. The botany of crop plants; a text and reference book. Botany, Economic. 288 BOTANY OF CROP PLANTS ous ocreas. The flowers are on short, jointed pedicels and occur in fascicles, each of which is a raceme; the entire inflorescence is paniculate. The flowers (Fig. in) are small, greenish white and perfect; the calyx is six-parted, persistent, and becomes enlarged somewhat in the fruit (Fig. 113); there are nine stamens; the ovary is three-angled and bears three short, recurved styles, with large stigmas. -^-V^-perj/jfen/ j/y/ej. persiMenl cai\jx lobe Fig. :i3.—Fruit of rhubarb (Rheum rhaponticu
. The botany of crop plants; a text and reference book. Botany, Economic. 288 BOTANY OF CROP PLANTS ous ocreas. The flowers are on short, jointed pedicels and occur in fascicles, each of which is a raceme; the entire inflorescence is paniculate. The flowers (Fig. in) are small, greenish white and perfect; the calyx is six-parted, persistent, and becomes enlarged somewhat in the fruit (Fig. 113); there are nine stamens; the ovary is three-angled and bears three short, recurved styles, with large stigmas. -^-V^-perj/jfen/ j/y/ej. persiMenl cai\jx lobe Fig. :i3.—Fruit of rhubarb (Rheum rhaponticum). cross-section. X 5. .1, external view; B, Self-pollination is prevented to a large degree by the matu- ration of anthers before the stigmas. Stigmas of flowers below on the inflorescence receive pollen from the anthers of younger flowers borne above them. Pollen is disseminated by wind, insects, and gravity. Rhubarb fruit (Fig. 113) is an achene surrounded at the base with the persistent remains of the perianth; it has three broad, thin wings which are traversed by a longitudinal nerve running near ihu margin; it is tip[)ed l)y a small per-. 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 Robbins, Wilfred William, 1884-1952. Philadelphia, P. Blakiston
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
