. Botany, with agricultural applications. Botany. 24 FLOWERS banner; the two side pieces, known as wings; and the single boat-shaped portion beneath the wings, known as the keel. In the Red Clover flower shown in Figure 21, these parts are pointed out. The stamens and pistil are entirely enclosed by the keel, and when pressure is exerted on the keel, the stamens and pistil spring out of their enclosure with considerable force. {Fig. 22.). B ^ Fig. 23. — Flowers of the Yarrow {Achillea millefolium), a Composite. A, a head of flowers sectioned, showing the strap-shaped flowers around the margin
. Botany, with agricultural applications. Botany. 24 FLOWERS banner; the two side pieces, known as wings; and the single boat-shaped portion beneath the wings, known as the keel. In the Red Clover flower shown in Figure 21, these parts are pointed out. The stamens and pistil are entirely enclosed by the keel, and when pressure is exerted on the keel, the stamens and pistil spring out of their enclosure with considerable force. {Fig. 22.). B ^ Fig. 23. — Flowers of the Yarrow {Achillea millefolium), a Composite. A, a head of flowers sectioned, showing the strap-shaped flowers around the margin and the tubular flowers occupying the central region of the head. B and C are tubular and strap- shaped flowers more enlarged A B Fig. 24. — A, flower from the head of Dandelion, a, strap-shaped coroUa; b, calyx made up of many slender hairs known as pappus; p, base of pistil; s, stamens forming a tube around the upper part of the pistil. B, tubular flower and fruit of Beggar's Tick showing tubular corolla (a) and the calyx (6) consisting of two spiny teeth which persist and aid in scattering the fruit. This process of releasing the stamens and pistil, known as " tripping the flower," is mainly the work of insects and is im- portant, because in some of the Legumes the flowers will produce no seed unless tripped. Composite Flowers. — There is a large group of plants to which Lettuce, Dandelions, Sunflowers, Beggar's Tick, Thistles,. 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
