. 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. 486 COMPOSITAE. Vol. 24. Helianthus laetiflorus Pers. Showy Sun- flower. Fig. 4484. Helianthus laetiflorus Pers. Syn. 2: 476. 1807. Perennial; stem scabrous or hispid, leafy, 4°-8° high. Leaves oval-lanceolate or ovate-lanceolate, short-peti- oled, 3-nerved, rough on both sides, narrrowed at the base, acute or acuminate at the apex, serrate or serru- late
. 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. 486 COMPOSITAE. Vol. 24. Helianthus laetiflorus Pers. Showy Sun- flower. Fig. 4484. Helianthus laetiflorus Pers. Syn. 2: 476. 1807. Perennial; stem scabrous or hispid, leafy, 4°-8° high. Leaves oval-lanceolate or ovate-lanceolate, short-peti- oled, 3-nerved, rough on both sides, narrrowed at the base, acute or acuminate at the apex, serrate or serru- late, 4-10' long, \'-\¥ wide, the upper often alter- nate; heads usually several, 2'-4' broad, mostly short- peduncled; bracts of the hemispheric involucre ovate- lanceolate, or oblong-lanceolate, imbricated in only 2 or 3 series, ciliate, otherwise nearly glabrous, appressed or but little spreading, shorter than or equalling the yellow disk; rays 15-25, showy; chaff of the receptacle entire, or sometimes 3-toothed. On prairies and barrens, Pennsylvania to Minnesota. Re- corded as adventive in Massachusetts. 25. Helianthus tomentosus Michx. Woolly Sunflower. Fig. 4485. H. tomentosus Michx. Fl. Bor. Am. 2: 141. 1803. Perennial; stem stout, hirsute or hispid, especially above, branched, 4°-io° high. Leaves rather thin, ovate, or the lower oblong, mostly alternate, 3-ribbed above the base, gradually or abruptly contracted into margined petioles, rough above, softly villous-pubes- cent beneath, sparingly serrate, the lower often 1° long and 4' wide; heads commonly several or nu- merous, z'-A' broad; involucre hemispheric, its bracts imbricated in many series, linear-lanceolate, long- acuminate, squarrose, densely hirsute and ciliate, usually longer than the broad yellowish disk; chaff of the receptacle and lobes of the disk corolla pubes- cent; pappus of 2 subulate awns. In dry soil, Virginia to Georgia and Alabama. Re- ported from Illinois, probably erroneously.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
