acahhmy o F scidnces.] EXPLANATION OF PLATES. 45 



PLATE 6. 



Fig. 42. Salix reticulata L., from Mount Elbert (11,500 feet); natural size. 



43 ] 



|Same specimen, two leaves; natural size. 



45. Same species, from Churchill, Hudson Bay; natural size. 



46. Same species, from Copper Island, Bering Sea; natural size. 



47. Same species, from Spitsbergen, Belsund; natural size. 



48. Same species, from Nova Zembla; natural size. 



49. Same species, from Finmark; natural size. 

 50.1 



51. 



52 : 



53. 



Leaves of same specimen from Finmark; natural size. 



Leaves of the pistillate plant from Sweden, Jamtland; natural size. 



PLATE 7. 



Fio. 54. Vaccinium caespitosum Michx., from Mount Massive (12,000 feet altitude); natural size. 



55. Leaf of same species; natural size. 



56. Leaf of Vaccinium Myrtillus L. var. viirrophylla'Kook., from Thompsons Canyon on Longs Peak (10,500 feet 



altitude); natural size. 



57. Leaf of same; natural size. 



58. Leaf of same species, but the typical, from Silverplume (10,000 feet altitude); natural size. 



59. Juncus Parryi Engelm., from headwaters of Clear Creek (12,000 feet altitude); natural size. 



60. Carex chalciolepis nob., from James Peak (13,000 feet altitude); natural Bize. 



61. Scale of pistillate flower of same; enlarged. 



62. Utriculus of same; enlarged. 



63. Carex alrata L., from Grays Peak (12,500 feet altitude); natural size. 



64. Same species; scale of pistillate flower; enlarged. 



65. Same species; Utriculus; enlarged. 



66. Carex capillaris L., from Thompson Canyon on Longs Peak (10,500 feet altitude); natural size. 



67. Poa Lettermanni Vas., from Pikes Peak (14,000 feet altitude); natural size. 

 6S. Same specimen ; aspikelet; enlarged. 



69. Same specimen; the flowering glumes; enlarged. 



70. Same specimen; palet, lodiculae and pistil; enlarged. 



71. Festuca ovina L., var. supina Hack., from Pikes Peak (14,000 feet altitude); natural size. 



72. Same specimen ; aspikelet; enlarged. 



73. Same specimen; the flowering glume ; enlarged. 



74. Same specimen; the palet; enlarged. 



