Flora of the Palouse Region 129 



Leaves puberulent. L. multikida. 



Leaves glabrous. L. salmonii'i.ora. 



L. multifida Nutt. Stout, 30-90 cm. tall: leaves ternately decompound, 

 puberulent, the ultimate segments oblong-linear: umbel many-rayed; rays 

 equal: flowers yellow: fruit elliptical, smooth, 8-12 mm. long; dorsal ribs 

 very obscure; oil-tubes nearly obsolete. Common on hillsides. 



L. salmoniflora C. & R. Stems 20-40 cm. high: leaves decompound, 

 glabrous, very finely dissected, the ultimate segments filiform: umbel 4-10- 

 raved, the rays 2.5-4 cm. long: flowers yellow: fruit oblong, 10 mm. long, 

 the dorsal ribs prominent; oil-tubes large. Common on basalt cliffs along 

 Snake River. 



211. ERYNGIUM. 



Glabrous perennials: leaves often rigid, coriaceous, spinosely 

 toothed, or divided: flowers white or blue, sessile, in dense brac- 

 teate heads: sepals very prominent, rigid and persistent: stylop- 

 opium wanting; styles short or long, often rigid: fruit ovoid, flat- 

 tened laterally, covered with hyaline scales or tubercles: carpel 

 with ribs obsolete: oil-tubes mostly 5, 3 dorsal and 2 commissural: 

 seed face plane. 



£. articulatum Hook. Erect, 30-70 cm. tall: branches dichotomous, 

 usually with a peduncled head in the forks: lower leaves mostly reduced 

 to long nodose petioles sometimes bearing a lanceolate entire or spinulose- 

 serrate blade; upper leaves opposite, sessile, usually jagged near the base: 

 heads globose, blue: bracts lanceolate, spiny-toothed, exceeding the head: 

 calyx-lobes lanceolate, cuspidate, 4-5 mm. long: style shorter than the calyx- 

 lobes. Wet places, not common. 



212. OSMORRHIZA. 



Glabrous to hirsute perennials, 30-90 cm. high: roots thick, 

 aromatic: leaves ternately decompound: leaflets broad, ovate to 

 lanceolate, variously toothed; involucre and involucels few-leaved 

 or wanting: flowers white or purple, in few-rayed and few-fruited 

 umbels: calyx-teeth obsolete: stylopodium conical, sometimes de- 

 pressed: styles mostly short: fruit linear to linear-oblong, more or 

 less attenuate at base, obtuse, acute or beaked at apex, glabrous 

 or bristly on the ribs: carpels slightly flattened dorsally or not at 

 all, often tapering into a long tail-like attenuation at the base, 

 nearly pentagonal in section, with equal ribs and thin pericarp: 

 oil-tubes obsolete in the mature fruit (often numerous in young 

 fruit): seed face from slightly concave to deeply sulcate. 



Fruit bristly-hairy: carpels conspicuously attenuated at base. 



O. DIVARICATA. 



Fruit smooth: carpels obtuse at base O. occidkntai.is. 



