248 UMBELLIFERAE 



Plants glabrous or occasionally scaberulous, never pubescent; flowers purple or yellow. 

 Plants acaulescent or with a pseudoscape. 



Peduncles stout, fistulose; pedicels 1S-2S mm. long; fruit 16-24 mm. long, 8-12 mm. 



broad. 44. L. columbianum. 



Peduncles slender; pedicels 3-22 mm. long; fruit 5-7 mm. long, 3-8 mm. broad. 



Leaf-divisions lanceolate to oblanceolate, minutely papillose above; bractlets finely 



puberulent; Snake River drainage. 49. L. serpentinum. 



Leaf-divisions filiform, linear or linear-oblong, glabrous or scaberulous; bractlets 

 glabrous, rarely slightly scaberulous. 

 Leaves oblong to ovate, 4-10 cm. long; fruit 3-5 mm. broad. 

 Fertile rays 8-30; pedicels 3-15 mm. long. 



Fruit ovate to ovate-oblong, 4-5 ram. broad; wings less than half the 

 width of the body; northern Great Basin. 



50. L. Donnellii. 



Fruit oblong, 3 mm. broad; wings about half the widthof the body; 

 western Oregon. 54. L. Hallii. 



Fertile rays 1-6; pedicels 1-S mm. long; northwestern California and south- 

 western Oregon. 26. L. Tracyi. 



Leaves obovate, 6-26 cm. long; fruit 5-8 mm. broad. 



Leaf-divisions remote, elongate, up to 80 mm. long; petioles wholly sheath- 

 ing or nearly so; bractlets scarious-margined; California. 



27. L. inarginatum. 



Leaf-divisions crowded, shorter, up to 11 mm. long; petioles sheathing only 

 at base; bractlets not scarious-margined; Great Basin. 



45. L. Grayi. 

 Plants short-caulescent. 



Leaf-divisions remote, mostly elongate, up to 80 mm. long. 27. L. marginatum. 



Leaf-divisions crowded, shorter, up to 11 mm. long. 



Petioles wholly sheathing; fruit acute at the apex; east-central California and ad- 

 jacent Nevada. H- L. Plummerae. 

 Petioles partially sheathing; fruit rounded at the apex; Great Basin. 



Peduncles stout, fistulose; rays stout. 47. L. minus. 



Peduncles and rays slender. 



Leaf-divisions rigid, cuspidate; flowers purple. 48. L. cuspidattim. 

 Leaf-divisions herbaceous; flowers yellow or salmon-yellow. 



Fruit-wings thick, corky, colored like the body; flowers salmon-yellow. 



46. L. salmoniflorum. 



Fruit-wings thin, membranaceous, rarely obsolete, lighter-colored than 

 the body; flowers yellow. 45. L. Grayi. 



VI. 



Plants acaulescent or short-caulescent; leaves 1 --2-pinnate ; rarely 3-pinnate. 

 Foliage pubescent. 



Acaulescent; ovaries and fruit pubescent. 51. L. creganum. 



Caulescent, branching; ovaries and fruit glabrous. 18. L. Rollinsii. 



Foliage glabrous. 



Leaves 2-3-pinnate. 



Rays subequal, suberect; pedicels 10-17 mm. long; fruit 9-12 mm. long, wings equaling or some- 

 what broader than the body; desert mountain ranges. 53. L. Parryi. 

 Rays unequal, spreading; pedicels 4-7 mm. long; fruit 5-7 mm. long, wings about half the width 

 of the body; western Oregon. 54. L. Hallii. 



Leaves pinnate, rarely bipinnate. 



Plants less than 1 dm. tall; leaf-blades less than 2.5 cm. long. 52. L. Greenmanii. 



Plants more than 1 dm. tall; leaf-blades more than 2.5 cm. long. 55. L. Martindalei. 



Plants mostly caulescent, tall; leaves ternate-pinnately or quinate-pinnately divided. 

 Plants variously pubescent. 



Ovaries and young fruit glabrous. 



Leaves biternate; bractlets shorter than the pedicels; fruit 7-14 mm. broad, the wings equaling to 



broader than the body. 56. L. simplex. 



Leaves ternatepinnate; bractlets equaling the pedicels; fruit 3-S mm. broad, the wings narrower 

 than the body. 57. L. triternatitm. 



Ovaries and young fruit pubescent. 



Leaves biternate; wings equaling or broader than the body. 56. L. simplex. 



Leaves ternate-pinnate ; wings narrower than the body. 



Fruit 24-28 mm. long; pedicels 6-17 mm. long. 61. L. Suksdorfii. 



Fruit 8-22 mm. long; pedicels 1-9 mm. long. 57. L. triternatum. 



Plants glabrous or rarely slightly scaberulous, never pubescent. 



Plants 9-21 dm. tall; fruit 15-32 mm. long. 61. L. Suksdorfii. 



Plants 1-12 dm. tall; fruit 6-15 mm. long. 



Plants 3-12 dm. high; leaf-division cuneate to obovate, 5-40 mm. broad, glaucous; southern 



Oregon and California. 63. L. californicum. 



Plants 1-4 dm. high; leaf-divisions filiform to oblong or oblanceolate, 0.5-8 mm. broad, not 

 glaucous; central and eastern Oregon and Washington. 

 Stems simple or occasionally few-branched; leaf-divisions filiform to oblong. 



Flowers white or purplish; involucels about equaling flowers; pedicels 2-6 mm. long. 



58. L. Cusickii. 



Flowers yellow; involucels wanting or inconspicuous; pedicels 4—15 mm. long. 



Leaves ternate-pinnate or partially biternate; leaf-divisions few; rays 3-7; fruit 



10-12 mm. long, 3-4 mm. broad. 60. L. idahoensc. 



Leaves ternate, then 2-3-pinnate; leaf-divisions numerous; rays 9-20; fruit 6-10 

 mm. long, 4-6 mm. broad. 59. L. laevigatum. 



Stems few-branched; leaf-divisions linear-lanceolate to oblanceolate; fruit usually rcflexed. 



62. L. Brandegei. 



