CARROT FAMILY 621 



Dorsal ribs with narrow wings. 2. P. Elrodi. 

 Leaves oblong or ovate in outline. 



Pinnae very small and distant. 3. p. petraea. 



Pinnae larger and crowded. 4. p. calcarea 



Petals white. 5. p. albiflord. 



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

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

 divisions, which are scarcely salient; fruit broadly oval, 6-7 mm. long, wings 

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

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



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-shaped 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 pinnately 

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

 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 oblanceolate, 

 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 wider 

 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, foliaceous. 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. 1. C. acaulis. 



Ultimate divisions of the leaves short, broadly oblong, obtuse; fruit 7-10 mm. long. 

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

 wings strongly thickened. 2. C. Parryi. 



