CARROT FAMILY 619 



25. PHELLOPTERUS Nutt. 



Perennial herbs, with (leep-se:ited fleshy roots, a subterranean stem merely 

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

 naked pedmicles. Leaves from once to thrice i)innate, rather fleshy. Flowers 

 white or i)ur})lish. 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 6-8 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 tliickened 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 5-1.3-nerved. 



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



Bracts and corolla purple. 6. P. muUinervatus. 



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 broadh' elliptic to nearly orbicular, 6-8 mm. long. Cymopterus montanus 

 T. & G. Dry olains: 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 lo'bes, 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. Subtnnnt. I\Iy-Je. 



4. P. utahensis (M. E. Jones) Woot. & Standi. 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 Coidt. & Rose. C. utahensis M. E. Jones. Clayey or gravellv soil: 

 N.M.— Colo.— Ida.— Xev.— Ariz. Son. Ap-My. 



5. 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 hyahne-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. Drv places: N.M. — 

 Utah— Xev.— s Cahf. 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 sohtary; bractlets distinct to 

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

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



