Cortaderia roraimensis (N.E.Br.) Pilg., Notizbl. Bot. Gart. Berlin-Dahlem 6: 112. 1914.

Testoni, Daniel & Linder, H. Peter, 2017, Synoptic taxonomy of Cortaderia Stapf (Danthonioideae, Poaceae), PhytoKeys 76, pp. 39-69 : 63-64

17. Cortaderia roraimensis (N.E.Br.) Pilg., Notizbl. Bot. Gart. Berlin-Dahlem 6: 112. 1914. Fig. 3J

Arundo roraimensis N.E.Br., Trans. Linn. Soc. London, Bot. ser. 2, 6: 74. 1901. Type: British Guiana, summit Mt. Roraima, autumn 1898, F. V. McConnel & J. J. Quelch 673 (lectotype, designated as holotype by Connor & Edgar, Taxon 23: 601 (1974): K!).

Etymology.

- ensis (Latin), denoting place of origin. From Mt Roraima, Guyana.

Taxonomy.

This is the only Cortaderia species from the tepuis. It is very similar to Cortaderia columbiana . It shares with Cortaderia columbiana and Cortaderia bifida a base of dense clustered lacerated sheaths. From the similar Cortaderia columbiana it is separated by the almost absent indumentum on the leaf margin directly above the simple ligule. From Cortaderia bifida it is distinct by the lobed lemma, where the lobes are not extended into slender setae.

The leaf anatomy (Fig. 3J ) follows the same basic plan as that of Cortaderia hapalotricha .

Figures

Figure 3. Leaf anatomy of Cortaderia, as evident from transverse sections. A Cortaderia egmontiana (Moore 2677) B Cortaderia modesta (Glaziou 17913) C Cortaderia hieronymi (Garcia 563) D Cortaderia nitida (Laegaard 53121) E Cortaderia boliviensis (Beck 11273); F Cortaderia sericantha (Ramsay 967); G Cortaderia echinata (Peterson 21587) H Cortaderia bifida (Renvoize 4202) I Cortaderia hapalotricha (Laegaard 53305) J Cortaderia roraimensis (Maguire 60448). Structures referred to in the descriptions are labelled as follows: 1, multi-layered abaxial sub-epidermal collenchyma layer; 2, adaxial islands of collenchyma in the abaxial grooves; 3, chlorenchyma; 4, primary vascular bundle; 5, midrib.