. College botany; structure, physiology and economics of plants. Botany. 382 COLLEGE BOTANY small, perfect, polygamous, monoecious or dicEcious; the mar- ginal flowers when present are known as the ray flowecrs and have strap^shaped corollas, the central oi* disc flowers may be of this same type or may he tubular; the calyx is rudimentary (sun- flower) or hairy (dandelion) and adheres to the ovary; the. Fig. 224.—Sunflower head. Composite type of infloreacence. corolla is five>-piarted and gamopetalous; stamens five, attached to the corolla, anthers united into a tube around the style; styl
. College botany; structure, physiology and economics of plants. Botany. 382 COLLEGE BOTANY small, perfect, polygamous, monoecious or dicEcious; the mar- ginal flowers when present are known as the ray flowecrs and have strap^shaped corollas, the central oi* disc flowers may be of this same type or may he tubular; the calyx is rudimentary (sun- flower) or hairy (dandelion) and adheres to the ovary; the. Fig. 224.—Sunflower head. Composite type of infloreacence. corolla is five>-piarted and gamopetalous; stamens five, attached to the corolla, anthers united into a tube around the style; style two-cleft; fruit a one-seeded achene (Figs. 223, 224). This family includes many ornamental plants, such as chrys- anthemums, asters, daisies, sunflowers (Fig. 136), etc., and many weeds, such as ironweed, goldenrods, fleabane, rosin- weeds, ragweeds, burdock, thistle, dandelion, 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 Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
