278 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 
139. Manisuris L, 
(Rottboellia L. f.) 
Spikelets awnless, in pairs at the nodes of a thickened articulate 
rachis, one sessile and fertile, the other pedicellate and sterile, the 
pedicel thickened and appressed to the rachis. the sessile spikelet 
fitting closely against the rachis, forming a cylindric or subeylindric 
spike: glumes obtuse, awnless, the first coriaceous, fitting over the 
hollow containing the spikelet, the second less coriaceous than the 
first; sterile lemma, fertile lemma, and palea thin and hyaline, in- 
closed within the glumes; pedicellate spikelet reduced, often rudi- 
mentary. 
Perennial slender, moderately tall, or tall grasses, with usually 
numerous smooth cylindric or flattened spikes, single on the culms 
and branches. Species about 30, in the warm regions of both hemi- 
spheres ; 5 in the southern United States. 
Type species : Manisuris myuros L. 
Manisuris L., Mant. PI. 2 : 164. 1771. Only one species described. 
Rottboellia L. f., Nov. Gram. Gen. 22, pi. 1, 1779 (Ainoen, Acad. 10. 1790), 
not Scop., 1777. In a note appended to the description of the genus is the 
statement. " Hue pertinent Aegilops Incurvata & Exaltata S. N., p. 762, aeque 
ac Panicum Dimidiatum S. N., p. 90." The second species, being the one illus- 
trated, is the type. 
Stegosia Lour., Fl. Cochinch. 1: 51. 1790. Type, S. cochinchinensis Lour., 
the only species described. 
Hemarthria R. Br., Prodr. Fl. Nov. Holl. 207. 1810. Two species described, 
E. compressa and H. uncinata. The first species, based upon Rottboellia com- 
pressa L. f., is chosen as the type. 
Lodicularia Beauv., Ess. Agrost. 108, pi. 21, f. 6. 1812. A single species is 
included, L. fasciculata, based on Rottboellia fasciculata Desf. (R. fasciculata 
Lam. evidently intended). 
Coelorhachis Brongn., in Duperr. Bot Voy. Coquille 64. 1829. The type is 
Aegilops muricata Retz., on which is based Coelorhachis muricata, the only 
species described. 
The species of Manisuris found in the United States are nowhere 
abundant and are of little economic importance, though they may 
furnish some forage. Manisuris fasciculata (Lam.) Hitchc. has 
flattened spikes. The other three species have cylindric spikes. 
In these the first glume is variously marked, being somewhat pitted 
in M. cylindHca (Michx.) Kuntze (fig. 168), tessellate in M. tessel- 
lata (Steud.) Scribn., and transversely wrinkled in M. rugosa (Nutt.) 
Kuntze. 
140. Rytiux Raf. 
(Hackelochloa Kuntze. Manisuris of authors.) 
Spikelets awnless, in pairs, the rachis joint and pedicel grown 
together, the two clasped between the edges of the globose alveolate 
first glume of the sessile spikelet; pedicellate spikelet conspicuous, 
staminate. 
A much-branched annual with flat blades, the numerous spikes 
single and more or less inclosed in the sheathing bract, these some- 
