. Nature and development of plants. Botany. 464 THE MYRTALES mouth the linear segments of the calyx alternating with the round spreading petals and the stamens. At the time of the opening of the flower the eight anthers are shedding their spores and are in line with the nectaries, while the lobed stigma is closed and bent backward (Fig. 323, C, s). A day later the stigmas assume the position shown in the lower flowers, the lobes curving backward so as to lie in the pathway leading to the nectaries (Fig. 323, C, 0). It is evident that these positions. Fig. 323. Higher forms of the Myrtales, flo
. Nature and development of plants. Botany. 464 THE MYRTALES mouth the linear segments of the calyx alternating with the round spreading petals and the stamens. At the time of the opening of the flower the eight anthers are shedding their spores and are in line with the nectaries, while the lobed stigma is closed and bent backward (Fig. 323, C, s). A day later the stigmas assume the position shown in the lower flowers, the lobes curving backward so as to lie in the pathway leading to the nectaries (Fig. 323, C, 0). It is evident that these positions. Fig. 323. Higher forms of the Myrtales, flowers epigynous: A, fiower of Oenothera—0, ovary. B, enlarged sectional view of flower, showing the receptacle enveloping the ovules. The receptacle grows above the ovary, forming a tube, t, that bears at its summit the lobes of the calyx, c, the petals, p, and stamens. C, inflorescence of the great willow herb {Chamaenerion) —s, closed stigma in young flowers; 0, opened stigmas in older flowers; a stigma touching anthers in withered flowers. D, capsule opening and dis- charging the seeds. E, a seed enlarged.—C after Kerner. must necessitate a crossing if the flowers receive the proper vis- itors. If, for any reason, crossing should fail autogamy results, owing to the continued curvature of the stigmas, which are finally brought into contact with the anthers, in which work the positions of the flowers and stamens cooperate, as shown in the lowest. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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