620 AMMIACEAE 



26. CORIOPHYLLUS (M. E. Jones) Rydb. Indian Parsnip. 



Perennial herbs, with more or less fleshy roots, somewhat branched rootstocks 

 covered with fibrous sheaths, and leafy stems. Flowers yellow to purple. Bracts 

 none; bractlets present, but narrow. Leaves pinnately dissected, subcoriaceous, 

 rigid, not fleshy, with ovate or lanceolate, cuspidate or spinulose-tipped lobes. 

 Calyx-teeth evident. Stylopodium wanting. Fruit orbiciilar to oval in outhne, 

 usually emarginate at both ends, compressed laterally if any. Ribs with broad 

 wings. Oil-tubes 1-5 in the intervals, 2-8 on the commissural side. Seeds 

 little if at all flattened dorsally; face deeply grooved. [Cymopterus ^Coriophylliis 

 M. E. Jones.] 



Wings thickened at the insertion. 



Leaves ternately bipinnatifld ; oil-tubes solitary in each interval. 1. C. Jonesii. 



Leaves pinnate, with lobed or divided leaflets; oil-tubes several in each interval. 



Leaves ovate to ovate-oblong in outline; flowers pedicelled. 2. C. Rosei. 



Leaves reniforra to oblong-cordate in outline; flowers sessile. 3. C. basallicus. 

 Wings not thickened at the insertion. 



Flowers purplish; oil-tubes on the commissure 8. 4. C. purpureus. 



Flowers greenish yellow; oU-tubes on the commissure 4. 5. C. Betheli. 



1. C. Jonesii (Coult. & Rose) Rydb. Leaves ternate, then pinnate or bi- 

 pinnate; ultimate segments broad, obovate, with spinulose-tipped teeth; bract- 

 lets lanceolate, small; flowers purjjle; fruit globose, 8 mm. long; wings broad, 

 but very thick at the insertion. Cymopterus and Aulospermum Jonesii Coult. 

 & Rose. Dry places: Utah. Subrnotit. Je. 



2. C. Rosei (M. E. Jones) Rydb. Leaves leathery, smooth, pinnate, with 

 obovate-triangular, toothed, mucronate segments; peduncles 5-10 cm. long; 

 bractlets lanceolate, purplish, barely united at the base; flowers purple; fruit 

 broadly elliptic, 8-10 mm. long; wings broad, thin, sUghtly thickened at the in- 

 sertions. A. Rosei M. E. Jones. Slopes and mesas in alkaline soil: Utah. Sub- 

 mont. Je. 



3. C. basalticus (M. E. Jones) Rydb. Leaves 5-7 cm. long; blades 2.5-4 

 cm. long, reniform or oblong-cordate in outline, 3-5-lobed; lobes pinnatifid and 

 fan-shaped, with apiculate teeth; peduncles thick, 1-1.5 dm. long; flowers white 

 or purplish, sessile; involucels of 8 oval or triangular bractlets; fruit broader 

 than long, emarginate at both ends, 4 mm. long, 3-winged. Cymopterus basalticus 

 M. E. Jones. Bare knolls: Utah. Suhmont. 



i. C. purpureus (S. Wats.) Rydb. Leaves broadly triangular in outline, 

 ternate, then pinnate or bipinnate; divisions obovate, dentate, with mucronate 

 teeth; i)eduncles 1-2.5 dm. high; bractlets lanceolate, united at the base; fruit 

 8-10 mm. long; wings broad, scarcely thickened at the insertions. Cymopterus 

 purpureus S. Wats. A. purpureum Coult. & Rose. Dry plains: Colo. — N.M. 

 • — Ariz. — Utah. Son. — Submo7d. Ap-Je. 



5. C. Betheli (Osterhout) Rydb. Leaves broadly ovate in outline, first 

 ternate, the main divisions bipinnate; leaflets broad, coarsely toothed; peduncles 

 5-10 cm. long; bractlets linear, acuminate; fruit 7-8 mm. long, 6-7 mm. wide; 

 oU-tubes 3-5 in the intervals. A. Betheli Osterhout. Cymopterus duchesnensis 

 M. E. Jones may be the same. Dry hills: Colo. — Utah. Submont. My-Je. 



27. PTERYXIA Nutt. 



Low cespitose perennials, clothed at the base with fibrous sheaths. Leaves 

 finely dissected, the main divisions being ternate, then repeatedly pinnate, with 

 short hnear or subulate, pungent divisions. Bracts mostly wanting; bractlets 

 narrow, not at all hyaline. Flowers yellow or in one species white. Calyx-teeth 

 evident. Stylopodium wanting. Fruit oblong to orbicular in outline, nearly 

 round in cross-section. Ribs all or most of them more or less winged, the lateral 

 ones at least broad-winged; wings thin throughout. Oil-tubes several in the 

 intervals. Seeds usually strongly flattened dorsally; face broadly and shaUowly 

 concave. 



Petals yellow. 



Leaves broadly rhombic in outline. 



Dorsal ribs with broad wings. 1. P. foeniculacea. 



