*34 FLORA. 



3-9 dm. tall, erect, usually slender. Sheaths rough; leaves rough, 1-2,25 dm. 

 long, 2-10 mm. wide; panicle 8-26 cm. in length, narrow, the branches spreading 

 or ascending, 2.5-5 cm - Ion g5 spikelets about 2-flowered, 7-9 mm. long, nodding, 

 on more or less flexuous pubescent pedicels; empty scales very broad, acutish to 

 obtuse, the second nearly as long as the spikelet or sometimes equalling it; flower- 

 ing scales 6-8 mm. long, generally very obtuse, scabrous. In rich soil, Penn. to 

 Wis., south to Fla. and Tex. June-July. 



80. KORYCARPUS Zea. 



Erect grasses, with long flat leaves and narrow paniculate or racemose inflores- 

 cence. Spikelets 3 -5 -flowered, the rachilla readily disarticulating between the 

 flowers. Upper scales empty, convolute. Two lower scales empty, the first nar- 

 row, 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 i. Styles short, dis- 

 tinct. Stigmas plumose. Grain beaked, free. [Greek, in allusion to the beaked 

 grain.] Two known species, the following North American, the other Japanese. 



i. Korycarpus diandrus (Michx.) Kuntze. AMERICAN KORYCARPUS. (I. F. 

 f. 449.) Culms 4.5-12 dm. tall, very rough below the panicle. Sheaths overlap- 

 ping, confined to the lower part of the culm; leaves 2-6 dm. long, 1-1.8 cm. wide, 

 long-acuminate at the apex, usually scabrous; panicle often reduced to a raceme, 

 5-18 cm. in length, the branches erect, 2.5-5 cm - long; spikelets 3- 5 -flowered, 1.2- 

 1.6 cm. long, the lower scales unequal, the second 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 Neb., south to Ga., Tenn. 

 and the Ind. Terr. Aug.-Sept. \Diarrhena Americana Beauv.] 



81. PLEUROPOGON R. Br. 



Erect grasses with flat leaves and racemose inflorescence. Spikelets 5-i4-flow- 

 ered; flowers perfect, or the upper staminate. Two lower scales empty, unequal, 

 thin-membranous, i-nerved, or the second imperfectly 3-nerved; flowering scales 

 longer, membranous, y-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 appendages to the palets.] Three known 

 species, the following arctic, the others Californian. 



T. Pleuropogon Sabinii R. Br. SABINE'S PLEUROPOGON. (I. F. f. 450.) 

 Smooth. Culms 1.5 dm. or less tall ; sheaths one or two; leaves 6-25 mm. long, 

 erect, glabrous; raceme 2.5-5 cm - * n length; spikelets 3-6, 5-8-flowered, about i 

 cm. long, on spreading or reflexed pedicels 2 mm. in length or less; lower scales 

 smooth, the first acute, shorter than the obtuse second; flowering scales oblong, 4-5 

 mm. long, erose-truncate at the scarious summit, scabrous, the midnerve sometimes 

 excurrent as a short point; palet bearing an awn-like appendage on each keel near 

 the middle. Arctic regions of both the Old World and ths New. Summer. 



82. UNIOLA L. (See Appendix.) 



Erect and often tall grasses with flat or convolute leaves and paniculate inflores- 

 cence. Spikelets 3-many-flowered, flat, 2-edged, the flowers perfect, or the upper 

 staminate. Scales flattened, keeled, sometimes winged, rigid, usually acute ; the 

 lower 3-6 empty, unequal; the flowering scales many-nerved, the uppermost scales 

 often smaller and empty; palets rigid, 2-keeled. Stamens 1-3. Styles distinct. 

 Stigmas plumose. Grain compressed, free, loosely enclosed in the scale and palet. 

 [Name diminutive of unus, one, of no obvious application.] About 8 species, na- 

 tives of America. Besides the following, 2 others occur in the southeastern U. S. 



Spikelets about 6 mm. in length ; panicle spike-like. i. U. laxa. 



Spikelets exceeding 1.25 cm. in length ; panicle open. 



Panicle lax, the branches pendulous; spikelets on long thread-like pedicels. 



2. U. latifolta. 

 Panicle strict, the branches erect, rigid ; spikelets on short stout pedicels. 



3. U. paniculata. 



