. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. fixed, and its subsequent growth tends to raise the cotyle- dons above the ground, as in the bean. 339. When cotyledons rise into the air, germination is said to be epigeal ("above the earth"). Bean and pumpkin are examples. When the hypo- cotyl does not elongate greatly and the coty- 313. Sprouting of ledons remain under castorbean- ground, the germination is hypogeal ("be- neath the earth"). Pea and scarlet run- ner bean are examples. When the ger- minating seed lies on
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. fixed, and its subsequent growth tends to raise the cotyle- dons above the ground, as in the bean. 339. When cotyledons rise into the air, germination is said to be epigeal ("above the earth"). Bean and pumpkin are examples. When the hypo- cotyl does not elongate greatly and the coty- 313. Sprouting of ledons remain under castorbean- ground, the germination is hypogeal ("be- neath the earth"). Pea and scarlet run- ner bean are examples. When the ger- minating seed lies on a hard surface, as on closely compacted soil, the hypocotyl and rootlets may not be able to secure a <nK~^S^" foothold and they assume grotesque â' * forms. (Fig. 310.) Try this with peas 314. Germination of cas- . , tor bean. Endosperm ailQ DeanS. ata- 340. The first inter- node above the cotyledonsâbetween the cotyledons and the plumuleâis the epi- cotyl. It elevates the plumule into the air, and the plumule-leaves expand into the first true leaves of the plant. These first true leaves, however, may be very unlike the later leaves. 341. Germination of Bean.â The common bean, as we have seen (Fig. 308), has cotyledons that occupy all the space inside the seed-coats. When the hypocotyl or elongating caulicle emerges, the plumule-leaves have begun to enlarge and to unfold. (Fig. 311.) The hypocotyl elongates rapidly. One end of it is held by the roots. The other is held by the seed-coats in the soil. It, Germination complete ,. . , â ; c , , in castor bean. therefore, takes the form 01 a loop, and. 315. Castor bean. En- dosperm at a, a; co- tyledons at 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan
Size: 1530px × 1632px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
