CARROT FAMILY 247 



Leaf-divisions several to many; fruit ovate to linear-oblong, 2-6 mm. broad, not constricted above; wings 

 evident. 

 Bractlets linear to linear-lanceolate, sometimes more or less connate. 



Leaf-divisions filiform to linear, mostly elongate, up to 8 cm. long; flowers white or yellow. 

 Flowers yellow; oil-tubes solitary in the intervals. 

 Flowers white; oil-tubes several in the intervals. 

 Bractlets distinct; pedicels lax, 6-17 mm. long. 

 Bractlets more or less connate; pedicels subcrect, 2-5 mm. 



Leaf-divisions short-linear, up to 10 mm. long; flowers white. 



Rays 2-6; fruit oblong-oval; wings corky, brown like the body. 



Rays 12-17; fruit linear-oblong; wings membranaceous, lightei 



Bractlets obovate, sometimes connate. 



Plants acaulescent; oil-tubes 2-4 in the intervals. 

 Plants caulescent; oil-tubes solitary in the intervals. 



III. 



Bractlets oblanceolate to obovate. 



Plants glabrous to pubescent, not scabrous or roughened; umbels 5-13-rayed; wings mostly broader than 



the body. 23. L. utrtculatum. 



Plants scabrous or roughened; umbels 10-25-rayed; wings equaling the body. 22. L. vaginatum. 

 Bractlets mostly linear, never obovate, sometimes reduced to a sheath. 



Young fruit granulate-roughened, not pubescent. 31. L. Peckianum. 



Young fruit variously pubescent, not granulate-roughened. 



Bractlets with a conspicuous scarious margin, never tomentose or villous. 32. L. ncvadense. 

 Bractlets not conspicuously scarious-margined, more or less tomentose or villous. 

 Plants acaulescent, usually low, up to 3 dm. tall. 



Plants more or less villous throughout; petioles shorter than the leaf-blades. 



34. L. Macdougaln. 



Plants hoary-pubescent, never villous; petioles longer than the leaf-blades; deserts of Cali- 

 fornia and adjacent Nevada. 36. L. mohavense. 

 Plants short-caulescent, rarely acaulescent, mostly taller, up to S dm. tall. 



Petals glabrous; fruit narrowly oblong, sparingly pubescent vath long hairs. 



38. L. macrocarpum. 



Petals tomentose; fruit ovate-oblong to orbicular, densely pubescent. 



Pedicels mostly longer than the mature fruit; wings broader than the body, membrana- 

 ceous, thinly pubescent to glabrate. 35. L. dasycarpum. 

 Pedicels mostly shorter than the mature fruit; wings narrower than to equaling the 

 body, somewhat thickened, tomentose. 37. L. tomentosum. 



IV. 



Foliage and peduncles pubescent (or if glabrate, flowers yellow); umbels 2-7-rayed. 41. L. Engelmannii. 

 Foliage and peduncles glabrous (or if scaberulous, not of northern California); umbels 5-16-rayed. 



Flowers white; pedicels 6-10 mm. long; central Sierra Nevada foothills, California. . 



39. L. Ccngdonit. 



Flowers creamy white to yellow; pedicels less than 6 mm. long (except L. angustatum var. flavum). 

 Leaf-division filiform, 3-8 mm. long; southern Sierra Nevada, California. 40. L. Torieyi. 



Leaf-divisions ovate, 1-2 mm. long; Coast Ranges and Cascades, British Columbia to Oregon. 



42. L. angustatum. 



V. 



Bractlets obovate, sometimes connate. 



Plants usually with several stem-leaves; wings broader than the body, the dorsal ribs obsolete. 



Fruit ovate to obovate, 9-15 mm. long; calyx-lobes prominent in young fruit. 



24. L. Vaseyi. 



Fruit oblong to ovate, 5-11 mm. long; calyx-lobes obsolete. 23. L. utriculatum. 



Plants without or with one stem-leaf; wings narrower than the body, or if broader, the dorsal ribs evident. 

 Plants glabrous or slightly pubescent; flowers yellow (or if purple, western Sierra Nevada). 

 Plants cespitose; leaflets crowded; montane Oregon. 20. L. montanum. 



Plants not cespitose; leaflets distinct; California and western Oregon. 



Leaves broadly ovate to obovate; fertile rays 6-15. 28. L. caruifolium. 



Leaves oblong to ovate; fertile rays 2-5. 



Bractlets entire or toothed; leaf-divisions elongate, up to 60 mm. long; California. 



29. L. humile. 



Bractlets 1-3-ternately lobed; leaf-divisions shorter, up to 8 mm. long; Willamette Val- 

 ley, Oregon. ■50. L. Bradshaivii. 

 Plants scaberulous to densely pubescent; flowers white or purple (or if yellow, California North Coast 

 Ranges). 

 Flowers purple or yellow; leaves ternate, then 1-2-pinnate; California North Coast Ranges. 

 *^ 25. L. ciholatum. 



Flowers white; leaves 3-pinnate; Sierra Nevada and Great Basin. 32. L. ncvadense. 



Bractlets filiform to linear-lanceolate, rarely oblanceolate-acuminate, never obovate. 



Bractlets more or less tomentose or villous. 38. L. macrocarpum. 



Bractlets glabrous or minutely and sparingly roughened. 



Fruit 12-16 mm. long, 6-10 mm. broad; wings very narrow and corky-thickened. 



43. L. dtsscctum. 

 Fruit 5-13 mm. long, 3-7 mm. broad; wings thin and membranaceous. 



Plants more or less pubescent. 



Flowers yellow; plants mostly low, less than 3 dm. tall; Great Basin. 



33. L. Plummcrae. 



Flowers white; plants usually taller, up to 4.5 dm. tall. 32. L. ncvadense. 



