Salicaceae It may, perhaps reasonably be doubted whether S. arctica, Nutt. & S. hindsiana are really distinct. 79. Salix longifolia, Muhl. (Gr. Man.) The most abundant species—usually 3-4' high in dense clumps, rarely more than 1' in diameter—very variable in pubescence, size of leaves, etc.—the undersides usually white and silky pubescent; occasionally with the anthers crowded at the extremity of the branches. 1. a) July 23, 1887 — Brigham's Creek (W.N.B.) b) July 25, 1887 — " c) Aug. 20, 1887 — " d) July 24, 1887 — Ruby Valley e) May 21, 1889 — Book Hills near H.H. Blings, near S. Lake City 80. S. longifolia, Muhl. var. angustifolia. The silky-haired form. a) July 27, 1887 — Brigham's Creek b) " c) " d) " e) " 81. S. Whelpleyana, Andr. Dec. 16, 1890 — The summits of Cascade Mountains (Elyall), exactly similar to the white form of Muhl's species at Omaha Lake. a) Aug. 6, 1889 — Uintah Mts., must climb above Pionton Lones 10,000 ft. 83/11 b) " c) " 82. S. arctica, L., glabra, Labrador; Hudson Bay to the Arctic coasts, to Behring's Straits and Alaska, and southward on the Rocky Mts. to Colorado. a) Aug. 29, 1887 — W. Humboldt Mts., Aban Baker 9,000 ft. 16 sp. b) Sept. 10, 1887 — Claron Mts., North Park 9,100 " c) " d) Aug. 10, 1889 — Uintah Mts., Peaks W. of Camp 18,000 17" 83. S. cordata, Muhl. var. angustifolia. Leaves ranging in size, 6-18" long. a) July 27, 1887 — Brigham's Creek b) May 2, 1887 — Weber Mts., Lower Willamette, N. of Monroe c) Aug. 25, 1887 — E. Humboldt Mts., Popular Crater Camp d) July 7, 1889 — Uintah Mts., Camp in upper Provo Canyon 7,000 ft. e) May 14, 1887 — Wahsatch — Bixby Creek f) Aug. 31, 1887 — " g) Sept. 26, 1887 — Lower Spring Valley, Willow Camp 2" [illegible] [illegible]