(Quercus undulata Torr. var. Gunnisoni Engel. ined.). Much 

 more attractive with its glossy foliage and long feathery seeds, is 

 the mountain mahogany, Cercocarpus ledifolius Nutt. (No. 58), 

 which here attains the dimensions of a small tree often twenty 

 feet in height, with trunks six to eight inches in diameter. Along 

 the borders of all the numerous mountain streams the common 

 alder (Alnus incana var. glauca) is abundant, associated as else- 

 where in the Rocky Mountain districts with Betula occidentalis 

 Hook. As if to complete on a small scale the resemblance with 

 analogous eastern sections, the western sugar maple (Acer grandi- 

 dentatum .Nutt.) makes its appearance. Though generally of a 

 low bushy growth, it occasionally attains the size of a small tree, 

 with trunks a foot or more in diameter. The wood in hand speci- 

 mens is undistinguishable from our hard maple, and is applied to 

 similar uses. The Coniferae of this section include, on the lower 

 slopes extending down into the valley, large trees of Pinus pon- 

 derosa and Abies Douglasii, succeeded higher up by scattering 

 growths of Pinus Jlexilis and Abies concolor, and towards the sum- 

 mit by dense forests of Abies Engelmanni. The highest elevation 

 is at no point sufficient to show a well-defined timber line, though 

 bare alpine patches are spread out at various exposed points near 

 the summit of the range. The lower dividing ridge to the north 

 and west is mainly occupied hy a scattering growth of cedar, the 

 undergrowth affording the following plants, viz. : Physaria New- 

 berryi Gray (No. 14), Pachystima myrsinites Raf., Astragalus atra- 

 tus Watson (No. 47), Hymenopappus. luteus Nutt. (No. 107), 

 Gilia aggregata var. Bridgesii (No. 194), Echinospermum deflexum 

 Lehn. (No. 172). 



In the upper portion of the main valley was found a very neat 

 species of Trifolium with large reflexed heads, Trifolium Bolan- 

 deri Gray (No. 34). Near by on the borders of a springy bog 

 occurred in great abundance the interesting Leicisia Brachycalyx 

 Engel. (No. 22). This rare species, only known heretofore by a 

 few imperfect fragments, will be characterized anew by Dr. Engel- 

 mann in the accompanying list. Though much inferior in beauty 

 to the northern typical species (Leicisia rediviva Ph.), it still pre- 

 sents the same style of flower and foliage on a somewhat smaller 

 scale, and being undoubtedly hardy, may be improved by cultiva- 

 tion. Some of the more familiar aspects of the sub-alpine flora 

 were presented in the well known Rocky Mountain forms of Aqu i 



