. 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. bs with alternate spinulose-dentate or lobed leaves andmany-flowered heads of tubular or of both tubular and radiate yellow flowers (heads rarelywithout rays). Involucre hemispheric to campanulate, its bracts imbricated in several series,the outer ones gradually smaller. Receptacle flat or convex, generally foveolate, fertile. Disk-flowers usually perfect. A
. 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. bs with alternate spinulose-dentate or lobed leaves andmany-flowered heads of tubular or of both tubular and radiate yellow flowers (heads rarelywithout rays). Involucre hemispheric to campanulate, its bracts imbricated in several series,the outer ones gradually smaller. Receptacle flat or convex, generally foveolate, fertile. Disk-flowers usually perfect. Anthers obtuse and entire at the, flattened, their appendages short, lanceolate. Achenes oblong or obovoid,obtuse, white-tomentose, or canescent, usually 8-io-nerved. Pappus of 1-3 series of numer-ous capillary persistent more or less unequal bristles. [Greek, iron-flower.] About 15 species, natives of America. Besides the following, about lo others occur in thewestern parts of the United States. Type species: Sideranthus spinulosus (Nutt.) Sweet. Rays none ; leaves dentate. i. S. present. Leaves dentate ; annual. 2. S. anniius. Leaves pinnatifid ; perennial. 3. i. I. Sideranthus grindelioides (Xutt.) Sideranthus. Fig. 4208. Eriocarpum grindelioides Nutt. Trans. Am. Phil. Soc.(II.) 7: 321. 1841. Aplopappiis Nuttallii T. & G. Fl. N. A. 2: 240. 1842. Sideranthus grindelioides Britton, Manual 932. 1901. Perennial by a deep woody root, finely pubescent;stems tufted, simple, erect, 4-12 high. Leaves ob-long-lanceolate to spatulate, sessile, or the lower peti-oled. ¥-1 long, firm, acute or obtusish, spinulose-dentate ; heads several or solitary, terminating thestem or branches; peduncles i long, or less; invo-lucre campanulate, its bracts linear, acute, puberulent,their tips somewhat spreading, the outer shorter thanthe inner; achenes densely silky tomentose. In dry soil. South Dakota to Assiniboia, Nebraska,New Mexi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
