CARROT FAMILY 253 



17. Lomatium ambiguum (Nutt.) Coult. & Rose. Wyeth's Lomatium. 



Fig. 3557. 



Eutophus ambiguus Nutt. Journ. Acad. Phila. 7:27. 1834. 

 Feucedanum tenuissimntn Geyer ex Hook. Lend. Journ. Bot. 6: 23S. 1847. 

 PeHCcdanum abrotanifolium Nutt. Journ. Acad. Phila. II. 1: 184. 1848. 

 Lomatium ambiguum Coult. & Rose, Contr. U.S. Nat. Herb. 7:212. 1900. 



Plants caulescent, 6-44 cm. tall, glabrous, stems solitary or clustered at the base, alternately 

 few-branched above, from tuberous somewhat moniliform roots or elongated taproots. Leaves 

 ternate-pinnate, the upper 2-3-pinnate ; leaf-divisions linear, 3-50 mm. long ; rays 5-17, unequal, 

 15-80 mm. long; bractlets absent; pedicels 4-8 mm. long; flowers yellow; fruit narrovi^ly oblong, 

 8-10 mm. long ; wings very narrow ; oil-tubes solitary in the intervals, 2 on the commissure. 



Stony or gravelly ground, Upper Sonoran and Arid Transition Zones; eastern British Columbia to eastern 

 Oregon, eastward to western Montana and northern Utah. Type locality : "Flat-Head River, Oregon, Montana. 

 April-July. 



18. Lomatium RoUinsii Math. & Const. Rollins' Lomatium. Fig. 3558. 



Lomatium Rollinsii l^lath. & Const. Bull. Torrey Club 70: 59. 1943. 



Plants caulescent, alternately branching, 2.5-5 dm. tall, from an elongate and often tuberous 

 taproot, crisped-puberulent. Leaves bipinnate or partially 3-pinnate; leaf-divisions linear, 2-30 

 mm. long, puberulent; rays 4-8, ascending, 1.5-5 cm. long, unequal, puberulent; bractlets tili- 

 form, minute; pedicels 6-15 mm. long; flowers yellow; fruit oblong-ovate, 6-7 mm. long; wmgs 

 half the width of the body ; oil-tubes 1-2 in the intervals, 4 on the commissure. 



Basaltic slopes, Upper Sonoran and Arid Transition Zones; Snake River Canyon, Oregon and Idaho. Type 

 locality: Deep Creek, Snake River Canyon, Wallowa County, Oregon. April-May. 



19. Lomatium Cous (S. Wats.) Coult. & Rose. Cous or Biscuit Root. Fig. 3559. 



Peucedanum Cous S. Wats. Free. Amer. Acad. 21 : 453. 1886. 

 Lomatium Cous Coult. & Rose, Contr. U.S. Nat. Herb. 7: 214. 1900. 



Plants acaulescent or short-caulescent, 2-2.5 dm. tall, from a globose, sometimes more or 

 less elongate tuber. Leaves ternate, then 2-3-pinnate or pinnately decompound; leaf-divisions 

 crowded, ovate to oblong, 1-5 mm. long mostly glabrous ; rays 10-20, spreading, unequal, 1-5 

 cm. long ; bractlets oblanceolate, shortly connate below ; pedicels 2-4 mm. long ; flowers yellow ; 

 fruit oblong-oval, 7-10 mm. long, granulate-roughened ; wings narrower than the body ; oil-tubes 

 usually solitary in the intervals, 4 on the commissure. 



Rocky ridges. Arid Transition Zone; southeastern Washington and central Oregon to western Idaho. 

 Type locality: John Day Valley, Oregon. April-June. 



20. Lomatium montanum Coult. & Rose. Mountain Lomatium. Fig. 3560. 



Lomatium montanum Coult. & Rose, Contr. U.S. Nat. Herb. 7:214. 1900. 

 Lomatium purpureum A. Nels. Bull. Torrey Club 28:226. 1901. 



Plants acaulescent, 1-3 dm. tall, glabrous, cespitose from a thickened taproot or a sub- 

 globose tuber. Leaves ternate, then 2-3-pinnate; leaf -divisions crowded, oblong, 2-10 rnm. long; 

 rays 5-15 unequal, 1-6.5 cm. long; bractlets obovate, distinct or united below, purplish; pedi- 

 cels 2-3 mm. long; flowers yellow; fruit oblong to oval, 5-12 mm. long; wmgs narrower than 

 to about equaling the body ; oil-tubes 2-4 in the intervals, 6 on the commissure. 



Mountain slopes and ridges. Arid Transition and Canadian Zones; Wallowa Mountains, eastern Oregon, 

 to western Montana and Wyoming. Type locality: mountain ridges in Yellowstone National Park. April-June. 



21. Lomatium circumdatum (S. Wats.) Coult. & Rose. Wallowa Lomatium. 



Fig. 3561. 



Peucedanum circumdatum S. Wats. Proc. Amer. Acad. 22:474. 1887. 

 Lomatium circumdatum Coult. & Rose, Contr. U.S. Nat. Herb. 7:213. 1900. 



Plants caulescent, 1.5-3.5 dm. tall, glabrous to somewhat pubescent, from an elongate to 

 subglobose tuber. Leaves ternate, then 1-2-pinnate; leaf-divisions linear, 6-10 mm. long; rays 

 7-12 ascending 2-8 cm. long ; bractlets obovate, acute, prominently nerved, sometimes connate ; 

 pedicels 2-3 mm. long ; flowers yellow ; fruit oblong, 6-9 mm. long, glabrous ; wmgs much nar- 

 rower than the body ; oil-tubes solitary in the intervals, 4 on the commissure. 



Rocky ridges. Arid Transition Zone; eastern Washington to southeastern Oregon and adjacent Idaho 

 and Nevada. Type locality: hillsides in the Wallowa region of eastern Oregon. May-June. 



22 Lomatium vaginatum Coult. & Rose. Vaginate or Sheathed Lomatium. 



Fig. 3562. 



Lomatium vaginatum Coult. & Rose, Contr. U.S. Nat. Herb. 7 : 223. 1900. 

 Lomatium Plummerae var. Helleri Mathias, Ann. Mo. Bot. Card. 25: 258. 1937. 



Plants caulescent, 2.3-4.5 dm. tall, scabrous, from an elongate, more or less thickened root. 

 Leaves ternate, then 1-2-pinnate; leaf-divisions crowded, oblong 1-5 mm. long ; petioles en- 

 tirely sheathing in the stem leaves; rays 6-15, ascending, unequal, 1-8 cm. long; bractlets ob- 

 lanceolate to obovate, acute; pedicels 3-12 mm. long; flowers yellow; fruit broadly oval to 



