The Principles of Descriptive Physiological Botany
The Principles of Descriptive Physiological Botany
J S John Stevens Henslow
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The seeds are attached to lateral placentae; the dissepi- ment is formed by a thin membrane, which is appa- rently a prolongation of the inner skin (endocarp) of the two carpels (fig. 123. ). (109-) Seed. It would be impossible to obtain a just notion of the seed, without first tracing the ovule through the several alterations which it undergoes, after it has been subjected to the fertilising influence of the pollen ; but, as such -letails are more especially con- SECT. I. ORGANOGRAPHY AND GLOS...SOLOGY. Ill nected with the physiology of our subject, we shall for the present confine ourselves to a few general observations on the ripe seed. Every seed is attached to the placenta, by what is termed a " funicular, or um- bilical cord;" and when the seed has fallen from the pericarp, it is marked by a scar or " hilum, " at the place where this cord was attached to it. In very many cases, this cord is small, and scarcely distinguishable, but in some it is well marked ; and in the genus Mag- nolia, when the pericarp bursts, the seeds hang out for some time, and to a con- siderable distance, by means of their umbilical cords, before they become de- tached and fall to the ground (fg.
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