40 LEMNACE& (Brown). [ Lemna. 
goog the two species i sone there may be a third one in South 2 
as there isa specimen of L. olz za, Kurz, in the Kew Herbarium 
by Hegeins aier, which is labelled if sf gibba ? Pion te Ecklon and Cee, 
512,” but according toa note written by Hooker he label, and another 
written by Heuelia set, si is des btful if the label sight prion ts o the specimen. 
L. oligorrhiza, Kurz, les L. minor, it isof about the same size, but rather 
more oblong, and di ffors i in ngreee te 2-4 roots to each frond, instead of a single one 
as in L 
Fr wet ane aay flat on both sides ar ) minor. 
Frond thick, very convex and somewhat spongy "beneath ae (2) gibba. 
1. L. minor (Linn. Sp. Pl. ed. 1, 970); fronds —21 lin. long, 
4-12 lin. ‘Sina elliptic, elliptic. oblong , or somewhat obovate, rather 
thin, nearly flat on both sides, bright green ; young fronds sessile ; 
ar solitary from the under surface of each frond ; ovary flask-shaped, 
ith a distinct ee! ovule pee semianatropous Hegelmater, 
‘Monod Lemn, 142, t.9-10. LZ. ovata, A. Braun, ex Krauss in Flora, 
1845, 344. 
South AFRICA: without locality, Ecklon 
: Pg ReGion: Uitenhage Div. ; Zwartkops River, in stagnant places, Krauss, 
EasterN Reaion: Natal; Umgeni River, Drége! Umlaas River, Krauss! 
Port Natal, Gueinzius. 
Widely dispersed in all parts of the globe. 
2. L. gibba (Linn. Sp. Pl. ed. 1, 970) ; fronds 13-8 lin. long, and 
nearly as age subrotund or broadly obovate, very thick, flat and 
bright green above, very convex, greenish- white and somewhat 
spongy beneath ; young fronds sessile ; roots iad from the under 
surface of each fron d; flowers rare. Hegelmater, Monog. Lemn. 145, 
t, 11-13. Telmatophace gibba, Schleid. in Linnea, xiii. 391, 
Soutu AFrica: without opis, Ecklon, Zeyher, B 
Coast Reaion ; Uitenhage Div. ; near the mouth of "the Zwartkops River, 
Drége, 8812! 
Eastern Recion: Port Natal, Gueinzius. 
Widely distributed within the range of the Order. 
II. WOLFFIA, Hook. 
Flowers rarely seen, pe mdeeeat seated in a cavity in the upper 
surface of the frond, without a spathe. Stamen 1; anther 1-celled, 
opening by a slit across the tis and the valves becoming refiexe 
Fronds small or minute, entirely without roots, but in two — a wit t ke 
hair, quite “destit tate of a oe is developed from the under side, floating 0 
ters, thin and flat, or thick as broad, subglobular, hemispherical, 
ellipsoidal, fart e, oblong, or ‘inva, entire, or rarely minutely toothed at the 
margin or 
penis a sameas for Lemna. Species 12. 
Frond minute, at lin. long, 4 lin. broad, nearly as sic as 
ellip’ ess ... (1) Michelii. 
Frond 2-24 iin. ea } lin, broad, lincar ea denticulats. — 
. W. Michelii (Schleid. Beitr. Bot. 233) ; frond minute, 1—} lin. — 
long, about 3 lin. broad, elliptic in outline, nearly as thick as ; broad, 4 
oon 
