CARROT FAMILY 619 



25. PHELLOPTERUS Nutt. 



Perennial herbs, with deep-seated fleshy roots, a subterranean stem merely 

 reaching the surface of the ground and there bearing a cluster of leaves and 

 naked peduncles. Leaves from once to thrice pinnate, rather fleshy. Flowers 

 white or purplish. Calyx-teeth evident. Stylopodium wanting. Fruit oblong 

 to orbicular in outline, nearly orbicular in cross-section. Ribs or most of them 

 with thin broad wings, which sometimes are somewhat thickened at the inser- 

 tion; the lateral distinct from those of the other carpel. Oil-tubes usually more 

 than one in each interval. Seeds more or less flattened dorsally; face broadly 

 and shallowly concave. 



Wings of the fruit thin and broad, scarcely rugose. 



Peduncles even in fruit shorter than the leaves; wings thickened at the insertion. 



Flowers white; fruit 68 mm. long. 1. P. montanus. 



Flowers purple; fruit 10-14 mm. long. 2. P. macrocarpus. 

 Peduncles at least in fruit equalling or exceeding the leaves; wings not thickened at 



the insertion; fruit more than 8 mm. long. 

 Involucels 1-3-nerved ; corolla purplish. 



Fruit oblong. 3. P. bulbosus. 



Fruit orbicular. 4. P. utahensis. 

 Involucels 5-13-nerved. 



Bracts white with green middle; corolla white or pink. 5. P. camporum. 



Bracts and corolla purple. 6. P. multinervatus . 



Wings of the fruit thick, somewhat corky and rugose. 7. P. Jonesii, 



1. P. montanus Nutt. Leaves twice or thrice pinnate, with oblong toothed 

 divisions, somewhat glaucous; peduncles 1-5 cm. long; involucre inconspicuous, 

 hyaline and lobed; involucels conspicuous, of obovate entire distinct bractlets; 

 fruit broadly elliptic to nearly orbicular, 6-8 mm. long. Cymopterus montanus 

 T. & G. Dry plains: S.D. Kans. Colo. Wyo. Plain Submont. Ap-My. 



2. P. macrocarpus Osterhout. Leaves narrow in outline, 1 dm. long, 

 glaucous, bipinnate, with oblong divisions; flowers purple; involucres small, 

 scarious, divided; bractlets distinct, white and scarious, with green midrib; fruit 

 orbicular or rounded-oval, 10-14 mm. long; oil-tubes 3-5 in the intervals and 

 usually 6 on the commissure. Dry plains: Colo. Plain. Ap-My. 



3. P. bulbosus (A. Nels.) Coult. & Rose. Leaves bipinnatifid; divisions 

 cleft into oblong lobes, crowded; peduncles 5-10 cm. long; involucre of broad 

 hyaline bracts united at the base; involucels of obovate hyaline bracts, with 

 greenish midribs; fruit elliptic, 8 mm. long. C. bulbosus A. Nels. Clayey hills: 

 Wyo. Submont. My-Je. 



4. P. utahensis (M. E. Jones) Woot. & Standl. Leaves twice or .thrice 

 pinnatifid, with obovate or oblong, toothed or lobed divisions; peduncles 1-1.5 

 dm. long; involucres and involucels conspicuous, of white or purplish bracts, 

 with 1-3 green or purple veins; fruit orbicular or oval, 10-12 mm. long. P. pur- 

 purascens Coult. & Rose. C. utahensis M. E. Jones. Clayey or gravelly soil: 

 N.M. Colo. Ida. Nev. Ariz. Son. Ap-My. 



6. P. camporum Rydb. Leaves twice to thrice pinnatifid, petioled, pale- 

 green; ultimate divisions oblong, obtusish, 3-6 mm. long; peduncles 5-20 cm. 

 long, usually exceeding the leaves; involucres of white hyaline bracts; bractlets 

 orbicular, 5-7 mm. long; fruit with the very broad wings 10-13 mm. long and 

 9-11 mm. wide. Dry mesas: Colo. Son. Submont. My. 



6. P. multinervatus Coult. & Rose. Leaves as in the preceding; peduncles 

 about 1 dm. long; involucres low hyaline-lobed sheaths or sometimes resembling 

 the involucels, which are composed of broad bracts united at the base; fruit 

 orbicular, 12-15 mm. long. C. purpurascens M. E. Jones. Dry places: N.M. 

 Utah Nev. s Calif. F-My. 



7. P. Jonesii (Coult. & Rose) Rydb. Leaves somewhat fleshy, oblong 

 to ovate in outline; leaflets 3, the lateral ones deeeply 2-cleft, the terminal 

 one 3-cleft; divisions cleft and crenate; umbels solitary; bractlets distinct to 

 near the base, ovate, acuminate; fruit 3 mm. long. Rhysopterus Jonesii Coult. 

 & Rose. Dry places: Utah. Submont. Ap. 



