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The genus Acacia Miller in South Africa. I. Stipules and spines

  • Robbertse P
Bothalia (1975) 11(4) 473-479
DOI: 10.4102/abc.v11i4.1488
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Abstract

A large number of seedlings and young twigs of South African  Acacia species was sectioned and the vascularization of the nodes and internodes studied. The nodes of all the species examined are trilacunate and the vascular tissue of the stipules originates from the lateral leaf traces. The Gummiferae species all have spinescent stipules, while stipules of the Vulgares species are membranous. Prickles containing no vascular tissue are found on the nodes and in some species also on the internodes of the Vulgares species. These prickles always occur on the ridges formed on the stem by leaf traces.

Figures

  • Fig. I .— Line d iagrams o f a scries o f cross sections o f the seedling axis o f Acacia kraussiana, taken from a ttachm ent of the first two vegetative leaves, dow n to the root. hi. 1, first vegetative leaf; hi. 2, second vegetative leaf; st, s tem; st. bl., stipules; w, x, y, z, vascular bundles o f the stem.
  • Fig 2.— The phyllotaxy and vascularization of a yong stem of Acacia caffra I, schematic diagram of the primary vascular bundles; II, diagram of the phyllotaxy. 1-6, trilacunar nodes.
  • Fig. 3.—Line diagram o f a series o f cross sections th rough the petiole and node o f Acacia caffra. C, section o f proximal part o f petiole; D. E, section o f pu lv inus ; F, G , H, section o f node, fl, ph loem ; gb, g landular body; Ivb, lateral vascular bundle; oks, vascular tissue o f axil lary b u d ; svb, central vascular bund le ; v, fibre cap ; vts, vascular tissue o f stipule; x, xylem.
  • Fig. 4.—Schematic reconstruc tion of the course o f the primary vascular tissue in the node of the stem of Acacia caffra. Small letters, a h, refer to Fig. 1 and capital letters, A H , to Fig.

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APA

Robbertse, P. J. (1975). The genus Acacia Miller in South Africa. I. Stipules and spines. Bothalia, 11(4), 473–479. https://doi.org/10.4102/abc.v11i4.1488

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