236 



I mm. broad, with very narrowly winged, divergent lobes, deeply 

 emarginate at both ends, usually somewhat smaller than in the 

 preceding species. 



Oregon. Coll. E. Hall (No. 459) 1871. 



5. C. longipedunculata, n. sp. 



With thread-like stems ; leaves all spatulate or oblanceolate, 

 3-8 mm. long, the blades 1-2 mm. broad, rounded at the apex 

 and sloping into narrowly margined petioles often longer than 

 themselves, dotted with stellate scales, three-nerved, the lateral 

 nerves running into each other very near the apical margin. 

 Perigonial sacs longer than the fruit. Styles much longer than 

 the fruit, erect, deciduous. Peduncles lengthening to 10-25 

 cm. at maturity, and frequently two or three proceeding from the 

 same axil, or a little below it. Fruit thick, nearly orbicular ^-i 

 mm. long by about X mm. in breadth, minutely emarginate, the 

 lobes divergent, with a deep intervening groove, obtusely 

 margined, and with or without a very narrow wing. Nearly 

 allied to a species in the Torrey Herbarium from Constantinople 

 labelled "6". muscoides, Goldbach," which has peduncles nearly 

 as long, but with different leaves and fruit. A well marked 

 species, collected in 1884 by C. R. Orcutt, on mesas, San Diego, 

 California. 



6. C. verna. L. Fl. Suec. ed. 2, 2 (1755.) 



C. vernalis. Koch. Syn. ed. i, 245 (1837) "ot Kiitz. 



Chiefly aquatic, and quite variable. Leaves of two kinds, the 

 submerged narrow, linear, one-nerved, retuse or bifid, 10-20 mm. 

 long, gradually changing into the emersed, which are three- 

 nerved, 8-12 mm. long, the blade 3-4 mm. broad, spatulate or 

 obovate, rounded and truncate or retuse at the apex, nar- 

 rowing into a margined petiole, and profusely dotted with stellate 

 scales. South American forms figured by Hegelm. have rhom- 

 boid-spatulate leaves. A terrestrial form, growing in places from 

 which the water has receded, much smaller and more compact, 

 has tri-nerved, obovate leaves 3-4 mm. long, and 1-2 mm. broad. 

 There is also an entirely submerged form with the leaves all 

 linear. 



Styles chiefly shorter than the fruit, spreading, deciduous. 

 The typical fruit of this species is oblong in shape, i-i^4 "im. 



