Der Knotenbau einigerRubiaceae |
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Authors: | H F Neubauer |
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Institution: | (1) Botanisches Institut, Justus-Liebig-Universität, Senckenbergstraße 17-21, D-6300 Gießen, Bundesrepublik Deutschland |
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Abstract: | The leaf base vascularization in most of theRubiaceae corresponds to the unilacunar pattern with one complex trace. Only some species are known to have a trilacunar nodal pattern with three traces. In the unilacunar type one pair of smaller bundles separates from the complex lacunary leaf trace laterally, each soon forking into two arms: One arm becomes a marginal vein of the petiole, the other, besides supplying the stipules, forms a ± distinct vascular bridge within the cortex of the nodal flanks. In theRubieae this flank bridge develops as a very distinct vascular ring commissure out of which the whorled leaf-like appendages are vascularized; only the opposite true leaves receive their complex trace out of the lacunes directly. Axillary branches originate only from these true leaves. |
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Keywords: | Angiosperms Rubiaceae Nodal anatomy leaf base stipules |
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