Lemnti.'] CLXVII. LEMNACE/E. (J. D. Hooker.) 557 



obovoid tumid beneath, ovules 2-7. Seichb. Ic. Fl. Germ. vii. 1. 14 ; Boiss. 

 FL Orient, v. 30 ; Hegelm. Lemnse, 145, t. 11-13. Telmatophace gibba, 

 Schleid. in Linn<ea, xiii. 391 ; Kunth Enum. iii. 6 ; Kurz in Journ. Linn. 

 Soc. ix. 266. Lemna, Griff. Notul. iii. 221 (2nd species), Ic. PL Asiat. t. 

 263. 



Still waters throughout INDIA, ascending to 7000 ft. in the Himalaya. DISTBIB. 

 Cosmopolitan. 



Frond \-% in. diam., opaque, young sessile, cells beneath very large, epidermis 

 with flexuous walls. Hoot-sheath elongate, cylindric, root-cap acute. Stamens 2. 

 Utricle circumciss. Seeds erect, anatropous, albumen scanty or 0. 



4. Zi. trisulca. Linn. Sp. PI. 970 ; root solitary, frond oblanceolate 

 tip serrate young hastate persistent, ovule solitary. Kunth Enum. iii. 5 ; 

 ReicJib. Ic. Fl. Germ. vii. t. 15 ; Hegelm. Lemnas, 134, t. 5, 6 ; Boiss. Fl. 

 Orient, vi. 29 ; Dalz. & Gibs. Bomb. Fl. 281. L. cruciata, Eoxb. Fl. Ind. iii. 

 566. Lemna, Griff. Notul. 218 ; Ic. Plant. Asiat. t. 262. 



PANJAB, Stetvart. BENGAL, The CONCAN, MUNNEPOEE, and BUBMA. DISTBIB. 

 Temp, and trop. regions. 



Fronds ^-f in. long, young on one or both sides placed cross-wise to the old ; 

 epidermis 0. Hoot-cap acute. Style very short. Seed hemianatropous, horizontal ; 

 testa rough, grooved. 



5. Zi. polyrrhiza, Linn. Sp. PI. 970 ; roots many, frond herbaceous 

 broadly obovate or orbicular flat or nearly so 7-nerved, ovules 1-2 erect. 

 Seichb. Ic. Fl. Germ. vii. t. 15 ; Thw. Enum. 331 ; Kurz in Journ. Linn. 

 Soc. ix. 267. L. orbiculata, Roxb. Fl. Ind. iii. 565. L. major, Griff. Notul 

 iii. 216; Ic. Plant. Asiat. t. 264 (anal.}. Spirodela polyrrhiza, Schleid. 

 in Linnsea, xiii. 392 ; Kunth. Enum. iii. 7 ; Hegelm. Lemnse, 151, t. 13-15 ; 

 Boits. Fl. Orient, v. 30. 



Common throughout INDIA and CEYLON. DISTRIB. Temp, and trop. regions. 



Fronds 5 in. diam., dark green above, usually purplish beneath ; epidermal 

 cells with flexuous walls. Spatlie 2-lipped. Stamens 2. Ovules 1-2, semianatro- 

 pous. Kurz describes a var. concolor with much larger fronds, green on both sur- 

 faces, as occurring under trees in Bengal. 



6. L. oligrorrhiza, Kurz in Journ. Linn. Soc. ix. 267, t. 5 ; roots 

 few, fronds membranous ovate or oblong 3-5-nerved. Bentli. Fl. Austral. 

 vii. 163. Spirodela oligorrhiza, Hegelm. Lemnse, 147, t. 16. S. melanor - 

 rhiza and pleioirrhiza, F. Muell. ex, Kurz in Seem. Journ. Bot. (1867) 115. 



BENGAL, Kurz, and elsewhere in India. DISTBIB. Trop. Asia, Australia, Poly- 

 nesia. 



Fronds %-% in. long by half as broad, thin, shining, collected in circinate groups, 

 purple beneath. Roots 2-5, very long. Flowers as in L. minor. Kurz, from whom 

 the above characters are taken, says that he at first took it for an extreme form of 

 L. polyrrhiza, in company of which he always found it in Bengal ; but on discovering 

 the flowers he considered it distinct. It has the general form and size of L. 

 minor. 



2. WOIFFIA, HorJcel. 



Fronds like grains of sand, rootless, proliferous, bearing the flowers on 

 the upper surface. Spathe 0. Anthers sessile, 1-celled. Style short, stigma 

 depressed; ovule 1, erect. 



1. W. ar rhiza, Wimm. Fl. Scliles. 140; fronds subglobose. W. 

 Michelii, Schleid. Beitrag. Bot. 233. W. Delilii, Kurz in Journ. Linn. Soc. 



