234 



Peduncles stout, spreading, 2-5 mm. long. 



2. C. marginata. 

 Peduncles deflexed, 2-5 mm. long, fruit rooting in the 

 mud. 



Leaves spatulate, three-nerved. 3. C. Nuttallii. 



. Leaves linear, one- nerved. 4. C. sepiilta. 



Enclosed in a perigonium. Peduncles very long. 



5. C. longipedmictilata. 

 Fruit sessile. 



With a perigonium. 



Fruit oblong, narrowly winged on the apical margin, flat 

 on the face, styles shorter than the fruit and decid- 

 uous. 6. C. verna. 

 Fruit obovate, wings nearly wanting, plano-convex on 

 the face. Styles longer than the fruit, persistent. 



7. C. heterophylla. 



Fruit with broad membranous wings which run around 

 the entire margin. Styles elongated, deciduous. 



8. C. stenocarpa. 



Fruit orbicular, margins obtuse. Styles elongated, mostly 

 deciduous. 9. C. Bolanderi. 



Without a perigonium. 



Leaves all submerged and linear. 10. C. autumnalis. 

 Leaves all spatulate. Fruit curiously gibbous at the base. 



II. C. peploidcs. 



I. C. deflexa. Braun, var. Austini. Hegelm. Verhandl. Bot. 



Brand, p. 17 (1867). 



C. Austini. Englm. Gr. Man. Ed. 5, 428 (1867). 



Terrestrial, 2-4 cm. high, growing on damp soil in shady 

 woods. Leaves spatulate or obovate, three- nerved, 3-4 mm. 

 long and nearly or quite 2 mm. broad, tapering at base into a 

 short margined petiole. Fruit about ,^ mm. long by j^ mm. 

 broad, deeply notched at both ends ; lobes with a narrow mar- 

 ginal wing or raised border and a deep groove between them ; 

 usually with a minute peduncle nearly or quite their own length. 

 Styles persistent, shorter than the fruit, spreading or reflexed. 

 The dried plant exhales a pleasant odor like that of Melilotiis. 



