420 CONTKIBUTIONS FROM THE NATIONAL HERBARIUM. 



Taller plants, the roots elongate, hardly tuberous. 



Peduncles stout, often much swollen at the summit. 

 Fruit very large, 18 to 28 mm. long; leaf segments 



narrow 9. L. sulcsdorfii. 



Fruit smaller 8 to 14 mm. long. 



Loaf segments lanceolate 10. Z,. nudicaule. 



Leaf segments ovate to orbicular 11. Z. jJatyphyllum. 



Peduncles less stout, never swollen at the top. 

 Bract lets conspicuous. 



Flowers yellow; leaves glabrous 12. L. ntriculatum. 



Flowers white. 



Herbage tomentose 13. L. macrocarpum. 



Herbage pubonilent 14. L. artemisiarum. 



Bractlets small or wanting. 



Fruit linear; flowers long-pedicelled 15. Z. ambiguum. 



Fruit oblong. 



Leaves pinnate. 



Oil tubes solitary in the intervals.. . 16. L. martindalei. 



Oil tubes 3 in each interval 17. L. luiUii. 



Leaves temate. 



Wings of the fniit broad. 



Ill-scented, the leaves finely 



dissected 21. L. grayi. 



Not ill-scented, the leaves not 



finely dissected 18. />. laevigatum. 



Wings of the fruit narrow. 



Ovaries glabrous 19. Z. tritematum. 



0\'aries puberulent. 



Ijeaf segments lanceolate, 



elongate, usually entire... 20. L. robvstius. 

 Leaf segments oblong, rather 



short, often toothed 22. Z. hrevifolium. 



1. Lomatium gonnsmi (Howell) Coult. & Rose, Contr. Nat. Herb. 7: 208. 1900. 

 Peucedanum gonnani Howell, Fl. N. W. Am. 1: 252. 1898 (April 1). 

 Peucedanum confusum Piper, Erythea 6: 29. 1898 (April 10.) 



Type locality: On "high hills opposite The Dalles," Washington. Collected by 

 Howell. 



Range: Eastern Oregon, eastern Washington, and adjacent Idaho. 



Specimens examined: Wenache Mountains, Whiled 60; North Yakima, Mrs. Steinweg 

 in 1894; Klickitat, Howell 411; Rock Creek, Sandberg cfe Leiberg 84; Pullman, Piper 1565; 

 Elmer 73; Wawawai, Piper 1566; Colfax, Vasey, April 13, May 5, 1902; Waitsburg, Homer 

 4; Spokane County, Leiberg 7.50; Klickitat Hills, Gorman, April, 1895. 



Zonal distribution: Arid Transition. 



2. Lomatium geyeri (S. Wats.) Coult. & Rose, Contr. Nat. Herb. 7: 209. 1900. 

 Peucedanum geyeri S. Wats. Proc. Am. Acad. 14: 293. 1879. 



Peucedanum evittatum Coult. & Rose, Bot. Gaz. 14: 277. 1889. 



Type locality: "Sandy woods and plains, upper Columbia River; the biscuit-root of 

 the Indians." Collected by Geyer, no. 458, probably along the lower Spokane River. 



Range: Eastern Washington and northern Idaho. 



Specimens examined: Wenache, Whited 1007 and May 17, 1896; Badger Mountain, 

 Whited, April 22, 1900; Roslyn, Whited, April 25, 1898; Ellensburg, Whited 270; Piper, 

 May 20, 1897; Fort Colville, Lyall in 1861; Spokane, Piper 2300, 2941, 2697; Henderson 

 2502; Hangman Creek, Sandberg cfc Leiberg 7; Ellensburg, Vasey in 1889. 



Zonal distribution : Arid Transition and Upper Sonoran. 



