144 PROCEEDINGS OF THE AMERICAN ACADEMY 



distinct : flowers white : calyx-teeth obsolete : fruit somewhat pubes- 

 cent, rounded to ovate, three to five lines long, two to four wide ; ribs 

 prominent ; vittfe two or three in the intervals (sometimes four in the 

 lateral ones, perhaps sometimes solitary), four to six on the commis- 

 sure. — P. nudicaule, Watson, Bot. King's Rep. 130, and others ; not 

 Nutt. Eastward of the Sierra Nevada from N. E. California to Sonora 

 and New Mexico. 

 ^ Aralia Califorxica. Herbaceous, unarmed and nearly glabrous, 

 eight to ten feet high, from a deep thickened root : leaves bipinnate, 

 or the upper pinnate with one or two pairs of leaflets ; leaflets cordate- 

 ovate, four to eight inches long, shortly acuminate, simply or doubly 

 serrate with short acute teeth ; terminal leaflets ovate-lanceolate : umbels 

 in loose terminal and axillary compound or simple racemose panicles, 

 which are more or less glaudulur-tomeutose ; rays numerous, four to 



* * Fruit oblong : caulescent, glabrous. 



14. P. BicoLOR, Watson, 1. c. Stem short ; peduncle elongated : rays few, 

 very unequal : involucel of a few linear bractlets : fruit on short pedicels, 5 to 6 

 lines long, narrowing from near the base, narrowly winged ; ribs filiform ; vittae 

 obscure. — Wahsatch Mountains. 



§ 4. Leaves smaller, much or finely dissected with small segments : flowers 

 yellow : involucels present : low, acaulescent. 



^ 15. P. A'lLLOsuM, Nutt. More or less densely pubescent : leaves of very 

 numerous crowded narrow segments : umbels dense in flower : involucels small : 

 fruit oval, pubescent, 3 or 4 lines long ; vittae several in the intervals. — AY. 

 Nevada to Nebraska and S. Utah." 



IG. P. Parrti, Watson. See above. 



§ 5. Leaves much dissected with small segments : flowers white ; involucels 

 present : usually low, somewhat caulescent or scarcely so, more or less pubes- 

 cent. 



* Fruit glabrous, oblong or broadly elliptical ; vittae usually solitary. 



•'^ 17. P. MACROCARPUJr, Nutt. More or less pubescent : involucels conspicu- 

 ous, somewhat foliaeeous : fruit 4 to 10 lines long, 2 or 3 wide; calyx-teeth 

 evident ; ribs filiform ; vittse rarely 2 or 3 in the intervals, 2 to ^ on the commis- 

 sure — Yar. ECRVCARPiTM, Gray. Fruit broader : leaves rather more coarsely 

 divided. — Washington Territory to N. California and east to the Saskatclia- 

 wan ; the variety from Oregon to the Sacramento. 



-^ 18. P. KUDiCAULE, Nutt. Nearly glabrous : involucels small : fruit elliptical, 

 2 or 3 lines long ; calj'x-teeth obsolete ; ribs prominent ; vittae always solitary, 

 2 to 4 on the commissure. — Nebraska and N. Colorado to Idaho. 



* * Fruit tomentose or puberulent, oval-orbicular ; vittae usually several in tlie 

 intervals. 



