J06 LEMN ACE. [| WoLFFTA. 
Dehra Dun (Parker). Moradabad (Thomson). Merwara (Duthie 4899), 
Haldwani (Parker). Common on ponds and in shallow sluggish 
streams. Flowers October. DisTris.: Cosmopolitan, tropical. ° 
2. L. trisulea, Linn. Fl. Brit. Ind. vi, 557 ; Prain, Beng. Pl. 
1117 ; Cooke, Fl. Bomb., vi, 831. 
Fronds 3-3 in. long, oblanceolate, the tip serrulate, daughter fronds 
hastately attached to the parent shoot. Root-cap acute. Ovule 
solitary, semianatropous. 
Has not yet been collected in this area. DisTR1B.: Persia, Manipur, 
China, etc. 
Lemna gibba, Linn. is mentioned in the Fl. Brit. Ind. as occurring 
throughout India but there seem to be no Indian specimens in 
herbaria. Fronds suborbicular, very convex and _ greenish-white 
beneath. Root-sheath elongate, cylindric, root-cap acute. Ovules 
2-6, anatropous. Cooke, Fl. Bomb. ii, 832, records it for the Deccan. 
8. WOLFFIA, Horkel.; FL Brit. Ind. vi, 557. 
The smallest of the flowering plants consisting of minute fronds 
producing a daughter shoot in the median line at the hinder end, 
Flowers breaking through the upper surface of the frond consist- 
ing of a single male flower or stamen and one female flower or 
pistil. Anthers in an early stage 2-celled but soon appearing one- 
celled. Ovary with one orthotropous ovule. Species 12, mainly 
tropical. 
Fronds subglobose beneath . 3 . - iL. W. arrhiza. 
Fronds conical or subcylindric beneath - 2. W. microscopica, 
1. W. arrhiza, Wimm. Fl. Brit. Ind. vi, 557 ; Prain Beng. Pl. 
117. W. Michelii, Schleid. Cooke Fl. Bomb. u, 832. 
Fronds = in. long, subglobose or somewhat oblong, convex 
above, globose beneath. 
Dehra Dun (Parker). Distris.: Europe, Bengal common, Kurz. 
Bombay Tanks throughout the presidency common, covering the 
water like a green scum, Cooke. 
id . 
2. W. microscopica, Kurz. Fl. Brit. Ind. vi, 558; Prain, Beng. 
Pl. 1117. 
Fronds ¢ inch long, flat above with a more or less conical rootlike 
process beneath usually twice as long as the frond. 
