624 AMMIACEAE 



L 



3. P. aletifolia Rydb. Leaves once or twice pinnate, dark green^ glabrous, 

 stiff and shining, 1-2 dm. long; leaf-segments obovate to rhombic-cuneate, 

 deeply cleft; lobes usually 3-toothed with lanceolate acuminate teeth; scapes 

 1-1.5 dm. long; sepals in fruit 1-2 mm. long; fruit 5-6 mm. long, 2.5-3 mm. wide; 

 lateral wings evident but rather narrow; dorsal ribs acute or slightly winged, 

 Psudocyjnopterus aletifoUus Rydb. Mountains among rocks: Colo, Submont. 

 ^Mont. My-Je. 



4. P. Hendersonii (Coult. & Rose) Rydb. Leaves short-petioled, very 

 pale, pinnate; leaflets ovate in outline, deeply cleft into 3-5 linear entire seg- 

 ments; peduncles longer than the leaves; bractlets linear, entire, Pseudo-cipnop- 

 terus Hendersonii Coult. & Rose. Mountains: Ida. Alp. Au. 



32. COGSWELLIA Spreng. Cous, Biscuit Root, 



Whisk-broom Parsley. 



I ^ 



Acaulescent or short-stemmed perennials, with thickened, tuberous roots. 

 Leaves ternately, rarely pinnately, dissected. Flowers yellow, white, or purple. 

 Bracts wanting; bractlets usuallv present. Calyx-teeth usually obsolete. Stylo- 

 podium wanting. Fruit strongly flattened dorsally. Dorsal and intermediate 

 ribs filiform, close together, the lateral ones winged, the wings coherent to those 

 of the other carpel till maturity. Oil-tubes solitary or few in the intervals, 2-10 

 on the commissural- side. Seed-face plane or rarely slightly concave. [Peuce- 

 danurn Am, auth. Lomatium Raf.] 



Plants slender with thick rounded corms. 

 CoroUa white. 



Bracts not scarious. ^ ^ 



Fruit puberulent. 1- C*. Gormam. 



Fruit glabrous. , _ ., .„k«c 



Divisions of the leaves oblong, very short, 5 nun. long or less; oil-tuoes 



solitary in the intervals. 2. C. Canoyi. 



Divisions of the leaves linear, 1-7 cm. long. , ., ^ x „^«^ 



Wmgs of the fruit more than half as broad as the body; oil-tubcs none. 



3. C. Geyen. 



Wmgs of the fruit less than half as broad as the body; oil-tubes several. 



4. C. fannosa. 



Bracts scarious-margined. (See C orientalis, C. nevadensis, &c.) 



Corolla yellow. 



Fruit linear in outline. 



Divisions of the leaves few, long and linear. h- un 



IJnibellets open; pedicels 4-8 mm. long. . 5. C. ^^f^^^ ' 



Umbellets compact; fruit nearly sessile. 6. C. iepwcarpa. 



Divisions of the leaves ftUform. 7. C. Oicolor, 



Fruit oval in outline: divisions of the leaves oblong. 



Caulescent; fruit glabrous; oil-tubes solitary in the intervals. . mdata 



Acaulescent or nearly so. « /-« i^ o 



Fruit puberulent; oil-tubes solitary in the intervals. 9. C. L^ous. 

 Fruit glabrous; oil-tubes several in the intervals. 10. C. montana. 



Plant generally stouter from a thickened root or rootstock, rarely corm-hke. 



Bractlets of the involucels many, conspicuous, often broad, or united at tne oase. 

 Bractlets obovate or spatulate; whole plant glabrous; corolla yellow. 



Involucre present, consisting of a scarious sheath, sometimes proaucea mt^ 



Unear green lobes. H. g- concmna. 



Involucre wanting. 10. C, montana. 



Bractlets lanceolate, oblong or linear. 



Corolla white. , i^nt nr 



Bractlets scarious-margined. as well as the whole plant puberuieni oi 



rarely glabrate. ^ • 4„uo 



Fruit glabrous; oil-tubes sohtary in the intervals. 12. C. onentam 

 Fruit pubescent; oU-tubes several in the intervals. 13. C. nevadensis. 

 Bractlets not scarious-marguied. villous. 14. C. macrocarpa. 



Corolla yellow or purple. 



Wings of the fruit half as wide as the body or broader. 



Bractlets more or less united, densely villous; corolla yellow. 



15. C. villosa. 



Bractlets distinct, less densely vUlous; corolla often tinged with purple. 



16. C.Jonesti. 



"Wings of the fruit less than half as wide as the body; bractlets ^^5;*^.^?." 

 thict. 17. C, MacDougahi^ 



Bractlets of the involucels none or very few, linear or subulate. 

 Leaves finely dissected, with numerous small divisions. 

 Fruit oval in outline. 



