. 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. lower leaves entire or leaves deeply 3-lobed or 3-divided. Plant more or less hirsute ; leaves thin : chaff scabrous ; leaves thick ; chaff blunt, pubescent at neither 3-lobcd nor 3-divided. Plants hispid ; style-branches subulate. Stem leaves lanceolate to oblong; involucre shorter than the rays. ^ _. Stem leaves oval to obovate; involucra
. 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. lower leaves entire or leaves deeply 3-lobed or 3-divided. Plant more or less hirsute ; leaves thin : chaff scabrous ; leaves thick ; chaff blunt, pubescent at neither 3-lobcd nor 3-divided. Plants hispid ; style-branches subulate. Stem leaves lanceolate to oblong; involucre shorter than the rays. ^ _. Stem leaves oval to obovate; involucral bracts foliaceous, nearly as long as the rays 4- ^- pubescent or glabrate; style-branches merely ciliate. Leaves denticulate or entire; rays g-\2 long. Basal leaves narrowed at base. 5. R. fnlgida. Basal leaves cordate at base. 6. R. umhrosa. Leaves dentate or laciniate; rays about 18 long. 7. R. speciosa. Chaff canescent. 8. R. grandiflora Disk elongated or cylindric in fruit, yellowish or gray. Leaves very thick, shallowly toothed. g. R. maxima. Leaves thin, pinnately divided or pinnatifid. 10. 1. R. triloba. 2. R. subtomentosa. 3. R. hirta. 470 COAIPOSITAE. \0L. I. Rudbeckia triloba L. Thin-leavedCone-flower. Fig. 4442. Rudbeckia triloba L. Sp. PI. 907. 1753. Stem somewhat pubescent and rough, rarelyglabrate, branched, 2°-5° high. Leaves thin,rough on both sides, bright green, the basaland lower ones petioled, some or all of them3-lobed or 3-parted, the lobes lanceolate or ob-long, acuminate, sharply serrate; upper leavesovate, ovate-lanceolate, or lanceolate, acumi-nate or acute, narrowed to a sessile base orinto short margined petioles, serrate or entire,2-4 long, i-l wide; heads nearly 2 broad,corjmbed; brads of the involucre linear,acute; pubescent, soon reflexed; rays 8-12,yellow, or the base orange or brownish-purple;disk dark purple, ovoid, about 6 broad; chaffof the receptacle awn-pointed; pappus a mi-nute crown. I
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
