. 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. Vol. III. 2. Petasites trigonophylla Greene. Arctic Sweet Coltsfoot. Fig. 4596. Petasites trigonophylla Greene, Leaflets 1: 180. 1906. Scape very scaly, 3'-io' high. Leaves deltoid-reniform to ovate-orbicular in out- line, 2'-6' long, irregularly lobed, green and glabrous above, persistently white-tomen- tose beneath, the lobes few-toothed; heads corymbose, the
. 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. Vol. III. 2. Petasites trigonophylla Greene. Arctic Sweet Coltsfoot. Fig. 4596. Petasites trigonophylla Greene, Leaflets 1: 180. 1906. Scape very scaly, 3'-io' high. Leaves deltoid-reniform to ovate-orbicular in out- line, 2'-6' long, irregularly lobed, green and glabrous above, persistently white-tomen- tose beneath, the lobes few-toothed; heads corymbose, the inflorescence about 4' long; involucre campanulate; flowers nearly white, the marginal ones of the pistillate heads radiate. Wet grounds, Quebec, Minnesota and Sas- katchewan. June-Aug. Petasites frigida (L.) Fries, admitted, in our first edition, as recorded from Lake Win- nipeg, is a high boreal species, not known to occur within our area. 3. Petasites sagittata (Pursh) A. Gray. Arrow-leaf Sweet Coltsfoot. Bitter- bur. Fig. 4597. Tussilago sagittata Pursh, Fl. Am. Sept. 332. 1814. Nardosmia sagittata Hook. Fl. Bor. Am. 1: 307. 1833. Petasites sagittata A. Gray, in Brew. & Wats. Bot. Cal. 1: 407. 1876. Scape and racemose-corymbose inflorescence similar to those of the two preceding species. Leaves deltoid-ovate to reniform-ovate, persist- ently white-tomentose beneath, glabrous or nearly so above, 4'-io' long, their margins sinuate-den- ticulate, neither cleft nor lobed; involucre cam- panulate ; flowers nearly white, the marginal ones of the pistillate heads radiate. In wet grounds, Labrador to Hudson Bay, Manitoba and Minnesota, west to British Columbia, south in the Rocky Mountains to Colorado. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 1859-1934; Brown, Addi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
