. Botany for agricultural students . Botany. Fig. 7. — Section through a flower of the Peach. There is but Flowers having the four sets of organs, as shown in Figure 2, are called complete flowers to distinguish them from incomplete flowers, that is, flowers in which some of the organs are lacking. The organs are gener- ally arranged in a circular fashion around the receptacle, and are characterized as be- ing in cycles or whorls. In some flowers a part or all of the perianth is lacking. In the Buckwheat, as shown in Figure 3, only one whorl surrounds the stamens and pistil, and it is evident
. Botany for agricultural students . Botany. Fig. 7. — Section through a flower of the Peach. There is but Flowers having the four sets of organs, as shown in Figure 2, are called complete flowers to distinguish them from incomplete flowers, that is, flowers in which some of the organs are lacking. The organs are gener- ally arranged in a circular fashion around the receptacle, and are characterized as be- ing in cycles or whorls. In some flowers a part or all of the perianth is lacking. In the Buckwheat, as shown in Figure 3, only one whorl surrounds the stamens and pistil, and it is evident that this flower does not have both calyx and corolla. In such cases, the petals are considered missing and the flower is said to be apetalous (" without petals")- Often instead of being composed of entirely separate petals (polypetalous), the corolla is a tube or funnel-shaped struc- one pistil (p), but many ture, which appears to be composed of united stamens (s). Much en- petals (gamopetalous), separate only at the l^'^'ged. top. {Fig. 4-) The flowers of the Tobacco Plant, Pumpkins, Squashes, and Water- melons are examples of gamopetalous flowers. In some cases, as in the Tobacco, Clover, and some other plants, the sepals seem to have joined into one structure (gamosepalous), forming a tube- or cup-like calyx. {Fig. 4 and 5.) Flowers also differ in the essential organs contained. Fig. 8. —Section through an Apple flower Unisexual Flowers.— showing the compound pistil composed of five Flowers having both sta- carpels. The five carpels (a) are free above mens and pistils are but joined below, c, corolla; s, stamens; i, known as perfect or bisex- calyx. Much enlarged. t n -r ual flowers. In some plants, the stamens and pistils occur in different flowers, in which case the flower having stamens only is called a staminate flower,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
