UMBELLIFERAE (PARSNIP FAMILY) 3G3 



Flowers yellow. 



Roota tuberous or moniliform. 



Umbellets open; pedicels slender . , . . . *. C. ambigua. 

 Umbellets compact; fruit nearly sessile . . . . 2. C. leptocarpa. 



Roots more or less thickened. 



Plant glabrous or nearly so; fruit glabrous. 



Oil-tubes several in the intervals . . . , 3. C. montana. 



Oil-tubes large and solitary. 



Glabrous throughout 4. C. Grayi. 



Slightly puberulent on the herbage ... . 5. C. bicolor. 



Plant pubescent, at least when young. 



Leaves finely dissected, ternate then pinnate. 



Bractlets ot involucels lanceolate, conspicuous and united 



at base . . , . . . . . 6. C. foeniculacea. 



Bractlets linear, smaller, distinct . . . . 7. C. Jonesii. 



Leaves ternate or biternate, with long linear segments . 3. C. platycarpa. 



Flowers white. 



Bractlets not scarious , ;. ... . . . . .9. C. macrocarpa. 



Bractlets scarious-margined 10. C. orientalis. 



1. Cogswellia ambigua (Nutt.) Jones, Contrib. West. Bot. 12: 32. L908. 

 Glabrous, from low acaulescent to 3 dm. high and caulescent, with tuber- 

 ous sometimes moniliform roots: petioles much dilated at base; leaves 

 once to twice pinnate, with more or less elongated linear leaflets, the upper 

 often more dissected: umbel unequally 8-18-rayed, with no involucels; rays 

 2.5-8.5 cm. long; pedicels 4-8 mm. long; flowers yellow: fruit narrowly ob- 

 long, glabrous, 6-8 mm. long, 2 mm. broad, very narrowly winged; oil-tubes 

 solitary in the intervals, 2 (broad and thin) on the commissural side. Wyo- 

 ming and Montana to Oregon. 



2. Cogswellia leptocarpa (Nutt.) Jones 1. c. 33. Acaulescent, becoming 

 3 dm. high, from deep-seated tuberous roots, glabrous: leaves ternate then 

 pinnate, the ultimate segments linear and usually much elongated: umbels 

 with few very unequal rays, and involucels of small linear bractlets ; rays from 

 almost wanting to 7.5 cm. long; flowers yellow: fruit nearly sessile, forming 

 a dense cluster, linear, 9-10 mm. long, 2 mm. broad, with very narrow wings*; 

 oil-tubes solitary in the intervals. Reported from Steamboat Springs, Col- 

 orado; mostly to the northwest of our range. 



3. Cogswellia montana Jones 1. c. 34. Acaulescent, from a slender or 

 somewhat enlarged and elongated rootstock, glabrous except the slightly 

 puberulent inflorescence, 5-20 cm. high: leaves usually twice pinnate, the 

 leaflets short-oblong, obtuse, much crowded: umbel unequally 3-8-rayed, 

 with involucels of distinct, obovate, more or less purplish bractlets; rays 4-30 

 mm. long; pedicels 2-4 mm. long; flowers yellow: fruit oblong, glabrous, 

 5-6 mm. long, 2-3 mm. broad, with wings about half as broad as body; oil- 

 tubes several in the intervals. (Lomatium purpureum A. Nels. Bull. Torr. Bot. 

 Club 28: 226. 1901.) The western Dakotas to Wyoming and Oregon. 



4. Cogswellia Grayi C. & R. Contrib. IT. S. Nat. Herb. 12: 450. 1909. Gla- 

 brous throughout, with peduncles 7.5-22.5 cm. lorfg: leaves ternate then pin- 

 nately decompound, the ultimate segments linear-filiform, elongated or short- 

 cuspidate, exceedingly numerous: umbel rather equally 6-16-rayed, with 

 involucels of distinct linear subulate bractlets; rays 2.5-7.5 cm. long; pedi- 

 cels 10-16 mm. long; flowers yellow: fruit oblong, 8-16 mm. long, 5-9 mm. 

 broad, with wings usually more than half as broad as body, and filiform dor- 

 sal and intermediate ribs: oil-tubes usually solitary in the intervals (some- 

 times 2 in the lateral intervals), 2-4 on the commissural side. Frequent in 

 our range and westward to Oregon and Washington. 



5. Cogswellia bicolor (Wats.) Jones 1. c. 38. Caulescent or scarcely so, 

 1-4.5 dm. high, glabrous or slightly puberulent: petioles wholly dilated; 

 leaves ternate then pinnately decompound, the ultimate segments very nu- 

 merous and filiform: umbel very unequally 2-10-rayed, with involucels of 1-8 

 linear-subulate bractlets; rays 2.5-12.5 cm. long; pedicels short; flowers 

 yellow: fruit linear-oblong, glabrous, 10-12 mm. long, 2-5 mm. broad, with 

 very narrow wings and nearly obsolete dorsal and intermediate ribs; oil- 

 tubes large and solitary in the intervals, 2 on the commissural side. West- 

 ern Wyoming and in Utah and Idaho. 



