UMBELLIFERAE. 265 



Carum oreganum Wats. Very similar to C. gairdneri but the lower leaves 

 more divided, and with shorter linear lobes; involucels broader and more 

 scarious; fruit oblong, 3-4 mm. long. 



Willamette Valley, Oregon, south to northern California. First found 

 by Nuttall on Wappatoo or Sauvies Island; doubtfully distinct from C. 

 gairdneri. 



353. ZIZIA. 



Smooth perennials with simple to ternately compound leaves; 

 involucre none; involucels of small bractlets; flowers yellow; 

 calyx- teeth prominent; stylopodium wanting; styles long; fruit 

 compressed laterally, ovate to oblong, glabrous ; central fruit of 

 each umbellet sessile; carpel with filiform ribs; oil-tubes large and 

 solitary in the broad intervals, 2 on the commissural side and a 

 small one in each rib; seed terete, longitudinally grooved beneath 

 the oil-tubes. 



Zizia cordata (Walt.) Koch. Glabrous, 30-80 cm. tall; lower leaves 



simple, cordate, crenately toothed, 2-8 cm. long, sometimes lobed or even 



ternate, mostly long-petioled; upper leaves short-petioled, palmately com- 

 pound, of 3-5 leaflets, ovate or lanceolate, incised and serrate; fruit ovate, 3 

 mm. long. 



Said to occur in the Willamette Valley; abundant east of the Cascade 

 Mountains. 



354. OENANTHE. 



Aquatic glabrous herbs with succulent stems; leaves pinnate 

 or decompound ; flowers white, in involucrate umbels ; calyx- teeth 

 rather prominent; fruit glabrous, globose or but slightly laterally 

 compressed; carpel with broad obtuse corky ribs; stylopodium 

 very short, conical; styles elongated; oil-tubes solitary in the 

 intervals, 2 on the commissural side. 



Oenanthe sarmentosa Presl. Glabrous; stems weak, decumbent, somewhat 

 succulent, 30-60 cm. long; leaves ternate, then bipinnate, the leaflets ovate, 

 acuminate, coarsely serrate, sometimes lobed at base, 1-2.5 cm. long; umbels 

 3-5 cm. broad; involucral bracts few, linear; fruit oblong-cylindrical, 4 mm. 

 long. 



Very common in wet places; first found at Nootka Sound by Haenke. 

 Sometimes called Water Parsley. 



355. LILAEOPSIS. 



Small glabrous perennials, creeping and rooting in the mud; 

 leaves reduced to hollow cylindrical or awl-shaped jointed pet- 

 ioles; flowers white, in few-flowered umbels which are subtended 

 by minute bracts; calyx- teeth small; fruit glabrous, globose 

 or but slightly compressed laterally; carpel with filiform dorsal 

 and intermediate ribs, the lateral ribs thick and corky next to the 

 commissure; stylopodium flat; oil-tubes solitary in the intervals, 

 2 on the commissural side. 



