. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 41 B from the arctic American, the several specimens which I have collected in the Spruce-zone of the Rocky mountains in Colorado agree in all respects with the Siberian FiGTJBE L. 1. Saxifraga aestivalis Fisch. and Mey., showing the rhizome, the basal leaves, and the base of the flower-bearing stem (St.); one third of the natural size; specimen from south coast of Coro- nation gulf, Cape Barrow. 2. Same species var. Nelsoniana (Don); a basal leaf; one third of the natural
. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Arctic Plants: Morphology and Synonymy 41 B from the arctic American, the several specimens which I have collected in the Spruce-zone of the Rocky mountains in Colorado agree in all respects with the Siberian FiGTJBE L. 1. Saxifraga aestivalis Fisch. and Mey., showing the rhizome, the basal leaves, and the base of the flower-bearing stem (St.); one third of the natural size; specimen from south coast of Coro- nation gulf, Cape Barrow. 2. Same species var. Nelsoniana (Don); a basal leaf; one third of the natural size; specimen from Herschel island. 3. S. aestivalia; a basal leaf; one third of the natural size; specimen from Siberia; Jenisei, Tolstoi Nos. S. Nelsoniana Don. This is by Engler referred to the preceding species as a variety; the leaf- blade (Fig. 2) resembles that of the Siberian plant but the petioles are much longer and the flowers relatively larger; the rhizome shows the same structure as described above. S. Lyallii Engl, and S. davurica Pall. These are both known from Alaska and adjacent islands; they exhibit the same habit as the preceding species but the leaf-shape is quite distinct. S. hieraciifolia W. et K. and S. nivalis L. These are also members of this section (Boraphila) but their habit is very different from that of S. aestivalis. The rhizome is relatively short but quite stout in the former, and secondary roots develop freely; the almost sessile leaves are arranged in a rosette surrounding the terminal, flower-bearing stem. Axillary buds sometimes develop rosettes contemporarily with the terminal, and several inflorescences may appear upon the same individual. Characteristic of these species of Boraphila is the ea rly withering of the primary root. Although quite frequent in the arctic region, S. stellaris L. var. comosa Poir. was not found by the expedition. I mention it in connection with the other species since it is quite an interesting plant showing som
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