Electronic Resource
Springer
Plant systematics and evolution
139 (1981), S. 103-111
ISSN:
1615-6110
Keywords:
Angiosperms
;
Rubiaceae
;
Nodal anatomy
;
leaf base
;
stipules
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00983925
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