Plant World; Its Past, Present & Future; An Introd. to the Study of Botany
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In our eReader you can find the full English version of the book. Read Plant World; Its Past, Present & Future; An Introd. to the Study of Botany Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Plant World; Its Past, Present & Future; An Introd. to the Study of Botany
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make the best of whatever set of surroundings they may encounter, the result being that there are at least ten thousand known species, or about one-tenth of all known flowering plants scattered over the surface of the globe.
It has been stated that ants and minute insects are as a rule useless in effecting the cross-fertilization of flowers, except in the case of some of the less differen- tiated open kinds; and in the more highly evolved types very varied arrangements are present for the purpo...se of preventing such creeping insects from reaching the in- florescence. Amongst such contrivances may be noted the presence of a viscid substance on the stem, or the presence of numerous hairs pointing downwards and becoming longer and more numerous in the region of the flowers, as in the cow-parsnip (Heracleum spliondy- lium). In the wild teasel (Dipsacus sylvestris), the opposite pairs of leaves are adherent to each other by their margins for some distance, forming a receptacle capable of holding a considerable quantity of water that surrounds the stem just above the origin of the leaves, and any insect creeping up the stem as far as the first pair of leaves is confronted with this miniature pool, which must be crossed before the stem can again be reached ; and as there are usually from six to eight pairs of leaves, each with its pool of water, it can be under- stood that insects incapable of flight, and at the same time not possessed of natatory powers, rarely reach the inflorescence at the top of the stem.
What to read after Plant World; Its Past, Present & Future; An Introd. to the Study of Botany?
You can find similar books in the "Read Also" column, or choose other free books by George Massee to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
make the best of whatever set of surroundings they may encounter, the result being that there are at least ten thousand known species, or about one-tenth of all known flowering plants scattered over the surface of the globe.
It has been stated that ants and minute insects are as a rule useless in effecting the cross-fertilization of flowers, except in the case of some of the less differen- tiated open kinds; and in the more highly evolved types very varied arrangements are present for the purpo...se of preventing such creeping insects from reaching the in- florescence. Amongst such contrivances may be noted the presence of a viscid substance on the stem, or the presence of numerous hairs pointing downwards and becoming longer and more numerous in the region of the flowers, as in the cow-parsnip (Heracleum spliondy- lium). In the wild teasel (Dipsacus sylvestris), the opposite pairs of leaves are adherent to each other by their margins for some distance, forming a receptacle capable of holding a considerable quantity of water that surrounds the stem just above the origin of the leaves, and any insect creeping up the stem as far as the first pair of leaves is confronted with this miniature pool, which must be crossed before the stem can again be reached ; and as there are usually from six to eight pairs of leaves, each with its pool of water, it can be under- stood that insects incapable of flight, and at the same time not possessed of natatory powers, rarely reach the inflorescence at the top of the stem.
What to read after Plant World; Its Past, Present & Future; An Introd. to the Study of Botany?
You can find similar books in the "Read Also" column, or choose other free books by George Massee to read onlineMoreLess
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