624 AMMIACEAE 



3. P. aletifolia Rj^db. 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. 

 Ps2idocymo])terus alelifolius Rydb. Mountains among rocks: Colo. Submont. 

 — Mo7}t. 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-cymop- 

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



32. COGSWELLIA Spreng. Cous, Biscuit Root, 

 Whisk-broom Parsley. 



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

 Leaves ternately, rarely pinnately, dissected. Flowers j^ellow, white, or purple. 

 Bracts wanting; bractlets usually 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 sohtary or few in the intervals, 2-10 

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

 danum Am. auth. Lomaliimi Raf.] 



Plants slender with thick rounded cornas. 

 Corolla white. 



Bracts not scarious. 



Fruit puberulent. 1. C. Gormani. 



Fruit glabrous. 



Divisions of the leaves oblong, very short, 5 mm. long or less; oU-tubes 



solitary in the intervals. 2. C. Canbyi. 



Divisions of the leaves linear, 1-7 cm. long. 



Wings of the fruit more than half as broad as the body; oU-tubes none. 



3. C. Gei/cri. 

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



4. C. farinosa. 

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



Corolla yellow. 



Fruit linear in outline. 



Divisions of the leaves few, long and linear. 



Umbellets open ; pedicels 4-8 mm. long. 5. C. ambigua. 



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



Divisions of the leaves filiform. 7. C. bicolor. 



Fruit oval in outline; divisions of tlie leaves oblong. 



Caulescent; fi-uit glabrous; oU-tubes solitary m the intervals. 



8. C. circumdaia. 

 Acaulescent or nearly so. 



Fruit puberulent; oil-tubes solitary in tlie intervals. 9. C. Cous. 

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



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



Bractlets of tlie involucels many, conspicuous, often broad, or united at the base. 

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



Involucre present, consisting of a scarious sheath, sometimes produced into 



Unear green lobes. 11. C. concinna. 



Involucre wanting. 10. C. 7nontana. 



Bractlets lanceolate, oblong or linear. 

 Corolla white. 



Bractlets scarious-margined, as well as the whole plant piiberulent or 

 rarelv glabrate. 

 Fruit glal)rous; oil-tubes solitary in the intervals. 12. C. orientalis. 

 Fruit pubescent; oil-tubes several in the intervals. 1.3. C. nevadensis. 

 Bractlets not scarious-margined, villous. 14. C. macrocarpa. 



CoroUa yellow or purple. 



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



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



15. C. villosa. 

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



Ifi. C.Joncsii. 

 Wings of the fruit less than half as wide as the body; bractlets linear, dis- 

 tinct. 17. C. MacDougalii. 

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

 Leaves finely dissected, with numerous small divisions. 

 Fruit oval in outhne. 



