Text-book of structural and physiological botany / by Otto W. Thomé ... and Alfred W. Bennett.

  • Thomé, Otto W. (Otto Wilhelm), 1840-1925.
Date:
1885
Catalogue details

Licence: Public Domain Mark

Credit: Text-book of structural and physiological botany / by Otto W. Thomé ... and Alfred W. Bennett. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    and petals five each, rarely four or three ; stamens as many or twice as- many as petals ; ovary 2-locular, rarely unilocular or more ; endo- sperm fleshy, rarely absent. Herbs, shrubs, or trees, with exstipulate: leaves. Principal order Polygalacece {Polygala, Kraviencu Seciirtdaca). Cohort V. Parietales. Stamens definite or indefinite ; carpels- connate into a unilocular ovary with parietal placentation, rarely spuri- ously bilocular or more by the prolongation of the placentae (carpels occasionally fi-ee ; ovaiy occasionally 3-locular or more).] Order \, Papaverace^. (Fig. 526.) Herbs with a yellow or white- latex. The sepals are two, distinct, deciduous ; the petals four, arranged; II. Fig. 526.—I. Floral diagram of Prt/flwr; II. capsule (siliqua) of Chelidoiiium (natural size). in two whorls, regular [and deciduous] ; the stamens indefinite, free and' hypogynous; the ovary unilocular or spuriously multilocular ; the seeds with a small straight embryo at the base of a copious endosperm ; the fruit a capsule, either bursting into two valves, and resembling a siliqua (Fig. 526, II.), or opening by pores, four to twenty in number, situated beneath the peltate stigma (see Figs. 233, 294, 313, pp. 126, 144^ 150). [Principal genera: — Platysleinon, Chelidoniuni, Saitguinaria, Papaver, Plschscholhia, Argetuone, Glaiiciuvi, Meconopsis, Ro:meria?[ Among officinal products of the order are the foliage of the larger celandine Chelidonium iiiajns, the petals of the common poppy Papaver Jihceas, and the dried latex of the unripe capsules of the opium-poppy Papaver soviniferum. The latter is an important article of commerce from Egypt, Turkey, [India, and China], yielding opium and laudanum.