GENERA OF GRASSES OF THE UNITED STATES. 
211 
Perennial, creeping, low or delicate grasses, with narrow, fiat blades 
and terminal and axillary panicles. Species about six, in tropical 
America ; two species in the southern United States. 
Type species: Luziola peruviana Gmel. 
Luziola Juss. ; Gmel. Syst. Nat. 2 : 637. 1791. The genus is first described 
by Jussieu in his Genera Plantarum (1789), but no specific name is mentioned. 
Gmelin assigns a specific name to the species described by Jussieu. 
There are two species in the United States, Luziola peruviana 
(fig. 126), with fruit 2 mm. long, and L. alabamensis Chapm., with 
fruit 4 mm. long, the former from Florida to Louisiana and the latter 
from Alabama. They have no economic importance. 
107. Hydrochloa Beauv. 
Spikelets unisexual, 1-flowered, awnless, disarticulating from the 
pedicel, the plants monoecious; staminate spikelets with a thin 
7-nerved lemma, a 2-nerved palea, and 6 stamens, the glumes want- 
ing; pistillate spikelets with a thin 3-nerved second glume and 5- 
nerved lemma, the first glume and the palea wanting, the stigmas 
long and slender. 
A slender, branching, aquatic grass, probably perennial, the leaves 
floating; staminate flowers in a small few-flowered terminal spike; 
pistillate flowers in few -flowered spikes in the axils of the leaves. 
Species one, in the southeastern United States. 
Type species: Hydrochloa carolinensis Beauv. 
Hydrochloa Beauv., Ess. Agrost. 135, pi. 24, f. 4. 1812. Beauvois figures one 
species, which he names H. carolinensis. The species was first described as 
Zizania fluitans Michx., but this name can not be transferred to Hydrochloa 
because of H. fluitans Host. 
The spikelets of each sex possess but two bracts. From the ap- 
pearance and nervation it is assumed that the palea is present in the 
staminate spikelets and wanting in the pistillate. 
Hydrochloa carolinemis Beauv. (fig. 127) is found in streams and 
ponds from South Carolina to Florida and Louisiana, sometimes in 
sufficient abundance, to become troublesome. It has no economic im- 
portance. 
Pharus L., Syst. Nat., ed. 10, 2:1269. 1759. A tropical American 
genus, one species of which, P. loMfolius L., was included by Chap- 
man in his Flora of the Southern States. The locality given is 
"Orange Lake, Florida (Herb. Thurber)." This West Indian spe- 
cies has not been observed by others in Florida and it should be 
credited to the United States with doubt. 
Rather tall monoecious perennials, with broad elliptic or oblanceo- 
late, petiolate blades and terminal panicles, the large terete pistillate 
spikelets appressed along the rather few stiffly spreading branches, 
