. 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. 13. Bidens involucrata (Nutt.) Britton. Long-bracted Tickseed-Sunflower. Fig- 4517- Coreopsis involucrata Nutt. Journ. Phil. Acad. 7: Bidens Britton, Bull. Torr. Club 20: Similar to the two preceding species, minutelypubescent, i°-3° high, much branched. Segmentsof the leaves narrower, linear-lanceolate, incisedor pinnatifid, long-acuminate; hea
. 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. 13. Bidens involucrata (Nutt.) Britton. Long-bracted Tickseed-Sunflower. Fig- 4517- Coreopsis involucrata Nutt. Journ. Phil. Acad. 7: Bidens Britton, Bull. Torr. Club 20: Similar to the two preceding species, minutelypubescent, i°-3° high, much branched. Segmentsof the leaves narrower, linear-lanceolate, incisedor pinnatifid, long-acuminate; heads numerous,1-2 broad, on slender usually hispid peduncles;outer bracts of the hemispheric involucre 10-20,linear-lanceolate, acuminate, densely hispid andciliate, much exceeding the inner ones; raysorange at the base; achenes flat, ciliate and stri-gose; pappus of 2 short teeth. In swamps, Illinois to Kansas,Arkansas and Texas;southeastern Pennsylvania and Delaware. July-Sept. 72. MEGALODONTA Greene, Pittonia 4: 270. 1901. Perennial aquatic herbs, with opposite or whorled leaves, those of the submersed onesfiliformly dissected, those of the emerscd ones serrate to laciniate, and solitary peduncledshowy heads wi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
