. Les usines britanniques ; leur biologie et leur écologie. La botanique, la botanique, écologie végétale. Plantes grimpantes 119 tion est pris en charge par les stipules, qui sont grandes et feuille-hke. (Ii.) Stipules.-Dans la salsepareille (smilax), un grimpeur, souvent vu dans les serres, l'tendrUs" sont dans la posi- tion de stipules. Crochets d'escalade peuvent également être présents. (Iii.) Leaf-Tips-, dans l'escalade lily (Gloriosa superba), un autre gaz à effet de l'étranger-usine, l'extrémité des feuilles sont longues en corde solide-comme tendrUs. (Iv) les pétioles.-^le jardin - nasturtium {Tropceolum majus) et les clématites ont des feuilles sensibles-tiges. O

• Contributeur: The Book Worm / Alamy Banque D'Images
• ID de l’image: RDWB21
• Taille du fichier: 7,1 MB (169,8 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 986 x 2533 px | 8,3 x 21,4 cm | 3,3 x 8,4 inches | 300dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. British plants; their biology and ecology. Botany; Botany; Plant ecology. CLIMBING PLANTS 119 tion is taken over by the stipules, which are large and leaf-hke. (ii.) Stipules.—In Smilax (sarsaparilla), a climber fre- quently seen in greenhouses, the tendrUs are in the" posi- tion of stipules. Climbing hooks may also be present. (iii.) Leaf-Tips, —In the climbing lily (Gloriosa superba), another foreign greenhouse-plant, the tips of the leaves are prolonged into strong cord-like tendrUs. (iv.) Petioles.—^The garden - nasturtium {Tropceolum majus) and Clematis have sensitive leaf-stalks. On reach- ing a support, they curve round it, and then become tough and indurated, thus enclosing it firmly. 4. Root - Climbers. — These climb by adventitious roots, which arise in great number on the shaded side of the stem. They act as suckers, pinning the branches to the wall or to the tree up which the plant climbs—e.g., ivy (Hedera Helix). No suckers, however, occur on the flowering shoots, which turn away from the wall and grow outwards towards the light. In many plants the morphological nature of the tendrU is doubtful. In the vegetable-marrow {Cucurhita), cucumber (Cucumis), white bryony (Bryonia dioica), and other Cucurbitacese, the tendrils have been variously described as modified leaves, stipules, shoots, and even roots. It is possible, however, that in these cases the tendrils are not modified forms of other organs at all, but are organs, sui generis (Latin, of their own kind)—that is, organs which have arisen and have been developed for the purpose which they serve, never having been anything else but what they are. Chmbing plants begin their existence as deep-shade plants, the shade being produced by the vegetation upon which they chmb. In the Tropics most are inhabitants of forests ; in this country they are found in thickets and hedges. Here the partial light produces effects which are ordinarily associated with plants grown in darkness. Such plants

Recherche dans la banque de photos par tags

• bookcentury1900
• bookdecade1920
• booksubjectbotany
• bookyear1920