. Essentials of botany. Botany; Botany. 240 KEY AND FLORA pollination. The genera of the northern United States are divided into two suborders: I. TuBULiFLORiE, corolla of the bisexual flowers tubular and 6-lobed; II. Liguliflok^, corollas all strap-shaped and flowers all Fig. 30. Akenes with various types of pappus A, Rudbeckia, pappus wanting; B, Cichoriuin, pappus a crown of fine scales; C, Coreopsis, pappus of 2 small scales; D, Helenium, pappus a crown of conspicuous scales; B, Oirsium, pappus a tuft of plumose hairs; F, Lac- tuca, pappus borne on a long beak I. TUBULIFLORiE 1
. Essentials of botany. Botany; Botany. 240 KEY AND FLORA pollination. The genera of the northern United States are divided into two suborders: I. TuBULiFLORiE, corolla of the bisexual flowers tubular and 6-lobed; II. Liguliflok^, corollas all strap-shaped and flowers all Fig. 30. Akenes with various types of pappus A, Rudbeckia, pappus wanting; B, Cichoriuin, pappus a crown of fine scales; C, Coreopsis, pappus of 2 small scales; D, Helenium, pappus a crown of conspicuous scales; B, Oirsium, pappus a tuft of plumose hairs; F, Lac- tuca, pappus borne on a long beak I. TUBULIFLORiE 1 Corollas some or all of them tubular. Rays white, pink, or purplish. Rays many ; akenes iiat; pappus wanting; low herbs. Bellis, I , Rays many; akenes cylindrical or winged, grooved; pappus wanting; tall herbs or shrubby. Chrysanthemum, X Rays many; akenes flat; pappus of an outer row of minute scales and an inner row of delicate bristles. Erigeron, II Rays many; akenes cylindrical or ribbed; pappus wanting; strong-scented, branching herbs. Anthemis, IX Rays few. Achillea, VIII 1 The characters in this key are not necessarily true of all species in the genera referred to, but only of tho^e described 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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