JOURNAL 
OF THE 
WASHINGTON ACADEMY OF SCIENCES 
Vou. 13 OcTOBER 4, 1923 No. 16 
BOTAN Y.—WNew species of plants from Salvador.|. Pau C. STANDLEY, 
U. 8. National Museum. 
The present paper consists of descriptions of new species of plants 
of various families, collected in the Republic of El Salvador by Dr. 
Salvador Calderén, and by the writer in the course of his visit to the 
country during the winter of 1921-22. The description of a new 
species of grass has been contributed by Mrs. Agnes Chase, and those 
of several new Piperaceae and an Agave by Dr. William Trelease. 
Pennisetum vulcanicum Chase, sp. nov. 
Base not seen, plant presumably perennial, probably about 1 meter tall; 
culms erect or ascending, terete and scabrous below the panicle, otherwise 
compressed and glabrous, bearing leafy branches from the lower nodes; nodes 
glabrous; leaves numerous, the sheaths much overlapping, keeled, villous 
along the margin and on the sides of the collar, otherwise glabrous or very 
sparsely pilose; ligule a dense ring of hairs about 1 mm. long; blades rather 
firm, ascending, flat or drying folded, 20 to 45 cm. long, 5 to 8 mm. wide, 
slightly narrower at base than the summit of the sheath, tapering into an 
elongate setaceous scabrous tip, scabrous and papillose-pubescent or papillose 
only on the upper surface, glabrous beneath, the midnerve prominent beneath; 
panicle slightly flexuous, 10 to 17 em. long, 18 to 20 mm. wide excluding the 
longest bristles, tawny or obscurely purple-tinged, rather dense except at 
the base, the axis strongly angled, pilose on the angles; fascicles on hairy 
peduncles 1 to 1.5 mm. long, finally spreading or reflexed; bristles numerous, 
scabrous, united at the very base, very unequal, the outermost short, slender, 
scabrous only, the inner 1 to 1.5 cm. long, flattened, flexuous, plumose about 
half their length, the innermost one stouter, 2 to 5 cm. long, plumose at base, 
unequal in fascicles of the same panicle, the longer in the middle fascicles; 
spikelets 3 to 5 in each fascicle (only 1 or 2 well developed), sessile, 6 to 9mm. 
long, about 1.4 mm. wide, attenuate, scaberulous; glumes attenuate, 3 to 5- 
nerved, the first 1 to 4, the second 2 to 3, as long as the spikelet; sterile lemma 
nearly as long as the fertile, finely many-nerved, inclosing a palea of nearly 
1 Published by permission of the Secretary of the Smithsonian Institution. 
363 
