UMBELLIFERAE. 267 



358. GLEHNIA. 



Low villous-tomentose herbs growing in drifting sands along 

 the seashore; leaves thickish, densely white- tomentose beneath, 

 once or twice ternate or ternate-pinnate, with ovate or roundish 

 leaflets; flowers whitish; bracts subulate; calyx- teeth small; 

 fruit globose, glabrous; carpel somewhat flattened dorsally with 

 5 equal broad and corky thickened wings; stylopodium flat; 

 oil-tubes 2-3 in the intervals, 4-6 on the commissural side. 



Glehnia littoralis (Gray) Schmidt. Herbage villous-tomentose; stems 

 very short; leaves twice-ternate and then pinnate, the leaflets rather fleshy, 

 ovate to orbicular, serrate to dentate, densely white tomentose beneath, 2-5 

 cm. long; stems shorter than the leaves; rays of the umbel 10-12; fruits 8-10 

 mm. broad, with wings 3 mm. wide. 



Common in drifting sand along the ocean coast, Oregon to Alaska; first 

 collected by Cooper at Shoalwater Bay or Willapa Harbor. 



359. HESPEROGENIA. 



Low acaulescent plants; leaves once or twice ternate; flowers 

 yellow, in umbels with a few unequal rays, with one or two 

 bractlets and no involucre; calyx-teeth obsolete; fruit glabrous, 

 nearly orbicular or short-oblong, compressed laterally, rounded at 

 base and apex; carpel with indistinct filiform ribs; stylopodium 

 none; oil- tubes 2 or 3 in the intervals. 



Hesperogenia Strickland! Coult. & Rose. Glabrous, pale green; root 

 stout; leaves all basal, ternate or biternate, long-petioled, the segments lanceo- 

 late, acutish, rather thick, 8-12 mm. long; stems 8-10 cm. high, naked, with a 

 single reduced leaf; rays 3-6, unequal; flowers yellow; fruit 2 mm. long. 



Known only from Mount Rainier, Allen, Flett. 



360. OROGENIA. 



Dwarf glabrous acaulescent plants from tuberous or fusiform 

 roots; leaves ternate with linear segments; flowers white, in a 

 subcompound umbel with a few linear bractlets and no involucre; 

 calyx- teeth minute; fruit glabrous, oblong, very slightly com- 

 pressed laterally ; carpels with filiform dorsal and intermediate ribs 

 and excessively thickened lateral ones; stylopodium flattened; oil- 

 tubes very small, 3 in the intervals, 2-4 on the commissural side. 



Orogenia linearifolia Wats. Tuber globose; scape slender, 2-12 cm. high; 

 leaves 2 or 3, ternate or biternate, glabrous, the leaflets linear, obtuse, entire, 

 2-5 cm. long; umbels 2-10-rayed; flowers white, nearly sessile; fruit 3-4 mm. 

 long. 



Willamette Valley, Oregon, to Idaho, Utah and California. 



361. SIUM. 



Perennial, growing in water or in wet places; leaflets serrate 

 or pinnatifid; involucres and involucels of numerous narrow 

 bracts; flowers white; calyx- teeth minute; stylopodium depressed; 



