CARROT FAMILY 613 



pinkish, in many-rayed umbels. Bracts usually wanting; bractlets narrow. 

 Calyx-teeth small or obsolete. Stylopodium conic. Fruit oblong or ellipsoid, 

 flattened laterally if at all, glabrous. Ribs all prominent and equal, acute, 

 sometimes slightly winged. Oil-tubes 2-6 in the intervals, 6-10 on the commis- 

 sural side. Seeds with rounded or angled back; face from plane to deeply con- 

 cave. 



Stem leafy; divisions of the leaves not filiform. 



Ultimate divisions of the leaves 2-3 cm. wide; involucels none. 1. L. verticillatum. 

 Ultimate divisions of the leaves less than 2 cm. wide, laciniate or pinnatifid. 

 Ultimate divisions of the leaves ovate to lanceolate. 



Lateral primary divisions less than half as long as the terminal one; leaves 

 therefore appearing pinnate; oil-tubes in the intervals 3, on the com- 

 missure 6-8. 3. L. simulans. 

 Lateral primary divisions at least two-thirds as long as the terminal one; the 

 leaves therefore appearing ternate; oil-tubes in the intervals 4-6, on 

 commissure 6-10. 

 Secondary leaflets not cleft to near the midrib; fruit 4 mm. long. 



2. L. Canbyi. 



Secondary leaflets cleft to near the midrib; fruit 5-6 mm. long. 

 Leaves thin and dark green. 



Fruit almost 5 mm. long; stylopodium conic. 4. L. Leibergii. 

 Fruit about 6 mm. long; stylopodium low and broad. 



Ultimate lobes of the leaves lanceolate, 5-10 mm. long. 



5. L. Porteri. 

 Ultimate lobes of the leaves ovate or oblong-ovate, usually less 



than 5 mm. long. 6. L. brevilobum. 



Leaves thicker, pale green. 7. L. affine. 



Ultimate divisions of the leaves or teeth linear or linear-lanceolate. 



8. L. filicinum. 

 Plant subscapose or with a single leaf; ultimate divisions of the leaves linear-filiform. 



9. L. tenuifolium. 



1. L. verticillatum (Geyer) Coult. & Rose. Stem 6-7 dm. high; leaves once 

 or twice ternate, then pinnate; leaflets 2.5-7.5 cm. long, ovate to oblong, serrate, 

 pale beneath, glabrous; umbels many-rayed, compact; involucels none; fruit 

 oblong, 6 mm. long; ribs winged; stylopodium low-conic. Borders of woods: Ida. 

 Submont. Je-Jl. 



2. L. Canbyi Coult. & Rose. Stem about 6 dm. high; leaves mostly basal* 

 biternate; leaflets lanceolate, 7.5-10 cm. long, pinnately parted below, toothed 

 above; bractlets linear; fruit 4 mm. long; ribs winged; stylopodium slender- 

 conic; oil-tubes 5 or 6 in the intervals, 6-8 on the commissure. Low ground: 

 Mont. Ida. Wash. B.C. Submont. Mont. Jl-S. 



3. L. simulans Coult. & Rose. Stem 6-9 dm. high; leaves mostly basal, 

 twice pinnate; leaflets oblong or lanceolate, toothed or cleft; bracts and bractlets 

 linear; fruit oblong, 4-5 mm. long; ribs with narrow thin wings; stylopodium low- 

 conic. Wet meadows: Wyo. Mont. Au. 



4. L. Leibergii Coult. & Rose. Stem glabrous, 1 m. or more high; leaves 

 twice ternate, then pinnate; leaflets lanceolate, acuminate, laciniately cleft into 

 lanceolate, pointed, sometimes toothed lobes; peduncles often verticillate around 

 a central one, 1-4 dm. long; involucels few, subulate; fruit oblong, 4-5 mm. long; 

 ribs with narrow wings; stylopodium conic; oil-tubes 4-6 in the intervals. 

 Rich soil: Ida. Wash. Submont Mont. Je-Au. 



6. L. Porteri Coult. & Rose. Stem 6-10 dm. high, leafy; leaves large, bi- 

 ternate and then pinnate; leaflets numerous, lanceolate or ovate, pinnatifid or 

 toothed, with oblong-lanceolate divisions or teeth; bracts and bractlets usually 

 lacking; fruit oblong, 6-7 mm. long; ribs prominently winged; stylopodium 

 broad and low; oil-tubes 4-6 in the intervals. Woods: Wyo. N.M. Ariz. 

 Mont. Subalp. Jl-Au. 



6. L. brevilobum Rydb. Stem 6-8 dm. high, glabrous; leaves twice ternate 

 and then pinnate; segments cleft into ovate or oblong-ovate lobes which are 

 seldom more than 5 mm. long, prominently veined; involucres and involucels 

 usually wanting; fruit short-oblong, nearly as in the preceding; stylopodium 

 low-conic. Open woods: c Utah. Mont. Subalp. Jl-Au. 



7. L. affine A. Nels. Stem 5-10 dm. high; leaves biternate, then once or 

 twice pinnate; leaflets ovate-oblong, deeply cleft into linear-oblong or linear- 



