268 UMBELLIFERAE. 



styles short; fruit compressed laterally, ovate to oblong, glabrous; 

 carpels with prominent corky nearly equal ribs; oil-tubes 1-3 

 in the intervals, never solitary in all the intervals, 2-7 on the 

 commissural side; seed subangular, with plane commissural face. 



Sium suave Walt. (S. cicutaefolium Schrank.) Stout, 60-80 cm. tall; 

 leaves pinnate, with 7-17 linear or lanceolate serrate acuminate leaflets, these 

 S— 12 cm. long; umbel many-rayed, the rays 2.5-4 cm. long; fruit 3 mm. long, 

 with prominent ribs. 



Margins of lakes and ponds, common. When growing in water the leaflets 

 are finely dissected. 



362. COELOPLEURUM. 



Stout glabrous seacoast perennial herbs ; leaves 2-3-ternate on 

 very large inflated petioles; flowers greenish-white, in many-rayed 

 umbels with a few-leaved deciduous involucre and numerous 

 small linear-lanceolate involucels; calyx-teeth obsolete; fruit 

 oblong, slightly flattened laternally if at all, glabrous; carpels 

 with very thick and prominent corky ribs which become hollow, 

 all equal or the lateral ones broadest; oil tubes small, 2-4 on the 

 commissural side and 1 or 2 under each rib. 



Leaflets acute or acuminate, not thick. C. longipes. 



Leaflets obtuse, very thick. C. maritimum. 



Coelopleurum longipes Coult. & Rose. Glabrous below the inflorescence; 

 stems stout, 1-1.5 m. high, loosely branched above; leaflets ovate, acute to 

 acuminate, cuneate at base, mostly sharply serrate, 3-5 cm. long; inflorescence 

 puberulent; umbel large, flat-topped, 10-15 cm. broad; fruit oblong, 3 mm. 

 broad, 4-6 mm. long. 



Along the seacoast of Washington and British Columbia. Scarcely dis- 

 tinct from the Alaska C. gmelini (DC.) Ledeb. 



Coelopleurum maritimum Coult. & Rose. Very similar to C. longipes; 

 leaflets broadly ovate, often subcordate, obtuse, 6-7 cm. long; fruit 6-7 cm. 

 long. 



On ocean bluffs near the mouth of the Columbia River; Ilwaco, Washington, 

 Henderson, Piper; Astoria, Oregon, Cooper. 



Family 73. CORNACEAE. Dogwood Family. 



Trees or shrubs, rarely herbs; leaves simple, alternate or op- 

 posite; flowers regular, perfect, polygamous or dioecious, in 

 cymes or heads; calyx- tube adherent to the ovary; petals and 

 stamens 4, on the margin of an epigynous disk in the perfect 

 flowers; style 1; ovary 1-2-celled, with one ovule in each cell; 

 fruit a 1-2-seeded drupe. 



Flowers perfect, in loose or head-like cymes. 363. Cornus, 269. 



Flowers dioecious, in spikes. 364. Garrya, 269. 



