CARROT FAMILY 621 



Dorsal ribs with narrow wings. 2 P Elrodi 

 Leaves oblong or ovate in outline. 



Pinnae very small and distant. 3 p pctrara 



Pinnae larger and crowded. 4 P calcan n 



Petals white. 5 ; p am fi ora . 



1. P. foeniculacea Nutt. Stem few-leaved below or nearly scapifonn, 1-3 

 dm. high; leaves 3-4 times ternate, then pinnatifid into oblanceolat< -toothed 

 divisions, which are scarcely salient; fiuit broadly oval, 6-7 mm. long, winx 

 broad, scarcely undulate. Cymopterus foeniculaceus T. & G. Gravelly soil and 

 dry places: Wyo. Colo. Utah Ore. Wash. Son. Submont. Ap .11. 



2. P. Elrodi (M. E. Jones) Rydb. Stem few-leaved below, about 3 dm. 

 high; leaves ovate or deltoid in outline, ternate,- then pinnately decompound: 

 segments filiform, pungent, about 2.5 mm. long; bractlets needle-shiipcd and 

 short; fruit about 9 mm. long and half as wide, truncate at the apex and slightly 

 emarginate at the base; oil-tubes 5 in the intervals and 14 on the commissure. 

 Cymopterus Elrodi M. E. Jones. Among loose rocks and gravel: Mont. Jl. 



3. P. petraea (M. E. Jones) Coult. & Rose. Stem few-leaved, 3 dm. high; 

 leaves mostly basal, twice pinnate, with distant pinnae, and then pirmately 

 divided into short narrow segments; fruit narrowly oval, 4-6 mm. long; latent! 

 wings 'half as broad as the body; dorsal wings still narrower. C. petraeus M. E. 

 Jones. Dry places: Ore. Ida. Nev. Son. Submont. Je-Jl. 



4. P. calcarea (M. E. Jones) Coult, & Rose. Stem few-leaved, 2-3 dm. 

 high; leaves 3-4 times pinnately dissected into linear crowded divisions; fruit 

 elliptic, 6-7 mm. long; dorsal wings rather narrow. C. calcarea M. E. Jones. 

 Stony draws and foot-hills: Wyo. Utah Nev. Ore. Submont. Je-Jl. 



5. P. albiflora Nutt. Stem 1-2 dm. high; leaves twice or thrice ternate, 

 the ultimate divisions divaricate and 3-cleft; involucels of several linear bract- 

 lets; fruit nearly orbicular, 4 mm. long; wings more or less undulate. C. albi- 

 florus T. & G. Mountains: Mont. Ida. Wyo. Submont. Jl. 



28. PSEUDOREOXIS Rydb. 



Low cespitose acaulescent perennials, with branched caudex. Leaves bi- 

 pinnate, the segments cleft into small lance-oblong to linear-oblong divisions. 

 Flowers white, in small umbels; bracts wanting; bractlets obovate or oblanceolatc, 

 cuspidate or acuminate, white, with green midrib. Calyx-teeth evident, but 

 small. Stylopodium low and flat; styles reflexed. Fruit somewhat flattened 

 laterally, oblong. Ribs all with narrow wings, the lateral wings scarcely \\ider 

 than the dorsal ones. Oil-tubes 3 or 4 in the intervals, 6-8 on the commissure. 

 Seed-face slightly concave. 



1. P. bipinnatus (S. Wats.) Rydb. Leaves 5-8 cm. long, glaucous, more 

 or less puberulent, rarely glabrous; peduncles 1-2 dm. high; flowers white; 

 fruit 3-4 mm. long. Cymopterus bipinnatus S. Wats. Pseudocymopterus bipin- 

 natus Coult. & Rose. Cynomarathrum Macbridei A. Nels. Dry mountains: 

 Mont. Wyo. Ore. Submont. Mont. Je-Jl. 



29. CYMOPTERUS Raf. 



Dwarf subacaulescent perennials, with deep-seated thick root. Leaves 

 pinnate or bipinnate. Bracts wanting or rarely few, small and linear; bractlets 

 conspicuous, fcliaceous. Flowers white or yellow. Calyx-teeth obsolete or 

 evident. Fruit flattened dorsally, oval, in ours glabrous. Dorsal and inter- 

 mediate ribs filiform or some of them usually winged ; the lateral ones with broad 

 thickened corky wings. Stylopodium wanting. Oil-tubes 4-12 in the intervals, 

 8-14 on the commissure (in ours). Seed-face plane. 



Umbels dense, globular; petals white; involucre wanting. 

 Involucels of linear to oblong bractlets. 



Ultimate divisions of the leaves linear or linear-oblong, acutish: fruit orbicular, 



6-8 mm. long. 



Ultimate divisions of the leaves short, broadly oblong, obtuse; fruit ',-10 mm. long. 

 Bractlets oblong, rarely lanceolate, obtuse; fruit orbicular, 8-10 mm. broad; 

 wings strongly thickened. 2. C. Parryi. 



