162 CXXXVII. LEMNACER. 
1. WOLFFIA, Horkel. 
Fronds minute, emitting no fibres. Flowers bursting from a cavity 
>. the upper surface of the frond, without any spatha or bract. Anther 
1, globular, nearly sessile, opening in 2 valves. ay globular with 
a single erect ovule; style short with a broad stigm 
1. W. arrhiza, Wimm. ; Hegelm. Lemn., 124, t. 2,3, var. austri- 
liana.— Fronds mostl Woi line diameter, as h oad as long, very 
thin except the thickened side whence the new frond arises, whilst in 
the typical JF. arrhiza they are scarcely above 3 line diameter and thick 
all over. Fructification of the Australian form unknown.— Lem 
arrhiza, Linn.; Wolfia Michelii, Schleid.; F. Muell. Fragm. Vii 
187. 
Victoria. Mount Emu Creek, where it is not mixed with other em = 
Piers. and swamps near Mount Gilibran d, mixed with Lemna minor, F 
Mueller. 
F. Muell r, Fragm. viii. 188 informs us that Hegelmaier, to whom he appears 
have pao ated specimens of the plant, could not in the barren state he 
fronds safely distinguish it from JW. dri hice, aBiough: it looks very different fini 
allour specimens of that species whether from Europe or East India. I do not it 
however any single frond attaining 1 to 13 linesasdescribed by F. Mueller, nor ol 
one twice as long as broad, tho Aur jme and there two dei are closely joi? 
together so as almost to 1 look like o 
2. LEMNA, Linn. 
Fronds emitting one or more root fibres from their um 
face. Flowers iss uing fro piai in pai margin of the a 
Anthers with 2 distinct cells, pire open n two valves, at the € 
of a distinct filament. Style short or ES or in lengthened. 
Geographical distribution that of the Order. 
mod one to each frond 
oblo ong | or narro one end, the 
"young e ones often projecting on hes dde at both ends. 
1. Z. trisulea. 
Fronds an ovate, rather thin, slightly | convex under- 
neath, the on . 
A yo ang es soon detached from one LN A L. em 
Tenda Beg L minor r but rather thicker, Ovules 2 or PA 
LI Li . . * . . . . H 3. oe g t s 
Root-fibres li te r under each frond. D rRBÉ 
ds thin, oval or iive rarely above : lines long . . 4. L. oligorr 
Faik Pegen — orbi. "c nearly 3 lines à 
diameter kar "eme pss E PE 
L. trisulc inn. ; , Hegelm. Lemn. 184, - 
oblong or lanceolate, often 1 im. lo ong and sbout ad an ps 
thin, w and minutely toothed at one end and ending in 4 
stalk at the other, with 2 young ones usually growing from spo 
sides and remaining long adherent, and emitting a single 
