706 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXV. 



Flowers 3-4-merons, axillary ; bracteoles half as long as the calyx or 

 shorter. Calyx I'o-'l mm. long, suburceolate-tubular in flower. Petals as 

 long as the lobes or slightly longer. Stamens inserted 5 inside the tube, 

 scarcely reaching the sinuses of the teeth. Style very short. 



Capsule 3-4-valved, globose-ellipsoidal. 



Habitat : Bombay Presidency : Konkan (Law) ; Halilal in Kanara (Talbot) ; 

 Madras Presidency : Ambattnr in the Chingulpet Distr., Feb. 1915 (Herb. 

 Pres. College, Madras ! ). Ceyhm (Herb. S. Kurz !). Seems to be rare. 



In the specimens from Ambattur the stems are branching near the base. 

 Stems and branches erect or ascending, rooting below, stout, flexuose, 

 reaching 20 cm. Bracteoles minute. Flowers 3-merous. Calyx-teeth 

 deltoid-acute, about \ of the length (jf the tube. Petals broadly obovate, 

 rounded or retuse, 1-nerved. Stigma rather large, trigonous. 



The Ceylon specimen has the stems erect, simple, or branched near the 

 top, up to 10 cm. high. Leaves reaching 7 mm. Flowers 3-merous. 



Distribution : India, Ceylon, Sunda Islands (after Miquel). 



4. Rotala wallichii, Koehne in Engl. Bot. Jahrb. I (1880) l-'")4, Engler's 

 Pflanzenr, iv, "iY^ (1903) 31. — Hijdrolythrum Wallichii, Hook. f. in Hook. Ic. 

 PI. xi, (3- ser I) (1885) 5, t. 1007 ; Clarke in Hook, f . Fl. Brit. Ind. II (1879) 

 572, except syn. Wdicitschiano. — Ammannia Wallichii, S. Kurz in Journ. 

 As. Soc. Beng. xlvi, 2 (1877) 84. 



A glabrous aquatic herb. Stem about 20 cm. long, emerged part about 

 7-10 cm., rooting at the base; angular, sometimes branching. Leaves 4-10- 

 nate, the submerged ones scarcely 0'5 mm. broad, bimucronulate, the em- 

 erged ones lanceolate or almost oblong, 2"5-4 mm. long, scarcely 1 mm. broad 

 obtuse or bimucronate. 



Spikes 2 em. long or longer. Flowers 4-merous ; pedicels about 0"75 mm. 

 long; bracteoles .} the length of the calyx. Calyx 1'5 mm. long, broadly 

 companulate, lobes half as long as the tube. Nectariferous scales 4, bilobed 

 or bifid, united below into a ring. Petals as long as the calyx, broadly 

 obovate-obtuse. Stamens inserted f^ down the throat. 



Style half as long as the ovary. 



Capsule globose, 2-celled. 



Habitat : Tenasserim : Tavoy (Wallich n. 9059, Heifer), Moulmein (ex 

 Clarke). 



Distribution: India, Java, (ex Clarke). 



That Hifdroliithrum, Hook, f, cannot be retained as a distinct genus seems 

 to follow from a remark made by Clarke in Hook. f. Fl. Brit. Ind. II. 571 : 

 "A genus (m~. Hydrolythrum) only separable from Ammannia by habit." 



5. Rotala ;fionbunda, 'Koehne, m^ng\. Bot. Jahrb. I (1880) 156, et in 

 Engl. Pflanzenr, iv, 216 (1903) 32. — Nimmoniajlorilnmda, Wight, in Madras 

 Journ. Science, v (1837) 312, t. 20.—Am<'letiaJioribunda, Wight, in Hook. Ic. 

 PI. new ser. v (1840) t. 826, in Ann. Sc. Nat. 2. ser. xi (184) 173, in Illustr. 

 Ind. Bot. I (1840) 206, excl. tab. ibid, cit Dalz and Gibs. Bomb. Fl. (18<il) 

 96. — A'mma7inia f.orilmnda, C. B. Clarke in Hook. f. Fl. Brit. Ind. II 

 (1879) 567. 



Erect or shortly creeping at the base. Stem 10-25 cm., subterete, often 

 much branched. Leaves alternate, narrow-oblong or linear, sessile, obtuse, 

 base obtuse or cordate-amplectent, lower ones up to 5 cm. long, 1-4 mm. 

 broad, upper ones much smaller, sometimes only 5 mm. 



Ilacemes up to 1 cm. long, mostly dense on filiform peduncles ; bracts 

 lanceolate-linear ; pedicel about 1 mm. long ; bracteoles similar to the bracts, 

 lanceolate, exceedhig half the length of the calyx. Calyx 2-2-5 mm. long, 

 campanulate ; teeth 4, acute, without cornua. Petals 4, obovate, nearly 

 twice the calyx-teeth, bright rose. In the short-styled flowers the stamens- 



