CARROT FAMILY 171 



Umbels open; petals yellow; involucre present, although often a mere vestige. 



Divisions of the leaves narrow. 5. C. Fendleri. 



Division.s of the leaves broad. 6. C. Newberryi. 



30. PSEUDOCYMOPTERUS Coult. & Rose. 



Petals light yellow ; bractlets linear-subulate, longer than the flowers. 

 Plant over 1 dm. liigh, with distinct leafy stems. 



Ultimate divisions of the leaves short, ovate or lanceolate; leaves ovate in outUne. 



1. P. montanus. 

 Ultimate divisions of the leaves linear, elongate. 



Leaves, at least the basal ones, ovate in outUne. 2. P. sylvaticus. 



Leaves, at least the basal ones, broadly rhombic in outUne. 



Plant slender; leaves mostly twice compound, with very long and few 



divisions. 3. P. tenuifolius. 



Plant low; leaves thrice pinnate with shorter, more numerous divisions. 



4. P. muUifidus. 

 Plant less than 1 dm. liigh, nearly acaulescent. 5. P. Tidestromii. 



Petals piu-ple, or orange tinged with purple; bractlets linear-lanceolate or lanceolate, 

 shorter than the flowers. 

 Stem 2-3 dm. liigh; ultimate leaf-segments narrowly linear. 6. P. versicolor. 



Stem 0.5-1.5 dm. high, nearly leafless; ultimate divisions of the leaves short, oblong 

 or lanceolate. 7. P. purpureus. 



31. PSEUDOPTERYXIA Rydb. 

 Leaves with long petioles; scape 1-3 dm. high. 



Primary divisions of the leaves once or twee dissected, with narrowly linear divisions. 

 Ultimate divisions of the leaves 5-10 mm. long; fruit about 6 mm. lon§. 



1. P. longiloba. 

 Ultimate divisions of the leaves 3-5 mm. long ; fruit about 4 mm. long. 



2. P. anisala. 

 Primary divisions broad, cuneate-flabellate, cleft or toothed, with short, ovate or 



lanceolate teeth. 3. P. aletifolia. 



Leaves on short petioles; divisions linear; scape less than 1 dm. high. 4. P. Hendersonii . 



32. COGSWELLIA Spreng. Cous, Biscuit Root, Whi.sk-broom Parsley. 

 Plants slender with thick rounded corms. 



Corolla white. 



Bracts not scarious. 



Fruit puberulent. 1. C. Gormani. 



Fruit glabrous. 



Divisions of the leaves oblong, very short, 5 mm. long or less; oil-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; oil- tubes none. 



3. C. Geyeri. 

 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. nevadeiisis, &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; friiit nearly sessile. 6. C. leptocarpa. 



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



Fruit oval in outline; divisions of the leaves oblong. 



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



8. C. circumdata. 

 Acaulescent or nearly so. 



Fruit puberulent; oil-tubes soUtary in the intervals. 9. C. Cous. 

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



Plant generally stouter from a tliickened root or rootstock, rarely corra-like. 



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

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



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



linear green lobes. 11. C. concinna. 



Involucre wanting. 10. C. montana. 



Bractlets lanceolate, oblong or Unear. 

 Corolla white. 



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

 rarely glabrate. 

 Fruit glabrous; oil-tubes solitary in the intervals. 12. C. orientalis. 

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

 Bractlets not scarious-margined, 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 villous; corolla often tinged with purple. 



16. C. Jonesii. 



