146 FLORA OF MOUNT DESERT. mas spreading, recurved, 2-lobed; gland embracing the pedicel; leaves broadly lanceolate tapering to a prolonged slender point, glabrous and shining above, silvery-silky beneath when young. Wimmer, Salices Europææ, 133. Southwest Harbor (R. & R.). All the common large willow trees of the Island probably be- long either to S. fragilis or to this hybrid. Both were of early introduction, and have become spontaneous all over the Island. Forms of S. alba may also be looked for. 483 S. rostrata, Richardson. S. livida, Wahl., var. occidentalis, Gray. Very common in either wet or dry soil. 484 S. discolor, Muhl. COMMON SWAMP WILLOW. Very common in low grounds. 485 S. humilis × discolor, Bebb. Leaves as broad and large as those of S. humilis, but duller green, softly tomentose beneath, and with shorter petioles; the aments thick as those of S. humilis, but usually recurved, and the capsules on shorter pedicels. Bebb, Gray Man., 6th ed., 483. Swamp, Southwest Harbor (Redfield). 486 S. humilis, Marsh. Low Willow. Pussy Willow. Common in dry or wet ground everywhere from sea level to mountain summits. Forms with large leaves may be described as follows:— 487 Var. grandifolia, Anders. DC. Prod., xvi. 2. 236. Leaves obovate-oblong 3′–4′ long, 1½′ broad above the middle, shining above. Appearing in the following forms:— 488 Forma obtusifolia. Leaves very short-pointed; either smooth and glaucous, or slightly tomentose beneath. Near Great Pond (R. & R.); — Sutton Island (Rand). 489 Forma acuminata. Leaves more attenuate-pointed; glaucous and tomentose be- neath, generally becoming smooth. Seal Harbor (Redfield); — wood road to Denning Pond (Rand).