On Buds and StipulesK. Paul, Trench, Trübner & Company, Limited, 1899 - 239 pagini |
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Pagina 6
... become ripened and brown . The middle line of the sheath -- that is , the line of junction of the two leaves - becomes brown with age while the thicker portion is still green . In other plants , as in Stachys ( fig . 6 ) , the leaves do ...
... become ripened and brown . The middle line of the sheath -- that is , the line of junction of the two leaves - becomes brown with age while the thicker portion is still green . In other plants , as in Stachys ( fig . 6 ) , the leaves do ...
Pagina 17
... become quiescent , and are gradually covered over by the bark . Such buds are known as ' dormant . ' They may remain in the same state for years , but if the growing shoots are injured in the struggle for existence these reserves are ...
... become quiescent , and are gradually covered over by the bark . Such buds are known as ' dormant . ' They may remain in the same state for years , but if the growing shoots are injured in the struggle for existence these reserves are ...
Pagina 44
... become leathery , and thus protect the inner ones ; this is the case with V. Opulus . But that being so , it is an advantage that the inner or true leaves should be folded , because they thus occupy less space . This , perhaps ...
... become leathery , and thus protect the inner ones ; this is the case with V. Opulus . But that being so , it is an advantage that the inner or true leaves should be folded , because they thus occupy less space . This , perhaps ...
Pagina 47
... and almost cover over the growing - point . They gradually elongate ( fig . 61 ) , and from being at first slightly curved round the stem , become folded lengthways or con- duplicate DEVELOPMENT OF LEAVES AND STIPULES 47.
... and almost cover over the growing - point . They gradually elongate ( fig . 61 ) , and from being at first slightly curved round the stem , become folded lengthways or con- duplicate DEVELOPMENT OF LEAVES AND STIPULES 47.
Pagina 48
Sir John Lubbock. round the stem , become folded lengthways or con- duplicate . They are clothed with long , sparse hairs , and show a few teeth , or rather knobs , along the edge , one terminating each of the veins , which are thicker ...
Sir John Lubbock. round the stem , become folded lengthways or con- duplicate . They are clothed with long , sparse hairs , and show a few teeth , or rather knobs , along the edge , one terminating each of the veins , which are thicker ...
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Termeni și expresii frecvente
apex axil axillary buds axis base Beech Bentham blade brown Bud Protection bud-scales Candolle completely covered concave conduplicate connate stipules cotyledons developed edges exstipulate fifth folded foliaceous genera genus glabrous glands growing-point growth Guaiacum officinale hairs hairy Helianthemum Hornbeam Horse Chestnut Hypericum calycinum Illustrations inner instance lamina Lantana lateral buds Lathyrus Lathyrus Aphaca Lathyrus Nissolia leaf leaf-base leaf-blade leaf-stalk leaflets length less lobes lower membranous midrib Monocotyledons narrow node ocrea Opulus outer scales ovate pair of leaves pair of stipules pedestal persistent petiole Petteria PLANE Platanus plant Polygonum protect the bud protect the young Robinia scale fig scar sheath showing side slightly sometimes species St FIG st st stalk stem stipular stipules belonging stipules fig stipules St subulate tendrils terminal bud triangular Tulip Tree upper Viburnum Viburnum Lantana Viburnum Opulus Whitebeam winter winter-bud Wych Elm young bud young leaves Young Shoot younger
Pasaje populare
Pagina 191 - The acacia, however, bears hollow thorns, while each leaflet produces honey in a craterformed gland at the base, and a small, sweet, pearshaped body at the tip. In consequence, it is inhabited by myriads of a small ant, which nests in the hollow thorns, and thus finds meat, drink, and lodging all provided for it. These ants are continually roaming over the plant, and constitute a most efficient body-guard, not only driving off the leaf-cutting ants, but, in Belt's opinion, rendering the leaves less...
Pagina 233 - ... the presence, the uses, and the forms of stipules, and the structure of buds in some of our common trees, shrubs, and herbs. If I shall have induced any of my readers to look at them for themselves in the coming spring they will, I am sure, be amply rewarded. They will often be reminded of Tennyson's profound remark about Nature : So careless of the single life, So careful of the type she seems...
Pagina 68 - Plants, p. 286. -purpwrea, which naturally sink at night (the plants growing out of doors), and looked at them early on several successive mornings, after they had assumed their diurnal positions. The difference in the amount of dew on the pinned-open leaflets and on those which had gone to sleep was generally conspicuous, the latter being sometimes absolutely dry. whilst the leaflets which had been horizontal were coated with large beads of dew. This shows how much cooler the leaflets fully exposed...