516 FLORA OF MADRAS. [Jussieua. 



Fruit a many-seeded capsule ; leaves alternate : 



Stamens twice as many as the calyx-lobes ; ovary 4-celled : 

 Calyx scarcely produced beyond the ovary ; capsule septicidal 



1. Jussieua. 

 Calyx iisually much produced beyond the ovary ; capsule loculi- 



cidal Oenothera. 



Stamens as many as the calyx-lobes ; ovary 3-6-celled 



2. Ludwigia. 



Fruit iiidehiscent, 1-4-celled, 1-4-seeded: 



Flowers 2-merous; ovary 1-2-celled, the ovules attached to the 

 axis ; small erect land herbs with small fruits having hooked 



hairs 3. Circaea. 



Flowers 4-merous ; ovary 2-celled, the ovules attached to the 

 septum ; floating water herbs with large fruits with 2-4 spines 



4. Trapa. 



1. Jussieua, Linn. 



Herbs or undershrnbs, usually of wet places. Leaves alternate, 

 usually entire. Flowers yellow or white, axillary, solitary ; 

 pedicels with 2 bract eoles. Calyx-tube narrow, scarcely produced 

 above the ovary; lobes 4-6, acute, persistent. Petals 4-6, on the 

 margin, of an epigynous disk. Stamens twice as many as the 

 petals and inserted with them. Ovary inferior, 4-5-celled ; ovules 

 many, axile, in several vertical rows at the inner angle of each 

 cell ; style simple, short ; stigma 4-5-lobed. Fruit a linear, terete 

 or angled, 4-5-celled capsule, septicidally 4-5-valved, crowned by 

 the disk and calyx-lobes. Seeds numerous, small, the crustaceous 

 testa including an empty cell forming the raphe, the embryo in 

 a membranous inner coat ; cotyledons oblong, obtuse. 



Water-plants with floating or creeping stems ; petals 5, white ; leaves 

 obovate or oblanceolate, obtuse; seeds with a narrow raphe... 1. repens 

 Erect plants of wet places ; petals 4, yellow ; leaves lanceolate, 

 acute ; seeds with a prominent raphe, appearing didymous in one 

 variety 2. suffruticosa. 



1. JUSSIEUA REPENS, % Linn. ; F. B. I. ii. 587 ; W. & A. 336. 



E. and W. Coast Districts, in or on the borders of ponds 

 and tanks and watercourses. 



A pretty water-plant, floating by means of white cellular 

 floats at the nodes of the main stem. 



2. JUSSIEUA SUFFRUTICOSA, Linn. ;*F. B. I. ii. 587. /. villosa, 

 Lamk. ; W. & A. 336. 



