. 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. 2. Arnica cordifolia Hook. Heart-leaf Arnica. Fig. 4600. Arnica cordifolia Hook. Fl. Bor. Am. i : Villous or pubescent; stem simple orsparingly branched, glandular above, i°-2high. Basal and lower leaves ovate tonearly orbicular, obtuse or acute, deeplycordate at the base, dentate. i-3 long,with slender sometimes margined petioles;stem leaves 1-3 pairs, ovate to obl
. 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. 2. Arnica cordifolia Hook. Heart-leaf Arnica. Fig. 4600. Arnica cordifolia Hook. Fl. Bor. Am. i : Villous or pubescent; stem simple orsparingly branched, glandular above, i°-2high. Basal and lower leaves ovate tonearly orbicular, obtuse or acute, deeplycordate at the base, dentate. i-3 long,with slender sometimes margined petioles;stem leaves 1-3 pairs, ovate to oblong, ses-sile or short-petioled, much smaller; heads1-8, 2-2, broad; bracts of the involucreacute or acuminate, villous, 6-io long;rays 12-16, toothed at the apex; acheneshirsute-pubescent, or glabrous at the base;pappus barbellate, white. Lake Superior to North Dakota, , New Mexico and California. Re-corded from western Nebraska. May-July. 534 COMPOSITAE. Vol. III.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
