. 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. 6. Silphium terebinthinaceum Jacq. Prairie Dock. Prairie Burdock. Fig. 4426. Silphium terebinthinaceum Jacq. Hort. Vind. 1: pi. 43. 1770. .S. pinnatifidum Ell. Bot. S. C. & Ga. 2: 462. 1824. Silphium terebinthinaceum pinnatifidum A. Gray, Man. 220. 1848. Stem glabrous or nearly so, branched and scaly above, 4°-io° high. Leaves all basal or nearly so, coriac
. 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. 6. Silphium terebinthinaceum Jacq. Prairie Dock. Prairie Burdock. Fig. 4426. Silphium terebinthinaceum Jacq. Hort. Vind. 1: pi. 43. 1770. .S. pinnatifidum Ell. Bot. S. C. & Ga. 2: 462. 1824. Silphium terebinthinaceum pinnatifidum A. Gray, Man. 220. 1848. Stem glabrous or nearly so, branched and scaly above, 4°-io° high. Leaves all basal or nearly so, coriaceous, ovate, mostly long-petioled, acute at the apex, cordate at the base, rough on both sides, often 12' long and 6' wide, sharply dentate, laciniate or pinnatifid; heads numerous, 1V-3' broad, borne on glabrous peduncles; involucre hemispheric, its bracts ovate-oblong, erect, glabrous or minutely pubescent; rays 12-20; achenes obovate, narrowly winged, slightly 2-toothed and emarginate at the apex. On prairies and in dry woods, southern On- tario and Ohio to Minnesota, south to Georgia, Iowa and Louisiana. Rosin-plant. July-Sept. 7. Silphium reniforme Raf. Kidney- leaved Silphium. Fig. 4427. Silphium reniforme Raf.; Nutt. Trans. Am. Phil. Soc. (II) 7: 342. 1840. S. compositum reniforme T. & G. Fl. N. A. 2: 276. 1842. Stem scape-like, 3°-6° tall, glabrous or nearly so, corymbosely branched above. Leaves mostly basal, broadly ovate to reni- form, 4'-i5' long, obtuse or abruptly point- ed, coarsely dentate, deeply cordate at the base, long-petioled; heads numerous, about 1' broad, the peduncles glabrous; involucre campanulate, the bracts ovate or broadly oblong to narrowly oblong or oblong-spatu- late, obtuse; rays several, yellow; achenes suborbicular or orbicular-obovate, 3I" long, the wings prolonged enough to form a shal- low apical sinus. In dry or stony soil, mountains of Virginia and North Carolina. July-Aug. Silphium compositum Michx., a related southern spe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
