622 AMMIACEAE 



Bractlets linear or lanceolate, acute; fruit oval, 6-8 mm. broad; wings moder- 

 ately thickened. 3. C. lucidus. 

 Involucels of broad membranous, more or less 3-cleft bractlets; fruit fully 10 mm. 



long, broadly elliptic. 4. C. Leibergii. 



Umbels open; petals yellow; involucre present, although often a mere vestige. 



Divisions of the leaves narrow. 5. C. Fendleri. 



Divisions of the leaves broad. 6. C. Newberryi. 



1. C. acaulis (Pursh) Rydb. Stem above ground less than 1 dm. high; 

 leaves clustered, bipinnatifid; segments entire or few-toothed; peduncles shorter 

 than the leaves; bractlets linear, entire, more or less united, foliose; fruit 6-8 

 mm. long; wings of the fruit broad, moderately thick throughout. Dry arid 

 places: Sask. Kans. Colo. Alta. Plain Submont. Ap-Je. 



2. C. Parryi (Coult. & Rose) M. E. Jones. Leaves bipinnatifid, with oblong 

 or oval obtuse segments; branches oblong or lanceolate, obtuse, united below; 

 fruit 8-10 mm. long, with broad thick wings. Coloptera Parryi Coult. & Rose. 

 Hills: Mont. Colo. Plain Submont. My-Je. 



3. C. lucidus Osterhout. Leaves narrowly ovate in outline, bipinnate, 

 glabrous, jwith ovate ultimate divisions; flowers in close head-like umbels; bract- 

 lets united at the base; wings of fruit 3 or 4, moderately thickened in the outer 

 portion. Dry plains: Colo. Plain. Ap-Je. 



4. C. Leibergii Coult. & Rose. Leaves tripinnate, with short obtuse seg- 

 ments; peduncles as long or longer than the leaves; fruit broadly elliptic, 10 mm. 

 long. Dry places: Ore. Ida. Je. 



5. C. Fendleri A. Gray. Leaves twice or thrice pinnate, with obovate 

 lobed divisions; involucre of a short sheath toothed or sometimes with linear 

 lobes; bractlets united at the base, exceeding the flowers; fruit 8-10 mm. long; 

 wings thin at the margin and at the insertion. C. decipiens M. E. Jones. Grav- 

 elly hills: N.M. Colo. Utah. Son. My. 



6. C. Newberryi (S. Wats.) Jones. Leaves shorter than the peduncles, 

 pinnately 3-5-foliolate; leaflets obovate, cleft into broad obovate lobes; bract- 

 lets conspicuous, oblong to obovate, foliaceous; fruit sessile or nearly so, 6-8 

 mm. long; lateral wings broad and thick; dorsal ribs narrowly winged or some 

 filiform. Sandy places: Utah Colo. N.M. Son. My-Je. 



30. PSEUDOCYMOPTERUS Coult. & Rose. 



Perennial herbs, with taproots and leafy stems (in two species very short). 

 Leaves bipinnate, with narrow, but not filiform, soft divisions. Flowers yellow 

 or purplish, in small umbels. Bracts usually wanting; bractlets present and 

 linear. Calyx- teeth evident but minute. Stylopodium wanting. Fruit oval, 

 flattened dorsally, glabrous. Dorsal and intermediate ribs prominent and acute, 

 or some of them usually more or less winged; the lateral ones with wings which 

 are distinct from those of the other carpel. Seed-face plane. 



Petals light yellow ; bractlets linear-subulate, longer than the flowers. 

 Plant over 1 dm. high, with distinct leafy stems. 



Ultimate divisions of the leaves short, ovate or lanceolate; leaves ovate in outline. 



1. P. montanus. 

 Ultimate divisions of the leaves linear, elongate. 



Leaves, at least the basal ones, ovate in outline. 2. P. sylvaticus. 



Leaves, at least the basal ones, broadly rhombic in outline. 



Plant slender; leaves mostly twice compound, with very long and few 



divisions. 3. P. tenuifolius. 



Plant low; leaves thrice pinnate with shorter, more numerous divisions. 



4. P. multifidus. 



Plant less than 1 dm. high, nearly acaulescent. 5. P. Tidestromii. 



Petals purple, or orange tinged with purple; bractlets linear-lanceolate or lanceolate, 



shorter than the flowers. 



Stem 2-3 dm. high; ultimate leaf-segments narrowly linear. 6. P. versicolor. 



Stem 0.5-1.5 dm. high, nearly leafless; ultimate divisions of the leaves short, oblong 

 or lanceolate. 7. P. purpureus. 



1. P. montanus (A. Gray) Coult. & Rose. Stem 3-6 dm. high, few-leaved; 

 leaves pinnate; leaflets deeply divided into short ovate or lanceolate divisions; 

 fruit 4-5 mm. long; lateral wings nearly as broad as the body; dorsal ribs with 



