. 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 102nd meridian. Gkxus 66. THISTLE FAMILY. 3. Helianthus angustifolius L. Xarrow-leavedor Swamp Sunflower. Fig. 4463. Helianthus angustifolius L. Sp. PL 906. 1753. Perennial by slender rootstocks; stems branched above,or simple, slender, rough or roughish above, often hir-sutet below, 2°-]° high. Leaves firm, entire, sessile,linear, slightly scabrous, rarely somewhat canescent be-neath, 2-^ l
. 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 102nd meridian. Gkxus 66. THISTLE FAMILY. 3. Helianthus angustifolius L. Xarrow-leavedor Swamp Sunflower. Fig. 4463. Helianthus angustifolius L. Sp. PL 906. 1753. Perennial by slender rootstocks; stems branched above,or simple, slender, rough or roughish above, often hir-sutet below, 2°-]° high. Leaves firm, entire, sessile,linear, slightly scabrous, rarely somewhat canescent be-neath, 2-^ long, 2-z wide, the margins revolute whendry, the upper ones all alternate, the lower opposite;heads usually few, sometimes solitary, 2-2, broad; in-volucre hemispheric, its bracts linear-lanceolate, acuteor acuminate, scarcely squarrose, pubescent; receptacleslightly convex; disk purple; chaff entire or 3-toothed;rays 12-20; achenes truncate, glabrous; pappus usuallyof 2 short awns. In swamps, Long Island, N. Y., to Florida, Kentucky andTexas, mainly near the coast.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
