. Introduction to botany. Botany. 240 KEY AND FLORA pollination. The genera of the northern United States are divided into two suborders: I. Tubulifloe^, corolla of the bisexual flowers tubular and 5-lobed; II. LiGULiFLOEiE, corollas all strap-shaped and flowers all Pig. 30. Akenes with various types of pappus A, RudbecTcia, pappus wanting; B, Cichorium, pappus a crown of fine scales; C, Coreopsis, pappus of 2 small scales; S, Heleniuin, pappus a crown of conspicuous scales; E, Girsium, pappus a tuft of plumose hairs; F, Lac- tuca, pappus borne on a long beak I. TUBULIFLORiE 1 Corol
. Introduction to botany. Botany. 240 KEY AND FLORA pollination. The genera of the northern United States are divided into two suborders: I. Tubulifloe^, corolla of the bisexual flowers tubular and 5-lobed; II. LiGULiFLOEiE, corollas all strap-shaped and flowers all Pig. 30. Akenes with various types of pappus A, RudbecTcia, pappus wanting; B, Cichorium, pappus a crown of fine scales; C, Coreopsis, pappus of 2 small scales; S, Heleniuin, pappus a crown of conspicuous scales; E, Girsium, 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 flat; 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 those 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; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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