. 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. 5. Populus acuminata Rydberg. Black Cottonwood. Fig. 1444. P. acuminata Rydberg, Bull. Torr. Club 20: so. 1893. Populus coloradensis Dode, Mem. Soc. Hist. Nat. Autun 18: [reprint 58]. 1905. A slender tree, with terete twigs, reaching ap- proximately the dimensions of the preceding species, the crown broadly pyramidal with spreading branches, the foliage glabrou
. 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. 5. Populus acuminata Rydberg. Black Cottonwood. Fig. 1444. P. acuminata Rydberg, Bull. Torr. Club 20: so. 1893. Populus coloradensis Dode, Mem. Soc. Hist. Nat. Autun 18: [reprint 58]. 1905. A slender tree, with terete twigs, reaching ap- proximately the dimensions of the preceding species, the crown broadly pyramidal with spreading branches, the foliage glabrous. Leaves rhomboid-lanceolate, spreading or drooping, drying green, abruptly or gradually long-'acuminate at the apex, cuneate, obtuse or rounded at the base, 2'-6' long, i'-2i' wide, crenulate or the base entire; petioles slender, i'-2i' long; staminate aments about i¥ long; pistillate aments slender, drooping, 3'-5' long; capsules ovoid, obtuse, distinctly pedicelled. Borders of lakes and streams, North Dakota to As- siniboia, western Nebraska, New Mexico and Nevada. April-May. 6. Populus heterophylla L. Swamp or Downy Poplar. Fig. 1445. Populus heterophylla L. Sp. PI. 1034. 1753. An irregularly branching tree, sometimes 80° high and with a trunk 30 in diameter, the bark rough. Young foliage densely tomentose. Leaves long- petioled, broadly ovate, obtuse or subacute at the apex, rounded, truncate or subcordate at the base, crenulate-denticulate, s'-6' long, or those of young plants much larger, glabrous or somewhat floccose beneath when mature; petioles terete; bracts gla- brous or nearly so; staminate aments stout, 3'-4' long, 9"-l2" in diameter, drooping; stamens nume- rous^ pistillate aments raceme-like, peduncled, erect or spreading, loosely flowered; capsules ovoid, acute, 2-valved, 4"-6" long, shorter than or equalling their pedicels. In swamps, Connecticut to Georgia, west to Louisiana, north in the Mississippi Valley to Ohio, Indiana, Mis- souri
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
