UMBELLIFERAE. l8l 



Cogswellia artetnisiarum (Piper) Coult. & Rose. Very similar to C.macro- 

 carpa in all respects but the herbage finely and densely puberulent and the plant 

 usually smaller. Common in sandy soil amongst sagebrush. Hunt's Junction, 

 Leckenby. 



Cogswellia ambigua (Nutt.) Coult. & Rose. Glabrous, 10-60 cm. tall, the 

 stems usually leafy; roots globose or more commonly elongate; leaves once 

 or twice pinnately compound, the ultimate segments linear, 1-5 cm. long; 

 umbels unequally 8-18-rayed; flowers yellow; fruit linear, narrow, 6-8 mm. 

 long, on pedicels about as long. Stony soil, common. 



Cogswellia grayi Coult. & Rose. Glabrous and somewhat glaucous, the 

 peduncles 8-40 cm. high; leaves decompound, the ultimate segments very 

 numerous, short, filiform; umbel 6-16-rayed; flowers yellow; fruit oblong, 

 8-16 mm. long, glabrous. Common in springy gravelly places. The whole 

 plant is very ill-smelling. 



Cogswellia tritemata (Pursh) Jones. Peduncles 30-70 cm. tall; leaves 

 bipinnate or triternate, puberulent; leaflets linear-lanceolate, 5-15 cm. long; 

 umbel unequally 5-18-rayed, the rays 1-5 cm. long; fruit oblong, glabrous, 

 6-12 mm. long; oil-tubes large, solitary between the ribs; two on the inner side. 

 Low meadows, common. 



259. LEPTOTAENIA. 



Usually tall or stout, glabrous, nearly acaulescent; roots thick, 

 fusiform, often very large; leaves usually large, pinnately de- 

 compound; involucre of few bracts or none; involucels of numer- 

 ous small bractlets; flowers yellow or purple; calyx-teeth obso- 

 lete or sometimes evident; stylopodium wanting; fruit flattened 

 dorsally, oblong-elliptical, glabrous; carpel with dorsal and inter- 

 mediate ribs filiform or obscure; lateral wings very thick and 

 corky; commissural face with a prominent central longitudinal 

 ridge left after separation from the carpophore; oil-tubes 3-6 

 in the intervals, 4-6 on the commissural side, mostly small, some- 

 times obsolete ; seeds very flat, with plane or slightly concave face. 



Fruit narrowly oblong; foliage glabrous. L. salmoniflora. 

 Fruit elliptical or oval; foliage puberulent. 



Pedicels about as long as the fruit. L. muUifida. 



Pedicels much shorter than the fruit. L. foliosa. 



Leptotaenia salmoniflora Coult. & Rose. Stems 20-40 cm. high; leaves 

 decompound, glabrous, very finely dissected, the ultimate segments filiform; 

 umbel 4-10-rayed, the rays 2.5-4 cm. long; flowers yellow; fruit oblong, 10 

 mm. long, the dorsal ribs prominent; oil-tubes large. Common on basalt 

 cliffs along Snake River. 



Leptotaenia multiflda Nutt. Stout, 30-90 cm. tall; leaves ternately de- 

 compound, puberulent, the ultimate segments oblong-linear; umbel many- 

 rayed; rays equal; flowers yellow; fruit elliptical, smooth, 8-12 mm. long; 

 dorsal ribs very obscure; oil-tubes nearly obsolete. Common on hillsides. 



Leptotaenia foliosa (Hook.) Coult. & Rose. Stout, 40-60 cm. high; 

 leaves 2- or 3-times ternate, then pinnate ; ultimate segments linear and entire or 

 cut into linear lobes, puberulent on the midrib and margins; umbel 8-22-rayed, 

 flowers yellow; fruit on very short pedicels; sterile flowers on slender pedicels. 

 Lake Waha, Idaho. A poorly known species. 



