152 . UMBELLIFER^E. 



2. C. Californica, Gray. Eoolstock horizontal, freely branching, the 

 branches % 1 ft- lng> the older portion slender (% in. thick or more) 

 with long internodes. upper end abruptly davate-enlarged and short-jointed: 

 stem erect, 36 ft. high: lowest leaves bipinnate, the upper simply pin- 

 nate; leaflets ovate-lanceolate : involucre nearly obsolete: seed sometimes 

 with 2 oil-tubes in the intervals. In eddies and along the margins of 

 swift-flowing mountain streams of the Coast Kange only, from near 

 Santa Cruz and Mt. Hamilton to the Oakland Hills. 



9. (ENANTHE, Diosc. Aquatic perennials, with glabrous decom- 

 pound leaves and involucrate umbels. Calyx-teeth prominent, acute. 

 Stylo podium short-conical: styles elongated in age. Fruit oblong, not 

 compressed, with broad commissure, rounded corky ribs, and oil-tubes 

 solitary in the intervals. Seed compressed dorsally, flat on the face. 



1. (E. Californica (H. & A.), Wats. Eootstocks erect or ascending, 

 1 2 in. long, % in. thick, solid : stem solitary, decumbent or procumbent, 

 rooting at the lower joints, erect above and with one or more umbellif- 

 erous branches : leaves ternate and bipinnate (or the upper ones simply 

 pinnate), the pinnae nearly sessile : leaflets approximate, ovate, acutish, 

 toothed, at base often lobed, 3^1 m. long: fr. 1% lines long, oblong, 

 obtuse at each end, tipped with the long spreading styles; ribs and 

 commissure corky: oil-tubes at the angles. Very common, forming 

 dense masses covering shallow pools, back of the salt marshes and 

 among the hills. April Nov. 



10. APIUM, Brunfeh. Glabrous biennial, with pinnately or ternately 

 compound leaves, and nearly naked umbels of small whitish flowers. 

 Calyx-teeth obsolete. Stylopodium depressed or 0. Fruit ovate or 

 broader; the carpels straight, obtusely ribbed; oil-tubes solitary in the 

 intervals. Seed nearly terete. 



1. A. GRAVEOLENS, L. (CELERY). Biennial, with fibrous roots: stem 

 erect, 2 3 ft. high, branching freely: leaves pinnate; leaflets in 1 or 2 

 pairs, cuneate-obovate or rhomboidal, sparingly toothed, 1-^2 in. long, 

 those of the uppermost leaves 3 only, oblanceolate, nearly entire : umbels 

 sessile or short-peduncled; rays 6 12, slender, 1 in. long: fr. % line 

 long. Common in marshy grounds throughout the Bay region. 



11. APIASTRUM, Nutt. A small and rather delicate branching 

 annual, with leaves dissected into linear segments. Umbels sessile in 

 the forks, or opposite the leaves, naked, few-rayed. Calyx-teeth obsolete. 

 Petals ovate, concave, obtuse. Stylopodium depressed; styles short. 

 Fruit cordate, laterally compressed, the commissure narrow; ripe carpels 

 incurved, with 5 often obscure rugulose ribs; oil-tubes broad and solitary 

 in the intervals, with a narrow one under each rib. 



1. A. augustifolium, Nutt. A few inches to nearly a foot high; 

 branches more or less dichotomous : leaves 1 2 in. long, biternately or 



