. 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. h Dakota, New Jersey, Georgia, Ne-braska and Louisiana. Naturalized near NewYork City, and elsewhere escaped from culti-vation. Called also ragged-cup. July-Sept. 2. Silphium integrifolium ^lichx. Entire-leaved Rosin-wood. Fig. 4422. S. integrifolium Michx. Fl. Bor. Am. 2: 146. 1803. 5. speciosnm Nutt. Trans. Am. Phil. Soc. (II) 7: Stem glabrous, rough or sometimes
. 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. h Dakota, New Jersey, Georgia, Ne-braska and Louisiana. Naturalized near NewYork City, and elsewhere escaped from culti-vation. Called also ragged-cup. July-Sept. 2. Silphium integrifolium ^lichx. Entire-leaved Rosin-wood. Fig. 4422. S. integrifolium Michx. Fl. Bor. Am. 2: 146. 1803. 5. speciosnm Nutt. Trans. Am. Phil. Soc. (II) 7: Stem glabrous, rough or sometimes hirsute, co-rymbosely branched above, 2°-5° high. Leaves ovateto ovate-lanceolate, acute or acuminate, entire, den-ticulate or remotely dentate, rough above, pubescentor glabrous beneath, those of the stem all closelysessile, often half-clasping but not connate-perfol-iate at the rounded base, 3-5 long, i-2 wide;heads usually numerous, i-2 broad; involucrenearly hemispheric, its outer bracts ovate or ovate-lanceolate, acute, spreading, ciliolate or pubescent;rays 15-25; achenes oval or obovate, 4-5 long,deeply emarginate. On prairies, Ohio to Minnesota, south to Louisiana,Nebraska, Arkansas and Texas. Genus 51. THISTLE FAMILY 3. Silphium trifoliatum L. WhorledRosin-weed. Fig. 4423. Silphium trifoliatum L. Sp. PI. 920. 1753- Stem glabrous, sometimes glaucous, corym-bosely branched at the summit, 4°-7° lanceolate or oblong-lanceolate, themiddle ones almost always whorled in 3s or4s, acuminate at the apex, narrowed at thebase and usually somewhat petioled, roughor roughish above, pubescent or nearly gla-brous beneath, entire or denticulate, s-j long,i-ii wide; heads several or numerous, i¥-2broad; involucre hemispheric, its outer bractsovate or oval, acute or obtuse, glabrous orslightly pubescent, ciliolate ; rays 15-20; achenesoval or obovate, narrowly winged, emarginate,sharply 2-toothed. In woods, Pennsylvania to Ohio, Ontario, Vir-ginia and Alabama
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
