— 
MR. G. BENTHAM ON GRAMINE EX. 55 
plant, and possibly also South- A merican, if Sello's single specimen 
described by Trinius and figured by Doell as Z. microstacyhs, 
Nees, was really from South Brazil. 1 see nothing in the figure 
or description to distinguish it from Z. miliacea. 
3. Luzrora, Juss., has, like Zizania, unisexual spikelets with 
only two glumes; but the spikelets are smaller, not awned, the 
styles short and quite distinct, and there are usually more than 
six stamens in the males. Six species are known from tropical 
America or the southern States of North America. The relative 
arrangement of the males and females varies as in Zizania. In 
the typical L. peruviana, Juss. (L. brasiliensis, Moric.), in L. ala- 
bamensis, Chapm., and in an apparently unpublished Guiana 
species, both sexes are in terminal panicles, but on distinct stems. 
In L. Spruceana, Benth., described by Doell (figured by G. F. W. 
Meyer as L. peruviana, but not Jussieu's plant), the males are in 
a terminal panicle, whilst the females are in the lower axils of 
the same stem, as they are also said to be in L. longivalvis, Doell, 
a Brazilian plant which I have not seen. In the proposed genus 
Caryochloa, Trin. (Arrozia, Schrad.), also Brazilian, the males and 
females are in the same panicle, the former in the upper, the latter 
in the lower part. The stamens in this species appear also to be 
always six only, which only occasionally occurs in the others ; but 
the other characters are entirely those of Zuziola, to which I 
should unite the Caryochloa as L. micrantha (Arrozia micrantha, 
Schrad.). 
4. PoTAMOPHILA, Br., if we include in it Maltebrunia, Kunth, 
is a natural genus of three species, connecting in some measure 
Zizania, of which it has the habit, with Oryza, of which it has the 
small setaceous or acuminate outer glumes. In the typical 
P. parviflora, Br., from Australia, the spikelets are more or less 
polygamous, though the greater number appear to be her- 
maphrodite ; in P. leerszoides (Maltebrunia leersioides, Kunth) 
from Madagascar, and in P. prehensilis (Maltebrunia prehensilis, 
Nees) from South Africa, they are usually all, or nearly all, her- 
maphrodite. Kunth also distinguishes Potamophila from Malte- 
brunia as having two flowers to the spikelet, a character not 
mentioned by Brown and which I have been unable to verify. 
The spikelets figured by Kunth, Rev. Gram. t. 5. figs. 1, 2, & 5, 
must be very rare and probably abnormal; I have searched in 
vain for them both in Brown's and in Beckler's specimens. 
5. Hyaroruiza, Nees (Potamochloa, Griff.), is a single East- 
