Juncaceae Phylogeny Group

Juncus anatomy

1) Case study of Juncus uruguensis Griseb. - a member of the section Juncotypus (Juncaceae, Juncus subg. Agathryon Raf.)   (Drábková et Kirschner, 2004)

Anatomy and morphology of Juncus uruguensis Griseb. were studied in order to determine the sectional position of the species. Leaf anatomy (Fig. 1), a decisive criterion for sectional classification in the subg. Agathryon, shows that the species should be placed in the sect. Juncotypus, not in the sect. Steirochloa.

Juncus uruguensis is characterized by the following features of leaf anatomy: Leaf T.S. is not round (it is usually ± elliptic, see also Fig. 1) but is polysymmetric, with distinct grooves and ridges; there is no possibility to distinguish adaxial side of leaf. Cellulae bullatae are absent, vascular bundles are arranged in one subepidermal circle, and are connected to epidermis by broad strands of sclerenchyma. Separate sclerenchyma strands are lacking. Bundle sheaths are parenchymatous. Pith is parenchymatous, later coalescent. Epidermis is formed by small cells and covers the entire blade surface. Epidermal cells are slightly enlarged on the ridges.

When the leaf T.S. characters of J. uruguensis are compared with those given in the, J. uruguensis is to be classified as a member of the sect. Juncotypus. The other characters either point to the sect. Juncotypus or are intermediate between the two sections.

Fig. 1




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