618 AMMIACEAE 



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. Submont. 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. Plain Submont. Je-S. 



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

 ternate; leaflets linear, 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 Coult. & 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 purple. Bracts mostly wanting; bractlets small, 

 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. 

 Involucres wanting. 

 Corolla yellow. 



Rachis 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 purple. 5. A. planosum. 



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

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

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

 wings 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 

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

 lands: Utah Colo. Wyo. Ida. Son. Submont. Ap-My. 



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

 line, thrice pinnatifid, glaucous; ultimate divisions small, obovate or oblong, 

 acute; bractlets subulate; fruit 6-7 mm. long; wings very narrow. River valleys: 

 Colo. Submont. Je. 



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; wings 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 

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

 bractlets few, subulate; fruit oblong, 6 mm. long, broadly winged. Dry places: 

 Colo. Submont. Je. 



