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 . Gpnnination of Wheat—o, the grain,containing the cotyledon; c, plumule;r, radicle; .«, rootlets (adventitious). 64 STRUCTURAL BOTANY. iirst pair of leaves. But sometimes when they are very thick, asin Pea, Buckeye, and Oak, they never escaj)e the seed-coats, butremain and perish at the collum (§ 199), neither ascending nor descendins;.. Geniiivation of
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 . Gpnnination of Wheat—o, the grain,containing the cotyledon; c, plumule;r, radicle; .«, rootlets (adventitious). 64 STRUCTURAL BOTANY. iirst pair of leaves. But sometimes when they are very thick, asin Pea, Buckeye, and Oak, they never escaj)e the seed-coats, butremain and perish at the collum (§ 199), neither ascending nor descendins;.. Geniiivation of the Maple.—225, Samara; section showing the folded cotyledons at c. 226-230, Pro-gressive stages. 193. The germination of MOxocoTYLEDOiS^s, as seen in IndianCorn, Wheat, and Tulip, is in this wise. The cotyledon is notdisengaged from the seed, but remains stationary with it. Theradicle (r) protrudes slightly, and one or more rootlets (s) breakout from it and descend. The plumule (c) shoots at first par-allel with the cotyledon along the face of the seed, but soonascends, pushing out leaf from within leaf. 194. The conditions requisite for germination are moisture,air, and warmth. Moisture is necessary for softening the integ-uments, dissolving the nutritive matter, and facilitating its cir-culation. This is supplied in the rain and dew. Air, or ratherits oxygen, is required for the conversion of the starch intosugar,—a process always depending upon oxidation. The oxy-gen absorbed unites with a portion of the carbon of the starch,producing heat, evolving carbonic ac
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1870
