. 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. 13. Bidens involucrata (Nutt.) Britton. Long-bracted Tickseed-Sunflower. Fig. 4517- Coreopsis involucrata Nutt. Journ. Phil. Acad. 7: 74. 1834- Bidens involucra'a Britton, Bull. Torr. Club 20: 281. 1893. Similar to the two preceding species, minutely pubescent, l°-3° high, much branched. Segments of the leaves narrower, linear-lanceolate, incised or pinnatifid,
. 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. 13. Bidens involucrata (Nutt.) Britton. Long-bracted Tickseed-Sunflower. Fig. 4517- Coreopsis involucrata Nutt. Journ. Phil. Acad. 7: 74. 1834- Bidens involucra'a Britton, Bull. Torr. Club 20: 281. 1893. Similar to the two preceding species, minutely pubescent, l°-3° high, much branched. Segments of the leaves narrower, linear-lanceolate, incised or 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 and ciliate, much exceeding the inner ones; rays orange 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 ones filiformly dissected, those of the emersed ones serrate to laciniate, and solitary peduncled showy heads with both tubular and radiate flowers. Involucre hemispheric, its bracts in 2 series, rather broad, distinct or nearly so, the outer ones smaller than the inner, often lax. Receptacle chaffy. Rays neutral, yellow. Disk-flowers perfect, fertile, their corollas tubular, S-toothed. Anthers minutely sagittate at the base. Style-branches with subulate tips. Achenes nearly terete, truncate at both ends. Pappus of 3-6 long-subulate awns which are retrorsely barbed, except near the base. [Greek, large-toothed, referring to the pappus awns.] Two known species, the following typical, the other occurring in Washington Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - col
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