VOL. XVIII, PP. 143-150 JUNE 9, 1905 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON NEW AND INTERESTING AMERICAN GRASSES. BY C. V. PIPER. The following miscellaneous descriptions and notes are part of the results of studies incidental to general systematic work upon American grasses during the past year. They are pub lished at the present time principally because the projected monographs of several of the genera have been discontinued by the writer. The types of all the new species are in the National Herbarium . Epicampes leptoura sp. nov. Habit of E. rigens Benth. Culms rather stout, about a rneter high, terete, scabrous, three-jointed. Sheaths smooth, longer than the internodes ; ligule membranous, obtuse or retuse, 2-3 mm. long ; blades very narrow, strongly involute, harshly scabrous, the lower ones 30 to 40 cm., the upper most about 10 cm. long. Panicle spike-like, erect, narrow, pale, densely flowered, sometimes interrupted below, 10 to 25 cm. long, 5 to 6 mm. thick; rays closely appressed, the longest 1 cm. long. Empty glumes lanceolate, scabrous on the keels, exceeding the floret, the lower 4 mm. long with an awn 1 mm. long, the upper 3.5 mm. long with a flexuous awn of equal length ; flowering glume minutely scabrous, 2 to 2.5 mm. long, ovate, truncate, three-nerved, bearing a very short awn from the back near the apex ; palet as long or slightly longer, the two nerves meeting at the acute apex. Related to E. rigens Benth, but easily distinguished by the awned glumes. Collected by C. H. Townsend and C. M. Barber, in the Sierra Madre near Colonia Garcia, Chihuahua, Mexico, No. 341, September 21, 1899, altitude 7,000 feet (Type). 24 PROC. BIOL. Soc. WASH., VOL. XVIII, 1905. (143)
BioStor
