172 BULLETIN 772, U. S: DEPARTMENT OF AGRICULTURE. 
times short panicle. Species probably 20, in the warmer regions; 
10 species in the United States, mostly in the Southern and South- 
western States. ; 
Type species: Cynosurus virgatus L. 
Leptochloa Beauy., Hss. Agrost. 71, 166, pl. 15, f. 1. 1812. Beauvois includes 
three species, Cynosurus capillaceus, Hleusine filiformis, and H. virgata, all of 
which appear in the index under Leptochloa. The third species is figured and 
hence is selected as the type. 
Diplachne Beauv., Hss. Agrost. 80, pl. 16, f. 9. 1812. The type is Festuca 
fascicularis Lam., the only species mentioned. This is figured by Beauvois. 
Rabdochloa Beauv., Hss. Agrost. 84, pl. 17, f. 3. 1812. Beauvois includes 
Cynosurus monostachyos, C. virgatus, C. domingensis, C. cruciatus, and C. 
mucronatus, the last two with question. The species figured, C. domingensis, 
in the explanation to the plates called Rabdochloa domingensis, is selected as 
the type. 
Oxydenia Nutt., Gen. Pl. 1: 76. 1818. Only one species included, O. at- 
tenuata, which is Leptochloa filiformis. 
Some authors* recognize Diplachne as a distinct genus, including Leptochloa 
fascicularis, L. floribunda, and L. dubia. In this group the spikelets are some- 
what pediceled and are less distinctly arranged in one-sided spikes. Those 
who recognize the genus place it in the tribe Festuceae. 
Leptochioa filiformis (Lam.) Beauv. (fig. 101) is an annual with 
papillate-pilose sheaths, small spikelets, the awnless florets shorter 
than the glumes, and numerous very slender spikes 3 to 6 inches long 
arranged in a panicle as much as a foot long. This is a weed in 
cultivated soil from Virginia to Florida and California; common 
also in the Tropics; sometimes called red sprangle-top. 
Leptochloa fascicularis (Lam.) Gray is a smooth, erect or pros- 
trate annual with several-flowered spikelets, the awned florets longer 
than the glumes; found in ditches and brackish meadows from 
Massachusetts to Florida and New Mexico. 
The other species are more local. Two perennials, Z. domingensis 
(Jacq.) Trin. and Z. virgata (L.) Beauv., are tropical species which 
reach the United States in southern Florida and southern Texas, 
respectively. Leptochloa dubia (H. B. K.) Nees, a perennial with 
comparatively few spikes and broad lemmas notched at the apex, the 
nerves glabrous (the margin pubescent), is found in Florida and 
from Texas to New Mexico. In the Southwest it is called sprangle 
or sprangle-top and Texas crowfoot, and it is important as a forage 
erass. 
For a revision of the species of Leptochloa found in the United 
States, see Hitchcock, U. S. Dept. Agr., Bur. Pl. Ind. Bull. 33. 1908. 
83. Trrpogon Roth. 
Spikelets several-flowered, nearly sessile, and appressed in two rows 
along one side of a slender rachis, the rachilla disarticulating above 
the glumes and between the florets; glumes somewhat unequal, 
acute or acuminate, narrow, 1-nerved; lemmas narrow, 8-nerved, 
1 Nash in Small, Fl. Southeast. U. S. 145, 1903; in Britt. and Brown, Illustr. Fl., ed. 2, 
1:2386. 1918. 
