556 CLXVI. AROIDEJB. (J. D. Hooker.) [Pothos. 



Throughout INDIA and CEYLON, in marshes, wild or cult., ascending the Himalaya 

 to 6000 ft. in Sikkim. DISTBIB. north, temp, and warm regions. 



Sootstock very aromatic. Leaves 3-6 ft. by f-l in., margins waved. Peduncle 

 i-f in. broad. Spathe 6-30 in. long. Spadix 2-4 in. - in. diam., slightly 

 curved. Sepals about equalling the ovary. Sweet Flag. 



2. A. gramineus, Soland. in Ait. Hort. Kew, i. 474 ; midrib 0. Schott 

 Prodr. 580 ; Engler Arac. ii. 218. A Calamus, Benth. Fl. Hongk. 345. A. 

 terrestris, Spreng. Syst. ii. 118 ; Schott I. c. 579. A. Tatarinovii, Schott in 

 (Estr. Bot. Zeitschr. (1859) 101. A. Calamus var. terrestris, Engler I. c. 217. 



SIKKIM HIMALAYA, alt. 6000 ft. J.D.H. KHASIA HILLS, alt. 4-5000 ft., Griffith, 

 &c. DISTBIB. China, Japan. 



Much more variable in size than A. Calamus, from 6 in. to 3 ft., with a shorter 

 spathe and more slender spadix. 



ORDER CLXYII. LEIVXNACEJE. 



Minute or small annual floating green scale-like plants, rootless or 

 with capillary roots, propagated by budding or by hybernating bulbils, 

 rarely by seed. Flowers 1-3, naked, or in a spathe ; perianth 0. Stamens 

 1-2, anthers 1- or 2-celled. Ovary 1-celled ; style short ; stigma truncate, 

 or funnel-shaped ; ovules 1-7. Utricle bottle-shaped. Seeds 1- or more, 

 testa coriaceous ; albumen 0, or fleshy ; embryo axile, cylindric. Genera 

 2, or according to various authors 3 or 4. Species about 20, in all countries. 



1. IiEMNA, Linn. 



Fronds with one or more roots, bearing the flowers in marginal clefts. 

 Filaments slender ; anthers 2-celled. Ovules 1-7. Species 17, natives of all 

 countries. 



L. obcordata, Ham. in Wall. Cat. 5201, is a species of Riccia. 



1. Zi. minor. Linn. Sp. PI. 976 ; root solitary, frond symmetrical 

 obovoid or oblong nearly flat on both surfaces, ovule solitary. Kunth 

 Enum. iii. 4. Reichb. Ic. Fl. Germ. vii. t. 14. Hegelm. Lemnse, 141, t. 9, 

 10 ; Boiss. Fl. Orient, v. 29 ; Kurz in Journ. Linn. Soc. ix. 266. 



Throughout INDIA? WESTERN TIBET, to 9500 ft., Thomson. DISTBIB. 

 Cosmopolitan. 



Frond - in. long ; young sessile on the old, but soon detached, green above, 

 epidermal cells with flexuous walls. Root-sheath not appendaged, cap obtuse. 

 Spathe 2-lipped. Stamens 2 (each a male fl.). Style long. Seed horizontal, hemi- 

 anatropal, albuminous. Kurz (Journ. Linn. Soc. xi. 266) thinks that L. minor 

 does not occur in India proper. If this be so, L. paucicostata has been mis- 

 taken for it, a point I must leave it for local botanists to clear up. Hegelrnaier gives 

 the Caucasus and W. Tibet as the only Asiatic habitats. 



2. Zi. paucicostata, Hegelm. Lemnse, 139, t. 8 ; root solitary, frond 

 asymmetrical obovate or obovate-oblong nearly flat on both surfaces,; 

 ovule solitary. Boiss. FL Orient, v. 30. L. minor, Griff. Notul. iii. 216 ; 

 Hegelm. in Seem. Journ. Bot. (1865), 112; Thw. Enum. 331. 



In various parts of INDIA and CEYLON j ascending the Khasia Hills to 6000 ft. 

 DISTBIB. Cosmopolitan tropical. 



Distinguished from L. minor by the asymmetric fronds, appendaged root-sheath, 

 acute root-cap, and erect orthotropous seed. 



3. Zi. gibba, Linn. Sp. PI. 970; root solitary, frond orbicular or 



