Carrot Family 289 



19. LOMATIUM Raf. 



Acaulescent or short caulescent dry-ground perennials, 

 with fusiform or tuberous roots, ternate sometimes pin- 

 nate to dissected leaves, no involucre, and yellow, white 

 or purple flowers. Calyx-teeth usually obsolete. Fruit 

 strongly flattened dorsally, oblong to orbicular. Carpel 

 with filiform and approximate dorsal and intermediate 

 ribs, and winged laterals coherent until maturity with 

 those of the other carpel ; pericarp thin with strengthen- 

 ing cells beneath each rib. Stylopodium wanting. Oil- 

 tubes 1-several in the intervals, rarely obsolete, 2-10 on 

 the commissural side. Seed dorsally flattened with 

 plane or rarely slightly concave face. (Peucedanum.) 



1. L. utriculatum (Nutt.) G. &'R. Caulescent or nearly acau- 

 lescent, csespitose to 3 dm. high or more, from a more or less 

 thickened root, puberulent or glabrous ; petioles very broadly 

 dilated; leaves ternately or pinnately decompound, with ulti- 

 mate segments narrowly linear 12 mm. or less long; umbel 

 unequally 5-20-rayed; bracts much dilated, mostly obovate, often 

 toothed ; rays 5 cm. long or less ; pedicels 4-10 mm. long ; flowers 

 yellow; fruit broadly elliptic, glabrous, 4-10 mm. long, 2-7 mm. 

 broad, with wings nearly as broad as the body, and prominent 

 dorsal and intermediate ribs; oil-tubes large, solitary in the 

 intervals, 4-6 or sometimes 2-3 on the commissural side, very short 

 accessory ones in the intervals ; seed-face somewhat concave. 



Frequent on the mesas and grassy foothills. 



2. !L. Vaseyi C. & R. Short, caulescent, 15-20 cm. high; 

 slightly pubescent ; petioles wholly inflated ; leaves small; 2.5-5 

 cm. long, bipinnate, with the small ovate segments irregularly 

 3-5-lobed; umbel equally 2-5-rayed ; bractlets obovate, petiolu- 

 late, toothed; rays 2.5 cm. long; pedicels 2-4 mm. long; flowers 

 yellow; fruit broadly oblong, emarginate, glabrous, 12-14 mm. 

 long, 8 mm. broad, with wings twice as broad as the body, and 

 mostly prominent dorsal and intermediate ribs ; oil-tubes solitary 

 in the intervals, 4 on the commissural side. 



Frequent in heavy soil on the mesas throughout our range. 



