152 UMBELLIFER^. 



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

 branches }& — 1 ft. long, the older portion slender {% in. thick or more) 

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

 stem erect, 3 — 6 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 Kahge 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. Bootstocks 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 pinnse nearly sessile: leaflets approximate, ovate, acutish, 

 toothed, at base often lobed, J^ — 1 in. 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 

 amoDg the hills. April — Nov. 



10. APIUM, Brunfels. 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. gkaveoijens, L. (Ceieby). 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, Null. 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. a u gust i folium, Nutt. A few inches to nearly a foot high; 

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



