Festuca of North America


S. G. Aiken, M. J. Dallwitz, C. L. McJannet, and L. L. Consaul

Festuca rigescens (Presl) Kunth


Rév. Gram. 1: Sup. 31. 1830. Diplanchne rigescens Presl, Rel. Haenk. 1: 260. 1830. Type: Peru. Haenk..


Hitchcock and Chase (1951) described this species as: densely tufted, about 30 cm tall; blades firm, involute, sharp-pointed; panicle narrow, few-flowered, 5 to 10 cm long; spikelets about 3-flowered, 6 to 7 mm long; lemmas ovate, thick convex, awnless to mucronate, 4 to 4.5 mm long. There is a single specimen of this species in the United States National Herbarium, labelled "Arizona, Tracy?". On the sheet is a note made by Professor Piper (Feb. 12, 1904) quoting Tracy, "In open pine woods 4 miles south-east of Flagstaff, about June 20 1887." This agrees exactly with specimens of this species from Peru, whence originally described. Since the species is not known north of Peru, except from this specimen, it seems probable that the label has been misplaced. The first author has not seen this specimen, but speculates from the description and the collection location, that it may be a specimen of F. calligera Rydb.

The interactive key provides access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, and summaries of attributes within groups of taxa.

Cite this publication as: ‘Aiken, S.G., Dallwitz, M.J., McJannet, C.L. and Consaul, L.L. 1996 onwards. Festuca of North America: descriptions, illustrations, identification, and information retrieval. Version: 19th October 2005. http://delta-intkey.com’. Aiken, Dallwitz, McJannet, and Consaul (1997) should also be cited (see References).