AMMIACEAE. 263 



the truly pinnate, with 2 pairs of broadly lanceolate, acute, serrate 

 leaflets; bracts broadly lanceolate, tapering at both ends; fruit 3 mm. 

 long, strongly ribbed. 



Near Pasadena, Davidson. 



15. BERULA Hoffm. 



Smooth aquatic perennial herbs with simple pinnate 

 leaves, variously cut leaflets, and small white flowers. 

 Calyx-teeth minute. Fruit flattened laterally, nearly 

 round, emarginate at base, glabrous. Carpel nearly 

 globose, with very slender inconspicuous ribs, thick 

 corky pericarp and no strengthening cells. Stylopodium 

 conic. Oil-tubes numerous and contiguous, closely sur- 

 rounding the seed-cavity. Seed terete. 



1. B. erecta (Huds.) Coville. Erect, 1.5-9 dm. high; leaflets 

 5-9 pairs, linear to oblong or ovate; serrate to cut-toothed, often 

 laciniate-lobed, sometimes crenate, 1-7.5 cm. long; umbels many- 

 rayed; rays 5 cm. long or less; bracts usually conspicuous; bractlets 

 narrow; pedicels 4-6 mm. long; fruit scarcely 2 mm. long. 



Occasional along watercourses. 



16. OENANTHE L. 



Mostly aquatic glabrous herbs with succulent stems, 

 pinnate or decompound leaves, and usually involucrate 

 umbels of white flowers. Calyx-teeth rather prominent. 

 Fruit globose, slightly flattened laterally if at all, gla- 

 brous. Carpel semiterete in section, with broad obtuse 

 corky ribs; laterals the largest; a band of strengthening 

 cells investing the seeds and oil-tubes. Stylopodium very 

 short-conic, with elongated styles. Oil-tubes solitary in 

 the intervals, 2 on the commissural side. Seed sulcate 

 beneath each oil-tube. 



1. O. sarmentosa californica (Wats.) C. & R. Succulent stems, 

 6-15 dm. high; leaves ternate and biternate; leaflets approximate, 

 acute or acutish, toothed, often lobed at base, 1-2.5 cm. long; 

 umbels many; bracts few, linear or none; bractlets similar, more 

 numerous; rays 2.5 cm. long or less; pedicels numerous, short; fruit 

 about 4 mm. long, with commissural face as well as ribs very corky. 



Frequent along slow-running streams. 



17. FOENICULUM Adans. Fennel. 



Erect biennial or perennial glabrous herbs, with pin- 

 nate compound leaves, linear or capillary leaflets, and 

 compound umbels of yellow flowers. Involucre and in- 



