C-\KROT FAMILY 631 



Oil-tubes in pairs in the lateral intervals; jjedicels and fruit hispid. 



12. A. Wheeleri. 

 Oil-tubra many, continuous around the seeds ; rays of the umbels ■widely spreading. 



1*3. A. ampla. 



1. A. Dawsoni S "^'ats. Stem 3-9 dm. high, slender, glabrous; leaves 

 twice or thrice ternate: leaflets lanceolate, 2-5 em. long, sharply and finely ser- 

 rate, yellowish green, acute or actmdnate; umbels soUtary; bracts and bract lets 

 foliaceous, oblanceolate, lacerate-toothed; flowers greenish ochroleucous; fruit 

 glabrous. 5 mm. long: stvlopodium minute. River banks and roctv- places: 

 Alta.— Mont.— Ida.— B.C." Mont. Jl-Au. 



2. A. Grayi Coult. & Rose. Stem stout, 2-6 dm. high, glabrous up to the 

 inflorescence: leaves onc-e or twice ternate, but with the middle division larger, 

 then pinnate; leaflets oblong or ovate, 2-3 cm. long, acute, serrate; bractlets 

 about 1 cm. long, longer than the pedicels: fruit oblong, glabrous. 4—5 mm. long: 

 wings prominent and rather thick. Selinum Grayi Coult. & Rose. Motmtains: 

 Colo.— « Wyo. MorU.—AIp. Jl-Au. 



3. A. genuiflexa Xutt. Stem glabrous up to the puberulent i>ediincles, 

 6-12 dm. high: leaves twice ternate, the lateral divisions often deflexed; leaflets 

 ovate or broadly lanceolate, acuminate, irregularly and sharply serrate; fruit 3-4 

 mm. long: dorsal wings low: lateral wings broader than the bodj*; stylopodium 

 conic. Wet places: Ore. — ^B.C. — ^Alaska. Submont. Jl-S. 



4. A. leporina S. Wats. Stem glabrous. 3-9 dm. high; leaves bipinnate: 

 leaflets linear to lanceolate, long-acimiinate. distantly serrate. 3-S cm. long; 

 frmt glabrotis, about 3 mm. long: wings rather prominent, the lateral ones nar- 

 rower than the body. Wet places: Utah. Son. — Submont. Jl-Au. 



5. A. pinnata S. Wats. Stem glabrous, 6-10 dm. high; leaves simply pin- 

 nate, or the lower pairs sometimes again pinnate; leaflets lanceolate, sharply 

 serrate. 3-15 cm. long: flowers yellowish or purplish; fruit oblong, glabrous, 

 4-6 mm. long: wings thick and prominent, the lateral ones scarcely as wide as 

 the bodv; stv-lopodimn shghtlv conic. Wet meadows: Alta.^X.M.^Utah. 

 Plain— Mont. Jl-Au. 



6. A. arguta Xutt. Stem glabrous up to the inflorescence, 5-10 dm. high; 

 leaves ternate and then pinnate or bipinnate; leaflets mostly small, ovate or 

 lanceolate, 2-5 cm. long, acute, sharply serrate: fniit elliptic, glabrous. 6-8 mm. 

 long: dorsal wings low and thick: lateral wings fully as broad as the body, more 

 or less corky. Wet places: Ore. — Ida. — Mont. — Wash. Submont. Jl^Au. 



7. A. Lyallii S. Wats. Stem stout, 6-15 dm. high; leaves ternate and then 

 twice pinnate; leaflets ovate to lanceolate, acute, serrate, with ovate teeth; fruit 

 oblong, glabrous, 4-6 mm. long; dorsal wings low and thick; lateral wings as 

 broad or broader than the bodv. Wet meadows: Alta. — ^Wvo. — ^Utah — Ore. — 

 B.C. Submont.— Mont. Jl-Aii. 



8. A. Piperi Rydb. Stem about 1 m. high, stout, glabrous or nearly so; 

 leaves ternate and then twice pinnate: leaflets ovate, 5-15 cm. long, coarsely 

 toothed, with rotmded-ovate teeth: rays 10-25. mostly scabrous-puberulent, 2-6 

 cm. long: bractlets 1 or 2. subtilate: fruit elliptic, 5-6 mm. long: dorsal wings low 

 and thick; lateral wings about as broad as the body. Wet wckkIs: Wash. — Ida. 

 Submont. — Mont. Je-Au. 



9. A. dilatata A. Xels. .Stem 5-15 dm. high; lower leaves ternate, then 

 pmnate: the upper simply pinnate: leaflets broadly obovate or ovate, obscurely 

 or irregularly serrate; umbels 10-30-rayed; fruit sparingh- scabrous, oblong- 

 eUiptic. 5 mm. long or less. Along streams: Utah. Jl-Au. 



10. A. Kingii (S. Wats.) Coult. & Rose. Stem glabrous up to the inflor- 

 escence. 3-6 dm. high: lower leaves bipinnate, the upper ones simply pinnate; 

 leaflets lanceolate to hnear-lanceolate. 3-7 cm. long, coarsely and unevenly ser- 

 rate: fruit broadly oval, hispid. 4—6 mm. long: wings thick and rather low: stylo- 

 pnxliimi low-conic. Wet meadows: CaUf. — Ida. — Xev. Son. Jl.-Au. 



11. A. Roseana Henderson. Stem low and stout. 3-6 dm. high, glabrous 

 up to the scabrous inflorescence; leaves twice or thrice ternate, then pinnate; 



