This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1866 Excerpt: ...network, dividing and subdividing from the midrib or main vein, while in endogens the veins of the leaves are generally parallel with the midrib, and not subdivided; and in acrogens the leaves (when there are any), are either not veined at all, or have only one or two very simple veins, either straight or forked. The ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1866 Excerpt: ...network, dividing and subdividing from the midrib or main vein, while in endogens the veins of the leaves are generally parallel with the midrib, and not subdivided; and in acrogens the leaves (when there are any), are either not veined at all, or have only one or two very simple veins, either straight or forked. The flowers in exogens have generally either 4 or 5 sepals, petals, and stamens, or some multiple of 4, as 8 or 12; or of 5, as 10 or 15; while eudogens have generally their sepals, petals, and stamens arranged in groups of 3,6, or 9. The acrogens have no flowers, and therefore no sepals, petals, or stamens at all. The fruit in exogens differs from the fruit in eudogens, in the fact that the seed in an exogen fruit has always two cotyledons or seed leaves, (that is two seed leaves that appear above ground when the seed first begins to grow, and which do the work of regular leaves, until these regular leaves have time to grow), while the seed of an endogen plant has only one, and the seed of an acrogen none at all. 62. These differences are shewn altogether, thus: --From the number of seed leaves in the fruit, another name is given to these great classes of exogens, endogens, and acrogens. The seed leaves being called cotyledons. Exogens, which have 2 seed leaves, are called dicotyledons (di meaning two); endogens, which have 1 seed leaf, are called mono-cotyledons (mono meaning one;) and acrogens, which have no seed leaves, are called a-cotyledons (a meaning without any). 63. So that the division of plants into these three great classes may also be shewn thus: --From this it will be seen that an exogen is also a dicotyledon, "exogenousplant" being only another name for "di-cotyledonous plant;" also endogen and monoco...
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Add this copy of A First Book of Botany to cart. $56.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
