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



absent. Flowers 3-6-merous, actinomorphic, sometimes dimorphic. 

 Calyx semiglobose, campantilate, urceolate -tubular, scarious-corol- 

 line or very rarely herbaceous, 3-6-lobed, cornua (appendages) 

 present or absent, base of calyx often provided with a nectarifer- 

 ous ring. Petals persistent or more rarely caducous or absent. 

 Stamens 1-6, episepalous. Ovary sessile or substipitate, incom- 

 pletel}?^ 2-4-locular ; ovules few or many and minute ; style present 

 or absent. — Capsule septicidally 2-4-valved, cartilaginous, the walls 

 microscopically horizontally striate. Seeds very small. 



Key to the Indian Species. 



A, — Petals absent. 



a. Bracteoles minute, scarious . . . . . . I. R. mexicana, 



b. Bracteoles 2-or more times longer than calyx, 



herbaceous . . . . . . . . . . '1. R. occultiflora. 



B. — Petals present. 



a. Leaves alternate . . . . . . . . h, R, floribunda. 



b. Leaves verticillate. 



(«) Flowers spikate, flowering calyx campa- 



nulate . . . . . . . . . . i. R. Wallichii. 



(b) Flowers not spikate, fl. calyx suburceolate- 

 tubular 



c. Leaves decussate. 



{a) Macroscopic stipules present (as long as 



calyx) 

 {b) No macroscopic stipules. 



I Petals deeply fimbriate . . 

 • II Petals entire or minutely erose-dentate. 



1. Calyx almost truncate (capsule 4- 

 valved) . . 



2. Calyx distinctly lobed. 

 * Bracts absent, stamen 1 . . 

 ■'■■*Bract8 2, stamens ,2-6. 



t Stem with broad interrupted 



wings . . . . . . . . 12. ii. cordata. 



tfStem with narrow or continuous 

 wings. 



§ Bracteoles herbaceous, calyx 

 suburceolate-tubular . . . . 15 i?. tenuis. 



§§ Bracteoles scarious, calyx 

 broadly campanulate. 

 ACapsules always 2-valved, no 



cornua . . . . \'i R. indica. 



A ACapsules normally not 2- 

 valved. 

 O Flowers spicate . . 14 R. rotimdifolia. 



OOFlowers not spicate. 

 LD Capsules 3-4-valved on 



the same plant . . 8 -R. Fysonii. 



□ Capsules 3-valved, 



very rarely 2-valved . . 7 R. pentandra. 



Rotala mp.iicana, Cham & Schlecht in Linnaea, v (1830) 567 ; Koehne 

 in Fl. Brasil. xiii, 2 (1877) 195, t. 39, fig. II, a. b, in Engl. Pflanzenr. iv, 

 216 (1903) 29. — Amynannia pyymaea, S. Kurz in Seem. Journ. Botany, v 



