196 GRAMINEAE. 
x 
70. KORYCARPUS Zea, Act. Matrit. 1806. 
[D1ARINA Raf. Journ. Bot. 2: 169. 1809.] 
[DIARRHENA Beauv. Agrost. 142. 1812.] 
Erect grasses, with long flat leaves and narrow paniculate or racemose inflorescence. 
Spikelets 3-5-flowered, the rachilla readily disarticulating between the flowers. Upper scales 
empty, convolute. Two lower scales empty, the first narrow, 3-nerved, acute, the second 
broader, 5-nerved; flowering scales broader than the lower ones, acuminate or mucronate, 
rounded on the back, finally coriaceous and shining, 3-nerved. Palet 2-keeled. Stamens 2, 
rarely 1. Styles short, distinct. Stigmas plumose. Grain beaked, free. [Greek, in allu- 
sion to the beaked grain. ] 
Two known species, the following North American, the other Japanese. 
i 
1. Korycarpus diandrus (Michx.) Kuntze. American Korycarpus. 
(Fig. 449.) 
Festuca diandra Michx. F1. Bor. Am. 1:67. fl. 70. 1803. 
Korycarpus arundinaceus Zea, Act. Matrit. 1806. 
Diarrhena Americana Beauv. Agrost. 142. pl. 25. f. 11. 
1812. 
Korycarpus diandrus Kuntze, Rev. Gen. Pl. 772. ‘1891. 
Culms 114°-4° tall, erect, simple, very rough below the 
panicle. Sheaths overlapping, confined to the lower 
part of the culm, smooth or a little rough at the summit, 
sometimes pubescent; ligule very short; leaves 8/—24/’ 
long, 5’’-9’’ wide, long-acuminate at the apex, usually 
scabrous; panicle often reduced to a raceme, 2/—7 14’ in 
length, the branches erect, 1’-2’ long; spikelets 3-5- 
flowered, 6’’-8’’ long, the lower scales unequal, the first 
shorter than the second, which is much exceeded by the 
spikelet; flowering scales somewhat abruptly acuminate; 
palets shorter than the scales and exceeded by the 
beaked grain. 
In rich woods, Ohio to Kansas, south to Georgia, Tennes- 
see and the Indian Territory. Aug.—Sept. 
71. PLEUROPOGON R. Br. App. Parry’s Voy. 289. 1824. 
Erect grasses with flat leaves and racemose inflorescence. Spikelets 5~-14-flowered; 
flowers perfect, or the upper staminate. Two lower scales empty, unequal, thin-membran- 
ous, I-nerved, or the second imperfectly 3-nerved; flowering scales longer, membranous, 
7-nerved, the middle nerve excurrent as a short point or awn. Palet scarcely shorter than 
the scale, 2-keeled, the keels winged or appendaged. Stamens 3. Styles short. Stigmas 
plumose. Grain free, enclosed in the scale and palet. [Greek, side-beard, from the append- 
ages to the palets. ] 
Three known species, the following arctic, the others Californian. 
1. Pleuropogon Sabinii R. Br. Sabine’s 
Pleuropogon. (Fig. 450.) 
peprokan Sabinii R. Br. App. Parry’s Voy. 289. 
1824. 
Smooth, culms 6/ or less tall, erect, simple, 
glabrous. Sheaths one or two; ligule 1// long; 
leaves 4/-1/ long, erect, glabrous; raceme I/—2’ 
in length; spikelets 3-6, 5-8-flowered, about 5/’ 
long, on spreading or reflexed pedicels 1/’ or 
less in length; lower scales smooth, the first 
acute, shorter than the obtuse second; flowering 
scales oblong, 2’’-2'3’’ long, erose-truncate at 
the scarious summit, scabrous, the midnerve 
sometimes excurrent as a short point; palet 
slightly shorter than the scale, truncate and 
somewhat 2-toothed at the apex, bearing an awn- 
like appendage on each keel near the middle. 
Arctic regions of both the Old World and the 
New. Summer. 
