. A manual of botany. Botany. 238 MANUAL OP BOTANY where it is occasionally used as an ingredient in pickles. Its ashes also yield barilla. Some authors regard this genus as belonging to Chenopodiacese. Order 8. Polygonace^, the Buckwheat Order.—Cha- r a c t e r.—Herbs or rarely shrubs. Leaves alternate, simple, com- monly with ochreate stipules above the swollen joints (nodes) of the stem, or rarely exstipulate. Flowers perfect, or sometimes unisexual. Calyx inferior of from 3—6 sepals, more or less per- sistent, imbricate. Stamens few, hypogynous or rarely peri- gynous ; amthers dehiscing lo
. A manual of botany. Botany. 238 MANUAL OP BOTANY where it is occasionally used as an ingredient in pickles. Its ashes also yield barilla. Some authors regard this genus as belonging to Chenopodiacese. Order 8. Polygonace^, the Buckwheat Order.—Cha- r a c t e r.—Herbs or rarely shrubs. Leaves alternate, simple, com- monly with ochreate stipules above the swollen joints (nodes) of the stem, or rarely exstipulate. Flowers perfect, or sometimes unisexual. Calyx inferior of from 3—6 sepals, more or less per- sistent, imbricate. Stamens few, hypogynous or rarely peri- gynous ; amthers dehiscing longitudinally. Ovary superior, l-ceUed ; styles and stigmas 2—8; ovule solitary, orthotropous. Fruit usually a triangular nut, and commonly enveloped in the persistent calyx. Seed solitary, erect; generally with farina- ceous albumen. Diagnosis.—Usually herbs with ochreate stipules. Leaves simple, alternate. Calyx inferior, persistent, imbricate. Stamens definite. Ovary 1-ceUed; styles and stigmas 2—8. Fruit Fig. 997. Fig. Fig. 997. Flower of a species of Polygo- num. Fig. 998. Pistil of a species of Rumex. triangular. Seed solitary, erect, usually with mealy albumen, radicle superior. Distribution and Numbers.—Generally diffused over the globe, and more particularly so in temperate regions. Illus- trative Genera :—Kheum, Linn.; Polygonium, Linn.; Cocco- loba, Jacq.; Eumex, Linn. There are about 500 species. Properties and Uses.—Chiefly remarkable for the presence of acid, astringent, or purgative properties. The acidulous character is principally due to the presence of salts of oxalic acid. The fruits and roots of several species are more or less nutritious. Series 2.—Multiovulatce aquaticce. Order 9. Podostemacb^, the Podostemon Order.— Character.—Aquatic herbs with the aspect of Mosses or Liverworts. Leaves minute and densely imbricate, or finely. Please note that these images are extracted from scanned page images that may have been digitally en
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