Synoptic taxonomy of Cortaderia Stapf (Danthonioideae, Poaceae) Author Testoni, Daniel Herbario BBB, Departamento de Biologia, Bioquimica y Farmacia, Universidad Nacional del Sur, San Juan 670, CP- 8000 Bahia Blanca, Argentina daniel.testoni@uns.edu.ar Author Linder, H. Peter Department of Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland text PhytoKeys 2017 2017-01-11 76 39 69 http://dx.doi.org/10.3897/phytokeys.76.10808 journal article http://dx.doi.org/10.3897/phytokeys.76.10808 1314-2003-76-39 FFBD980EFF8A8924FFD5FF9FFF903809 238999 10. Cortaderia sericantha (Steud.) Hitchc., Contr. U.S. Natl. Herb. 24: 348. 1927. Figs 1I , 3F Danthonia sericantha Steud., Syn. Pl. Glumac. 1(3): 246. 1854. Type: Ecuador, Quito "On boggy plains on the eastern Cordillera at 13000 feet above sea level", sine data, W. Jameson 93 (lectotype designated by Connor & Edgar, Taxon 23: 602 (1974): K!; isolectotypes: K! - frag US!, OXF!, TCD!). Danthonia jubata Sodiro, Revista Colegio Nac. Vicente Rocafuerte 12: 91. 1930. Type: Ecuador, Pinchincha, sine data, A. S. J. Mille s.n. (NY, MO photo!, US!). Etymology. serios (Greek) = silken + Anthos (Greek) = flower. Presumably this refers to the silky-haired leaves, a diagnostic trait for this species. Taxonomy. This species is very distinctive in Cortaderia by its very villous leaves, which are rolled rather than flat, and quite pungent; the compact inflorescences with short inflorescence branches; the glumes with three veins and which are much longer than the packet of florets; and the tuft of hair at the base of the spikelets. The inflorescences are similar to those of Cortaderia egmontiana , but the villous leaves immediate distinguish our species from Cortaderia egmontiana . The intact leaf sheaths, pungent leaf tips, and compact growth form related this species to Cortaderia pungens and Cortaderia echinata . The remarkably large glumes, much overtopping the packet of florets, are shared with Cortaderia echinata . The leaf anatomy (Fig. 3F ) could be unique in the genus. The abaxial half of the leaf, in cross-section, consists of colourless collenchyma. The vascular bundles are very slender, and the girders taper towards the adaxial epidermis. Adaxially the leaves are only very slightly grooved.