A REVISION OF THE INDIAN SPECIES OF ROTALA. 2ir, 



A senegaleiisis Lam. has not been noted from India before. The A. aene- 

 galensis mentioned by Clarke in the Flora of Brit. India is A. auriculata 

 WiUd. 



0. Ammannia haccifera L. Sp. PI. ed. 2 (1762) 175 ; Burm. Fl. Ind. 



(1768) 38, t. 15, f. 3,4 ; DC. Frodr. Ill ( 1828) 78; Hiern m Oliv. Fi. 



Trop. Afr. II (1871) 478 (pro parte) ; Clarke in Hook. f. Fl. Brit. Ind. 



II (1897) 569 ; Koehne in Engl. Bot. Jahrb. 1 (1880) 258, IV (1883) 



391, in. Engl. Pflanzenr. iV, 216 (1903) 53; Dalz. and Gibs. Bomb. Fl. 



(1861) 97; Kurz. in Journ. Asiat. Soc. Beng. pt. 11 (187/) 85; Cooke 



Fl. Bomb. Pres. I (19U3j 509 .—A . indica Lam. 111. 1 (1791) 311 ; Poir. 



Supp. 1 (1810) 328 ; DO. 1, c. 77 (fortassis partim tantwn) ; Benth. Fl. 



Austral. Ill (1866) 297.—^. vesicatoria Roxb. Fl. Ind. I (1820) 427 ; 



DO. L c. 78. Cryptotheca apetala Bl. Bijdr. (1826) 1129; DO. 1. c. 



67. — A. dehilis Blanco Fl. Filip. ed. 2 (1845) 46 {non kit.).— A. atte- 



nuata A. Rich Fl. Abyss. 1 (1847) 278. — Hapalocarpuni indicum Miq. et 



vedcatorium Miq. Fl. Ind. Bat. 1 (1855) 618. — A. cegyptiaca, Willd. 



Enum. Hort. Berol. I (1809) 167, t. 6 ; Delile Fl. D'Eg. (1813) 37, 



t. 15, f . 3 ; DC. I. c. 78.—^. salicifolia Hiern in Oliv. Fl . trop. Afr. 11 



(1871) 478, erd. syno. (wora Monti) ; Clarke in Hook. f. Fl. Brit. Ind. II 



(1879) 569; Dalz. and Gibs. Bomb. Fl. (1861) 97; Cooke Fl. Bomb. 



Pres. 1(1903)509. A. ylaucaVfaM. Cat. (1828) 2100; W. and A. 



Prodr. 305. A. densiflora Miq. in Herb. Hohenack. No. 770 (ex 



Clarke). 



We have united A. salicifolia as understood by Hiern and Clarke ( not 

 of Monti) with A. baicifera L., not even retaining them as subspecies 

 as was done before by Koehne. Clarke says: The only character by 

 which ^. 6acci/e/-a can be distinguished from A. salicifolia are the 

 attenuated leaves. We have examined hundreds of specimens and 

 found that this distinction does not hold good. 



Glabrous, erect or subscandent, 8-65 cm. high, often branching, 

 branches usually opposite. Leaves 7-70 mm. long, 1-16 mm. broad, 

 lower leaves usually opposite, cauline ones opf osite or alternate, 

 oblong or narrow-elliptic, narrowed at the base, or rounded, or 

 subcordate, or siibauriculate, usually obtuse or subacute. 



Dichasia (1-) 3-multi-flowered (dense axillary clusters or loose, but very 

 short cymes), sessile or subsessile. Flowers distinctly pedicelled, 

 sessile or subsessile. Calyx 1-2 mm. long ; tube hemispheric, teeth 4, 

 broad, triangular, acute, cornua minute or absent. Petals or 

 minute ; stamens as long as the lobes or slightly shorter. 



Capsule depressed, globose, 1-2 mm., in diam., covered up to ^ or :| by 

 the calyx tube, slightly or much longer than the teeth. 



Habitat : All over India, the most common species. 



Distribution. : Africa, S. and E. Asia, Australia, Europe (where it is 

 probably introduced). 



Species excludendce. 



Ammannia lanoeolata Heyne and Ammannia cordata W. and A. belong to 



the genus Nesaea which may be distinguished from Ammanrda by the 



following points : — 



{a) The dissepiments of the ovary are quite complete and conse- 

 quently, the placenta is continuous with the style. 



(6) The capsule opens by a .smn 11 operculum, the lower part reraaint- 

 and opens subseptifragally or irregularly. 



(c) There are often 2-4 large bracteoles. 



In order to facilitate the correct naming of the three species here con- 

 cerned we append their descriptions. 



