GENERA OF GRASSES OF THE UNITED STATES. 
135 
apex, bearing from between the teeth a slender bent awn, twisted at 
base; palea a little shorter than the lemma. 
A slender annual with flat blades and narrow panicles. Species 
one, Florida to Texas. 
Type species : Grcenia arkansana 
Nutt. 
Greenia Nutt., Trans. Amer. Phil. Soc. 
5: 142, 1837, not Greenea Wight find 
Arn., 1834. Type G. arkansana, the only 
species described. 
Sclerachne Torr. ; Trin., Mem. Acad. 
St. Petersb. VI. Sci. Nat. 4 1 : 273, 1841, 
not Sclerachne R. Br. and Benn., 1838. 
'Two species are described, 8. arkansana 
Torr. and S. pilosa Trin. The first, 
based on Greenia arkansana Nutt., is 
the type. 
Thurberia Benth., Journ. Linn. Soc. 
Bot. 19: 58, 1881, not Thurberia A. 
Gray, 1854. Type Greenia arkansana 
Nutt, the name Thurberia being substi- 
tuted for Greenia. 
Limnodea L. H. Dewey, Contr. U. S. 
Nat. Herb. 2: 518. 1894. Only one spe- 
cies described. 
Limnodea arkansana 
(Nutt.) L. H. Dewey 
(fig. 73), has probably 
no agricultural value. 
A form with pilose 
Fig. 73. — Limnodea arkansana. Plant, X I, ; spikelet and floret, X 5. 
