618 AM MI ACE AE 



_>■ 



1-2 dm. long, coarsely serrate; upper stem-leaves 3-foliolate or simple, with 

 linear-lanceolate leaflets, 2-3 cm. long; involucre none, or of 1-3 scarious-margined 

 linear bracts; bractlets lance-linear; fruit laterally compressed, 3 mm. long. 

 Near brooks in volcanic soil: Ida, Son, Jl. 



2. C. vagans Greene. Stem stout, 5-15 dm. high; leaves twice or thrice 

 pinnate; leaflets thin, lanceolate or linear-lanceolate, 3-7.5 cm. long, remotely 

 serrate, not strongly reticulate; fruit orbicular, 2-3 mm. long; ribs broad; inter- 

 vals narrow; oil-tubes small. Swamps, lakes, and wet meadows: B.C. — Mont. 

 — Ida. — Calif, Son, — Siibmont, Jl-Au. 



3. C. occidentalis Greene. Stem stout, 1-2 m. high; leaves twice pinnate; 

 leaflets lanceolate or linear-lanceolate, 5-8 cm. long, sharply serrate; fruit ellip- 

 soid, 3 mm. long, constricted at the commissure; oil-tubes large. (?) C. sub- 

 falcata Greene. Swamps and wet meadows: Alta. — S.D. — N.M. — Calif.— 

 B.C. Plam—Submont, Je-S. 



4. C. bulbifera L. Stem slender, 3-9 dm. high; leaves twice or thrice 

 ternate; leaflets Hnear, sparsely toothed, 2-5 cm. long; fruit rather rare, orbicu- 

 lar, 2 mm. long, constricted at the commissure; ribs broad and low; intervals 

 narrow. Swamps: Me. — Md. — Ore. — B.C. Plain. Jl-S- 



24. AULOSPERMUM Coidt. & Rose. 



Perennial herbs, with deep-seated fleshy root. Stem partly subterranean, 

 covered at the base by scarious sheath and bearing at the end a cluster of leaves 

 and naked scapes. Leaves pinnately dissected, fleshy, with obtuse segments. 

 Flowers yellow or white or piu-ple. Bracts mostly wanting; bractlets smaU, 

 narrow, ^ Calyx-teeth evident. Stylopodium wanting. Fruit oblong in out- 

 line. Ribs or most of them with thin broad wings; intervals broad. Oil-tubes 

 several in each interval and on the commissural side. Seeds not dorsally flat- 

 tened; face with a narrow and deep groove. 



Involucres present. 1. A, glaucum. 

 lu vol acres wanting. 

 Corolla yellow. 



Kachis of the primary leaf-segments dilated; secondary segments confluent, 



broad, toothed or merely cleft. 2. A. longipes. 



Rachis of the primary leaf-segments not dilated; secondary segments distinct, 



finely dissected into oblong lobes. 3. A, angustum. 

 Corolla not yellow. 



Corolla white. 4. A. ibapense. 



Corolla piu-ple. 5. A. planosum. 



1. A. glaucum (Nutt.) Coult. & Rose. Leaves twice or thrice pinnatifid, 



glaucous; segments crowded, obovate, toothed; bracts and bractlets linear-sub- 



xilate; flowers white or ochroleucous (at least in age); fruit about 6 mm. long; 



wmgs narrow. Cymopterus glaucus Nutt. Dry places: Mont. — Ida. Plain. 

 Je. 



2. A. longipes (S. Wats.) Coult. & Rose. Naked portion of stem 5-15 cm. 

 long; leaves glaucous, pinnate or bipinnate, the ultimate divisions oval or obo- 

 vate, mucronate; fruiting peduncles 1-2.5 dm. long; bractlets subulate; fruit 

 6-8 mm. long; wings broad and thin. C. longipes S. Wats. Dry hills and bench- 

 lands: Utah— Colo.— Wyo.— Ida. Son,—SubmonL Ap-My. 



3. A. angustum Osterhout. Stem about 1 dm. long; leaves ovate in out- 



line 



acute; bractlets subulate; fruit 6-7 

 Colo. Submont. Je. 



River valleys : 



4. A. ibapense (M. E. Jones) Coult. & Rose. Leaves tripinnate, glaucous, 

 the ultimate divisions crowded, oblong, obtuse; bractlets linear, acute; fruit 4-5 

 mm long; wmgs broad and somewhat thickened at the insertion. C. ibapense 

 M. E. Jones, Dry places: Utah— Nev. Son. My-Je. 



5. A, planosum Osterhout. Stem 5-7 cm. long; leaves glaucous, ovate in 

 outhne, 7-8 cm. long, tripinnatifid, with small oblong or obovate divisions; 



. , fruit 

 Colo. Submont. Je. 



Dry places 



