264 UMBELLIFER.E. SANICULA. 



PIMPINELLA. 



cordate 2-4 inches broad, very deeply 3-5-lobed, the broad segments 

 sharply toothed or somewhat cleft, the teeth bristle- tipped ; upper leaves 

 more narrowly lobed and laciniately toothed: umbel with 3-4 slender 

 rays, involucre of 2-3 small leaf -like bracts, and involucels of 6-8 small 

 entire bracelets ; flowers yellow, the sterile ones nearly sessile : fruit be- 

 coming distinctly pedicellate and divergent, obovate 1-2 lines long, covered 

 with strong prickles : seed-face plane. Brit. Columbia to California. 



t- *- Mature fruit sessile. 



* Leaves pinnate ly divided. 



S. laciniata Hook & Arn. 1. c. 147 Stems more or less branching, 

 6-18 inches high; from a thickened root-stock: leaves mostly palmately 

 3-5-parted, the divisions 1-2 pinnatifid, segments laciniately toothed*, 

 the teeth spinosely pointed: umbel 3-5 rayed, with involucre of 

 leaf-like bracts, and involucels of lanceolate spinosely pointed bractlets; 

 flowers yellow, the sterile ones on long pedicels : fruit somewhat naked 

 below, more prickly above lj=^ lines long: seed-face deeply sulcate some- 

 what involute. California to the Willamette Valley, Oregon. 



S. Nevadensis Watson Proc. Am. A cad. xi, 139. Stem slender some- 

 times very short, simple or branching near the base, a foot or less high : 

 leaves ternate, the divisions oblong-ovate, 3-5 lobed ; the segments lobed 

 or toothed : umbel with about 5 rays, which are sometimes branched and 

 become 6-18 lines long in fruit ; involucre of pinnatifid leaf-like bracts ; in- 

 volucels of small oblong acute bractlets : flowers yellow, the sterile ones 

 pediceled : fruit prickly all over 1)^ lines long : seed-face plane. Dry open 

 woods, Brit. Columbia to California and Kevada. 



+* -n- Leaves more or less pinnately divided. 



S. Mpinnatiflda Dougl. Hook, Fl. i, 258. Stems a foot or more high 

 from a thickened rootstock : with usually a pair of opposite leaves at base 

 and 1-3 leaves above ; leaves pinnately 3-7 parted, the divisions incisely 

 toothed or lobed, decurrent on the toothed rhachis, teeth acute or slightly 

 pointed ; umbel with 3-4 elongated rays : involucre of leaf-like bracts, and 

 involucels of small narrow merely acute bractlets ; flowers purple, in dense 

 heads, the sterile ones on long pedicels : fruit prickly all over. Seed-face 

 broadly concave with a prominent central longitudinal ridge. Common 

 in open places Brit. Columbia to California. 



S. hip inn at a Hook. & Arn. 1. c. 347. A foot or more high from a 

 slender fusiform root : leaves twice or thrice pinnate, with divisions not at 

 all decurrent, cuneate-oblong to ovate, incisely and mucronately toothed : 

 umbel S-4 rayed, with involucre of leaf -like bracts and involucels of a few 

 small bractlets more or less united : flowers yellow: fruit tuberculate at 

 base, prickly above: seed-face deeply sulcate, more or less involute, with 

 a central longitudinal ridge. California to the southern boundary of Ore- 

 gon. 



* * Fruit neither prickly nor scaly. 



22 PIMPINELLA L. Gen. n. 366. 



Glabrous perennials with ternately or pinnately compound 

 leaves, involucre and involucels scanty or none, and white or 

 yellow flowers. Calyx-lobes obsolete : fruit oblong to ovate, 

 glabrous, carpel with equal slender ribs : stylopodium depressed 

 or cushion-like. Oil-tubes 2-6 in the intervals, 4-8 on the com- 

 missure : seed somewhat dorsally flattened. 



P. apiodora Gray Proc. Am. Acad. vii, 345. Smooth, rather stout, 



