610 AMMIACEAE 



Fruit more or less constricted at the apex into a short neck. 

 Pedicels longer than the fruit. 



Stylopodium short, broad and flat, making the fruit almost truncate at the 



apex; plants almost glabrous. 



Corolla p\irple. 3. O. purpurea. 



Corolla white. 4. O. Leibergii. 

 Stylopodium as well as the neck tapering above, the fruit therefore ending in 



a short beak. 



Branches of the umbel in fruit ascending; fruit 15 mm. or more long; beak 



2 mm. or more. 5. O. intermedia. 



Branches of the umbel in fruit divaricate; fruit 12-13 mm. long; beak 



scarcely more than 1 mm. long. 6. O. divaricata. 



Pedicels shorter than the fruit. 7. O. brevipes. 



1. O. longistylis (Torr.) DC. Stem stout, glabrous or nearly so, 3-10 dm. 

 high; leaves twice to thrice ternate; ultimate leaflets 3-7 cm. long, acuminate, 

 sparingly hirsute ; involucre and involucels of few narrowly lanceolate-acuminate 

 bracts; fruit 2-3 cm. long, with a slender attenuation at the base; Stylopodium 

 elongate-conical, 1 mm. long; styles 2 mm. long. W. longistylis Britton. Damp 

 woods: N.S. Ga. Colo. Alta. Plain Submont. My-Jl. 



2. O. obtusa (Coult. & Rose) Fernald. Stem 3-6 dm. high, glabrous or 

 more or less pilose, with spreading or reflexed hairs; leaves twice or thrice ternate; 

 ultimate leaflets ovate or lanceolate, mostly acuminate; umbels with spreading 

 branches; fruit about 15 mm. long; Stylopodium flattened, 0.5 mm. long or less; 

 styles very short, recurved. W. obtusa Coult. & Rose. Woods in the mountains: 

 Alta. N.M. Calif. B.C.; Gaspe, Que. Submont. Subalp. Je-Au. 



3. O. purpurea (Coult. & Rose) Suksd. Stem 2-6 dm. high, nearly gla- 

 brous; leaves twice ternate; leaflets ovate or lanceolate, acute or ac'uminate, 2-7 

 cm. long; branches of fruiting umbels widely spreading; fruit slightly hispid at 

 the base, 10-12 mm. long, slightly beaked at the apex; styles over 0.5 mm. long. 

 W. pupurea Coult. & Rose. Woods: Alaska Mont. Ore. Mont. Je-Au. 



4. O. Leibergii (Coult. & Rose) Blankinship. Stem 3-6 dm. high, almost 

 glabrous; leaves twice or thrice ternate; leaflets thin, ovate or lanceolate, acum- 

 inate; umbels with ascending branches; fruit slightly hispid at the base; styles 

 less than 0.5 mm. long. W. Leibergii Coult. & Rose. Moist woods: Ida. 

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



5. O. intermedia (Rydb.) Blankinship. Stem 4-8 dm. high, sparingly 

 villous or glabrous; ultimate leaflets rhombic-ovate, acute, somewhat pubescent; 

 branches of umbel ascending in fruit; fruit about 15 mm. long; Stylopodium 0.5 

 mm. long; styles very short. W. intermedia Rydb. Woods and copses: Mont. 



Colo. Utah Alaska. Submont. Mont. Je-Au. 



6. O. divaricata Nutt. Stem slender, 3-6 dm. high, sparingly pubescent; 

 leaves twice or thrice ternate; ultimate leaflets 2-6 cm. long, ovate, acute or 

 acuminate, more or less pubescent; branches of the umbels very long and divari- 

 cate in fruit; fruit 12-13 mm. long; Stylopodium 0.25 mm. long; styles of about 

 the same length. W. divaricata Britton. Woods: B.C. Ore. Utah S.D.; also 

 Gaspe, Que. Submont. Mont. Je-Jl. 



7. O. brevipes (Coult. & Rose) Suksd. Stem 3-8 dm. high, pubescent, 

 with short retrorse hairs; leaflets broadly ovate, 2-5 cm. long, obtuse or acutish, 

 more or less pubescent; branches of the umbels 3-7, ascending; pedicels 4-12 mm. 

 long; fruit 14-16 mm. long, with slender attenuation at the base and a distinct 

 beak 2 mm. long; Stylopodium conic, less than 0.5 mm. long; style short. W. 

 brevistylis Coult. & Rose. Woods and thickets: B.C. Mont. Wyo. Calif. 

 Submont. Mont. My-Jl. 



6. GLYCOSMA Nutt. 



Caulescent perennials, with rootstocks, more or less pubescent, at least at 

 the nodes. Leaves ternately decompound, with lanceolate, toothed leaflets. 

 Flowers yellow, in few-leaved umbels. Calyx-teeth obsolete. Stylopodium 

 conic or depressed. Fruit linear-clavate, glabrous, obtuse at the base; oil-tubes 

 obsolete in the fruit; seed-face concave or grooved. 



Fruit 12-16 mm., rarely 18 mm. long, on erect pedicels. 1. G. occidentalis. 



Fruit 20 mm. long or more, on spreading pedicels. 2. G. maxima. 



