CARROT FAMILY 631 



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



12. A. Wheeleri. 

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



13. A. ampla. 



1. A. Dawsoni S. Wats. Stem 3-9 dm. high, slender, glabrous; leaves 

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

 rate, yellowish green, acute or acuminate; umbels solitary; bracts and bractlets 

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

 glabrous, 5 mm. long; stylopodium minute. River banks and rocky 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 once 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. Mountains: 

 Colo. s Wyo. Mont. Alp. Jl-Au. 



3. A. genuiflexa Nutt. Stem glabrous up to the puberulent peduncles, 

 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 body; 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-acuminate, distantly serrate, 3-8 cm. long; 

 fruit glabrous, 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 body; stylopodium slightly conic. Wet meadows: Alta. N.M. Utah. 

 Plain Mont. Jl-Au. 



6. A. arguta Nutt. 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; fruit 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 body. Wet meadows: Alta. Wyo. Utah Ore. 

 B.C. Submont. Mont. Jl-Au. 



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 rounded-ovate teeth; rays 10^25, mostly scabrous-puberulent, 2-6 

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

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

 Submont. Mont. Je-Au. 



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

 pinnate; the upper simply pinnate; leaflets broadly oboyate or ovate, obscurely 

 or irregularly serrate; umbels 10-3Q-rayed; fruit sparingly scabrous, oblong- 

 elliptic, 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 linear-lanceolate, 3-7 cm. long, coarsely and unevenly ser- 

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

 podium low-conic. Wet meadows: Calif. Ida. Nev. 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; 



