. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 6l2 BETULACEAE. Vol. 12. Betula nana L. Dwarf or Alpine Birch. Fig- I505- Betula nana L. Sp. PI. 983. 1753. B. Michauxii Spach, Ann. Sci. Nat. (II.) 15: 195. 1841. A low diffuse shrub, similar to the preceding species, but the twigs glandless, puberulent or glabrous. Leaves orbicular, obovate, or reniform and wider than long, bright green, firm, glabrous, o
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 6l2 BETULACEAE. Vol. 12. Betula nana L. Dwarf or Alpine Birch. Fig- I505- Betula nana L. Sp. PI. 983. 1753. B. Michauxii Spach, Ann. Sci. Nat. (II.) 15: 195. 1841. A low diffuse shrub, similar to the preceding species, but the twigs glandless, puberulent or glabrous. Leaves orbicular, obovate, or reniform and wider than long, bright green, firm, glabrous, on both sides when mature, deeply and incisely crenulate, rounded at the apex, rounded, obtuse or cuneate at the base, 3"-io" long; petioles rarely more than 1" long; staminate aments i'-i' long, solitary or clustered; pistillate aments oblong, sessile or short-peduncled, erect or somewhat spreading, 3"-S" long; fruiting bracts glabrous, the lower usu- ally 3-lobed, the upper ovate or lanceolate, mostly entire; nut oblong, wingless or narrowly winged. Greenland and Labrador to Hudson Bay. Also 'in northern Europe and Asia. May-June. .5. ALNUS (Tourn.) Hill, Brit. Herb. 510. 1756. Shrubs or trees, with dentate or serrulate leaves, few-scaled or naked buds, and flowers of both kinds in aments, expanding before, with or after the leaves, making in most species their first appearance during the preceding season, the staminate pendulous, the pistillate erect, clustered. Staminate flowers 3 or sometimes 6 in the axil of each bract, consisting of a mostly 4-parted perianth, 4 stamens and subtended by I or 2 bractlets; filaments short, simple; anther-sacs adnate. Pistillate flowers 2-3 in the axil of each bract, without a perianth, but subtended by 2-4 minute bractlets; ovary sessile, 2-celled; styles 2; bracts woody, persistent, S-toothed or erose. Nut small, compressed, wingless or winged. [Ancient Latin name de- rived from the Celtic, in allusion to the growt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
