. 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. July-Sept. 2. Helianthus petiolaris Xutt. Prairie Sun-flower. Fig. 4462. H. petiolaris Nutt. Journ. Acad. Phila. 2: 115. aridus Rydb. Bull. Torr. Club 32: 127. 1905. Anntial, similar to the preceding species, but smallerand with smaller heads; stem strigose-hispid or hir-sute. i°-3° high. Leaves all but the lowest alternate,petioled. oblong, ovate, or ovate-lanceolate
. 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. July-Sept. 2. Helianthus petiolaris Xutt. Prairie Sun-flower. Fig. 4462. H. petiolaris Nutt. Journ. Acad. Phila. 2: 115. aridus Rydb. Bull. Torr. Club 32: 127. 1905. Anntial, similar to the preceding species, but smallerand with smaller heads; stem strigose-hispid or hir-sute. i°-3° high. Leaves all but the lowest alternate,petioled. oblong, ovate, or ovate-lanceolate, rough onboth sides, usually paler beneath than above, sometimescanescent beneath, 1-3 long, entire, or denticulate, ob-tuse or acutish at the apex, mostly narrowed at thebase; heads i¥-2 broad; disk brown, mostly less than10 broad; involucre depressed-hemispheric, its bractslanceolate or oblong-lanceolate, densely canescent, some-times hispid-ciliate, acute or short-acuminate; achenesvillous-pubescent, at least when young. On dry prairies, Minnesota to Saskatchewan, Oregon,Iowa, Missouri, Texas and California. Found rarely inwaste places farther east. Races differ in leaf-form, sizeand pubescence. June-Se^ 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, L
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
