. The American botanist and florist: including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union. Botany; Botany. THE ESSENTL\L 43 coat, which is very thin and expansible, is uncovered. In the fluid are suspended molecules of incon- ceivable minuteness, said to possess a trem- ulous motion. When the membrane is ex- posed to moistui-e, it swells and bursts, discharging its con- tents. 122. In the Orchids and Silkweed tribe, the pollen grain
. The American botanist and florist: including lessons in the structure, life, and growth of plants; together with a simple analytical flora, descriptive of the native and cultivated plants growing in the Atlantic division of the American union. Botany; Botany. THE ESSENTL\L 43 coat, which is very thin and expansible, is uncovered. In the fluid are suspended molecules of incon- ceivable minuteness, said to possess a trem- ulous motion. When the membrane is ex- posed to moistui-e, it swells and bursts, discharging its con- tents. 122. In the Orchids and Silkweed tribe, the pollen grains do not separate as into a dust or powder, but all cohere into masses called POLLixiA, accompanied by a viscid fluid. J?eview.—no. Position of the stamens. 111. Members, compared with a leaf. Pollen. The lilameut. The anther. Oonnectile. Dehiscence. In 82, point ont these parts. 114. How the anther is attached to the filament—3 modes. Of dehiscence—3 modes. Define "anther introrse"—"Anther ; What flarures illustrate? What are dimidiate anthers? 115. The cells in resrard to number. Mention some appendages. What are staminodia? 118. Define the terras definite and indefinite, as applied to the stamens. Define the terms relating to position—To inequalitj' in length. 120. Four terms relating to cohesion. Three terms expressing absence. The pollen as seen under the microscope. Structure. 112, Section of the Passion-flower (Passiflora coerulea); b. bracts of the involucre; s, sepals; p. petals; n, a, staminodia or sterile filaments; c, stipe; o, ovary; d, stamens; t, stigmas. CHAPTER VIII. or THE ESSENTIAL ORGANS. THE PISTILS. 123. The GyncBcium occupies the centre of the flower, at the termination of the axis. It consists regularly of a circle of distinct pistils (§ 60), symmetrical in number with the other circles. It is subject to great variation. The pistil may oe dis- tinct and simj^le, as in Columbine, or coherent in vai-
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1870
