Buffalo-Grass. 

 "Plains of the Platte." 



370. Boutelona oligostachya, Torr. 

 til' -^/.^^^^^ cuspidata, Nutt. Stipa membranacea, Pursh. 



'' t caspitosa, L. " Alpine ridges." 



rr, jyQmjg. " alpine ridges." 



Poanernoralis, L., or one of the species referable to this. "Al- 



h self fertilizes, and that without trie a 

 this the anthercells dehisce ^h'^" V^J 

 ; packets of pollen (in this ^P«'^J/f^ 



duced betore the flower had opened. Yet the arrangements for the removal of iW 

 polhnia by insects are as perlTct as in the speciesThTch denend upon insect""* 

 and wh. e a portion of the^oUen-packets falfaway It an eaX period, the re^r^ 

 «riti^^dy "" *^^ "'"^ '^^"'"•- The plaut requires, and will well reward, 



