112 



GRAMINEAE. 



Vol. I. 



and perfect, the other with a pedicel and either staminate or empty. Scales of the perfect 

 spikelet 4, the outermost thick and coriaceous, covering, together with the pedicel of the 

 sterile spikelet, the excavation in the rachis ; second scale chartaceous ; third and fourth hyaline, 

 the latter subtending the palet and perfect flower. Stamens 3. Styles distinct. Grain 

 free. [Name Greek, meaning hollowed rachis.] 



About 20 species, widely distributed in tropical and temperate countries. 



Leaf -sheaths broad, compressed, keeled; plants without rootstocks. 1. C. rugosa. 



Leaf-sheaths narrow, round, not keeled ; plants with creeping rootstocks. 2. C. cylindrica. 



i. Coelorachis rugosa (Nutt.) Nash. 

 Wrinkled Joint-grass. Fig. 255. 



Rottboellia rugosa Nutt. Gen. 1 : 84. 1818. 

 R. corrugata Baldw. Am. Journ. Sci. 1 : 355. 1819. 

 Manisuris rugosa Kuntze, Rev. Gen. 780. 1891. 

 Manisuris rugosa Chapmani Scribn. Mem. Torr. 



Club 5 : 28. 1894. 

 C. rugosa Nash, N. A. Fl. 17: 86. 1909. 



Smooth and glabrous. Culms 2°-5 a tall, com- 

 pressed, much-branched above, branches spread- 

 ing ; sheaths compressed ; blades flat, acuminate, 

 6'-ii° long, i"-s" wide; racemes partially included 

 in the sheath or more or less exserted, l¥-2i' 

 long ; outermost scale of the sessile spikelet oblong- 

 ovate to ovate, ll"-2l" long, strongly transversely 

 rugose, the wrinkles continuous or interrupted. 



In wet soil along the coast, southern New Jersey 

 to Maryland, Florida and Texas. June-Sept. 



2. Coelorachis cylindrica (Michx.) Nash. 

 Pitted Joint-grass. Fig. 256. 



Tripsacum cylindricum Michx. Fl. Bor. Am. 1 : 60. 



1803. 

 Rottboellia cylindrica Torr. Pac. R. R. Rep. 4: 159. 



i857. 

 Manisuris cylindrica Kuntze, Rev. Gen. 779. 1891. 

 Coelorachis cylindrica Nash, N.A.F1. 17 : 85. 1909. 



Culms from creeping rootstocks, round, i°-3i° 

 tall, slender; blades i° long or less, J"-ii" wide; 

 racemes 4'-8' long, the rachis barely if at all 

 contracted at the nodes ; sessile spikelets 2£"-2-l" 

 long, about equalling the internodes, the first 

 scale more or less pitted in longitudinal lines, or 

 rarely unpitted, the pits often containing a subu- 

 late hair; pedicellate spikelets reduced to I or 2 

 short scales, the pedicel linear, shorter than the 

 sessile spikelet and curved around its margin. 



In sandy soil at low elevations, Georgia and 

 Florida to Missouri, Oklahoma and Texas. Summer. 



3. MISCANTHUS Anderss. Oefv. Sv. Vet.-Akad. Fork 1855 : 165. 1856. : 



Tall erect perennial grasses, with usually flat leaf-blades, and terminal ample commonly 

 hairy panicles. Spikelets i-flowered, unequally pedicellate, arranged in pairs along the con- 

 tinuous branches of the panicle, articulated with the pedicel. Scales 4; outer 2 larger, empty, 

 membranous, muticous; third scale also empty but thinner; fourth scale thinly hyaline, sub- 

 tending a perfect flower, 2-toothed at the apex, the awn arising from between the teeth, 

 usually slender, often with a twisted column at the base and geniculate, sometimes straight, 

 rarely very short or wanting; palet thin, hyaline. Stamens 3. Styjes distinct. Stigmas 

 plumose. [Greek, in allusion to the stalked spikelets.] 



A genus of about 10 species, natives of the Old World. Type species: Eulalia japonica Trin. 



