AMMIACEAE. 261 



merits ovate, irregularly cuspidate-toothed and lobed; umbel 20- 

 rayed, with no involucre; bractlets few, setaceous; rays 5-7.5 cm. 

 long; pedicels about 4-7 mm. long; calyx-teeth prominent; fruit 

 oblong, glabrous, 6-7 mm. long; carpophore 2-parted; oil-tubes 3-4 

 in the intervals, 4-5 on the commissural side. ( Valaa parishii 

 C. & R.) 



Occasional in the Santa Monica and San Gabriel Mountains. 



11. APIUM L. 



Annual or perennial glabrous herbs with pinnate or 

 pinnately compound leaves and white or greenish yellow 

 flowers in compound umbels. Calyx-teeth obsolete. 

 Stylopodium depressed or short-conic. Fruit ovate or 

 broader than long, smooth or tuberculate. Carpels 

 mostly with prominent ribs, somewhat 5-angled. Oil- 

 tubes mostly solitary in the intervals, 2 on the commis- 

 sural side. Seed terete or nearly so. 



1. A. graveolens L. Glabrous; stems erect, 3-9 dm. high, several- 

 leafed; leaves pinnate, the basal and lower ones long-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 m.m, 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 con- 

 spicuously reticulate beneath; fruit oblong, 3 mm. long, constricted 

 at the commissure, the ribs apparently equal, but laterals largest in 

 section, the intervals broad; oil-tubes large. 



Frequent in marshes toward the coast. 



