Carrot Family 285 



petioled, the upper short-petioled or nearly sessile, thin, broadly 

 ovate to oval, coarsely toothed and often incised, 1-3 cm. long; 

 umbels opposite the leaves and terminal, 3-7-rayed; involucre 

 and involucels small or none ; flowers minute, white, very short- 

 pedicelled; fruit oval, scarcely 1 mm. long, the ribs somewhat 

 winged. 



Common in low marshy places. 



12. CICUTA L. WATER-HEMLOCK. 



Smooth poisonous marsh perennials with pinnately 

 compound leaves and serrate leaflets and white flowers. 

 Calyx-teeth rather prominent. Fruit flattened laterally, 

 oblong to orbicular, glabrous. Carpel with strong flat- 

 tish corky ribs, the lateral ribs largest without strength- 

 ening cells. Stylopodium low, sometimes low-conic. 

 Oil-tubes solitary in the intervals, 2 on the commissural 

 side. Seed nearly terete or somewhat dorsally flattened, 

 with face plane to slightly concave. 



1. C. occidentalis Greene. Stout, 9-18 dm. high; rootstock 

 short, giving rise to slender roots above and a fascicle of thick 

 and elongated ones below; leaves twice pinnate; leaflets from 

 linear-lanceolate to lanceolate, 5-8 cm. long, sharply serrate and 

 conspicuously reticulate beneath ; fruit oblong, 3 mm. long, con- 

 stricted at the commissure, the ribs apparently equal, but laterals 

 largest in section, the intervals broad; oil-tubes large. 



Frequent in marshes toward the coast. 



13. CABUM L. 



Smooth erect slender herbs with tuberous or fusiform 

 fascicled roots, pinnate leaves with few linear leaflets, 

 and white flowers. Calyx-teeth prominent for the size 

 of the fruit. Fruit flattened laterally, orbicular to 

 oblong, glabrous. Carpel with filiform or inconspicuous 

 ribs. Stylopodium conic. Oil-tubes large and solitary 

 in the intervals, 2-6 on the commissural side. Seed 

 dorsally flattened, more or less sulcate beneath the 

 tubes, the face plane or slightly concave. 



