. A manual of Indian botany. Botany. 138 MORPHOLOGY. distinguished as perisperm. Seeds with both endo- sperm and perisperm are comparatively few. Usu- ally the endosperm grows at the expense of the . ji nucellus and ulti- E-3rv'' mately obliterates it. Such seeds are said to be albumin- ous, or with endo- sperm. This iscom- Fig. of Seeds mon among Mono- A with endosperm E. B with endosperm E and COtylCdOnS. In tlie perisperm P. c Exalbuminous seed. ., Testa; majority of DicO- e, embryo; c, cotyledons; w, radicle, J J tyledons, however, the embryo develops at the expense of the en
. A manual of Indian botany. Botany. 138 MORPHOLOGY. distinguished as perisperm. Seeds with both endo- sperm and perisperm are comparatively few. Usu- ally the endosperm grows at the expense of the . ji nucellus and ulti- E-3rv'' mately obliterates it. Such seeds are said to be albumin- ous, or with endo- sperm. This iscom- Fig. of Seeds mon among Mono- A with endosperm E. B with endosperm E and COtylCdOnS. In tlie perisperm P. c Exalbuminous seed. ., Testa; majority of DicO- e, embryo; c, cotyledons; w, radicle, J J tyledons, however, the embryo develops at the expense of the endosperm, so that the whole of the endosperm formed at the outset becomes ultimately obliterated, and the seed becomes exalbuminous, or without endosperm. The integuments of the ovule also share in these changes. The two coats become fused to- gether, and change more or less in texture and colour, form- ing what is known as the testa (fig. 122, s). Further, in some seeds the cells of the outer layer of the testa grow to form hairs, either all over the testa or on a particular part of it. For instance, in Cotton and Silk- cotton tree the seeds become covered all over with hairs which are known as cotton fibres; in akanda (Calotropis giganted) (fig. 123), karabi {Nerium odorum), in fact in most Asclepi- adacecB and Apocynacece, the seeds are crowned with a tassel or coma of hairs. In some seeds a new coat. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bose, G. C. London, Blackie & Son Ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
