832 CXLII. LEMXACE^. 



The young fronds I'ise at right angles from one or both sides of the 

 parent frond and remain connected with it crosswise. Fl. B. I. v. G, 

 p. 557 ; Dalz. & Gibs. p. 281 ; Eugler, in Engl & Prantl, Pilanzenf. 

 V. 2, part 3, p. 160, fig. 104 ; Sj-me, Eng. Bot. ed. 3, v. 9 (1869) p. 17, 

 t. 1394 ; Boiss. El. Orient, v. 5, p. 29 ; Prain, Beng. PI. p. 1116 ; Watt, 

 Diet. Econ. Prod. v. 4, p. 620. 



In ponds and tanks in the Konkan, not common. — Distrib. Temperate and tropical 

 regions. 



2. Lemna gibba, Limi. Sp. PL (1753) p. 970. Fronds floating, 

 suborbicular or obovate, entire, not tailed, ^-^ in. in diam., opaque, 

 thick, flat above, at length very convex beneath, the young fronds 

 sessile, each giving rise to a single root-fibre, the under surface at length 

 spongy and greatly swollen; root-sheath elongate, cylindric ; root-cap 

 acute. Stamens 2. Utricle opening circumscissilely. Seeds erect, 

 anatropous ; albumen scanty or 0. El. B. I. v. 6, p. 556 ; Woodr. in 

 Journ. Bomb. Nat. v. 13 (1901) p. 428 ; Boiss. El. Orient, v. 5, p. 30; 

 Watt, Diet. Econ, Prod. v. 4, p. 620; Syme, Eng. Bot. ed. 3, v. 9 

 (1869) p. 22, t. 1396.— Flowers : Sept. 



Deccau : Boshri near Poona, Woodrow, — Distrib. Cosmopolitan. 



3. Liemna polyrhiza, Linn. Sp. PI. (1753) p. 970. Fronds 

 herbaceous, not tailed, floating, opaque, thick, flat above, slightly convex 

 below, -l— ^ in. in diam., dark green above, usually purplish beneath, 

 7-veined ; epidermal cells with sinuous walls ; young fronds sessile, 

 each frond giving rise to a tuft of root-fibres. Spathe 2-lipped. 

 Stamens 2. Ovules 1-2, semianatropous. El. B. I. v. 6, p. 557 ; Trim. 

 Fl. Ceyl. v. 4, p. 367; Woodr. in Journ. Bomb. Nat. v. 13 (1901) 

 p. 428 ; Prain, Beng. PL p. 1117 ; Watt, Diet. Econ. Prod. v. 4, p. 620 ; 

 Syme, Eng. Bot. ed. 3, v. 9 (1869) p. 23, t. 1397. Spirodela jwh/rhiza, 

 Schleid. in Linn^a, v. 13 (1839) p. 392; Engler, in Engl. & Prantl, 

 Pflanzenf. v. 2, part 3, p. 154, fig. 101 A.— Flowers : Sept. 



Deccan : Poona, Woodrow. — Distrib. Cosmopolitan. 



2. WOLFPIA, Horkel. 



Very minute herbs, flattish, globose or conically produced below, 

 rootless. Flowers inserted in a groove on the upper surface of the 

 plant. Spathe 0. Ma.le flower solitary. Stamen solitary ; filament 

 short or long ; anther globose, 1-celled ; pollen smooth. Female 

 FLOWER solitary, close to the male. Ovary globose or ovoid ; ovule 

 solitary, orthotropous. Fruit a spherical utricle. Seed globose, erect ; 

 testa thick ; albumen scanty. — Distrib. Europe, East Indies, Tropical 

 Africa, Tropical and Temperate America ; species 12. 



1. Wolffia Michelii, Schleid. Bcitr. Bot. (1844) p. 233. A minute 

 floating annual h(^i-b. I'ronds opaque, ovate-oblong or subglobose, -rr,-, in. 

 long or less, convex on both surfaces, not tailed, rootless ; young fronds 

 solitary and sessile from the very base of the parent frond. Jackson, 

 Index Kewen. v. 4 (1895) p. 1233. Wolffia arrhiza, Ilork. ex Wiin. 

 Fl. Schles. ed. 3 (1857) p. 140 ; Hook. f. Fl. B. I. v. 6, p. 557 ; AVoodr. 



