OF ARTS AND SCIENCES. 14o 



six lines long; involucres of several linear bractlets : flowers a line and 

 a half to two lines long ; disk and stylopodium obsolete ; styles united 

 to the middle : fruit (still immature) a line and a half long. — North- 

 ern California, in shaded mountain ravines and moist places. Much 

 resembling A. racemosa, but with larger flowers and involucres, and 

 fewer umbels, larger and with more numerous rays. 

 y CoRNUS ToRiiEYi. A shrub : leaves obovate or oblanceolate,- 

 abruptly acute or shortly acuminate, on rather long slender petioles, 

 lighter colored and somewhat pubescent beneath with loose silky hairs : 

 cyme loose and spreading : fruit white ; stone obovoid, somewhat com- 

 pressed, acute at base, ridged on the edges, tubercled at the summit, 

 two and a half to three and a half lines long. — Collected by Dr. Tor- 

 rey in Central Calitbrnia, but locality not noted. It is very peculiar 

 in the characters of the fruit. 



19. P. DASYCARPUM, Torr. & Gray. Villous-tomentose : leaves finely dis- 

 sected : invohicels of several linear to oval bractlets : fruit often acutish, tonien- 

 tose, 4 to 7 lines long ; ribs prominent ; vittae usually 3 (rarely solitary) in the 

 intervals, 4 on the commissure. — P. tomentosum, Benth. PI. Hartw. 312. Cali- 

 fornia. 



20. P. Nevadense, Watson. See above. 



Excluded Species. 



P. Newberrti, Watson, Am. Naturalist, 7. 301. Fine fruiting specimens of 

 this were collected in Southern Utah by Dr. C. C. Parry. The wing of the 

 fruit is found to have a thick corky margin, which requires the reference of the 

 species to Ferula (Leptofcenia, Nutt.), a genus separated by only this character 

 from Peucedanum. The habit of the plant is very uulike that of our other 

 species of Ferula. 



TiEOEMANNiA TERETiFOLiA, DC, referred to Peucedanum by Benth. & Hook. 

 As compared with our own species of Peucedanum, and without reference to 

 foreign forms which may be included in it, this genus appears sufhciently well 

 marked, differing in the distinct marginal nerve of the wings, in the prominent 

 conical stylopodiura, in the presence of an involucre, and in the very remarkable 

 habit. 



Archemora, DC, another small genus of the Atlantic States reduced to 

 Peucedanum by the same authorities, though less distinctly marked than the 

 last, may still conveniently be retained. It differs from the western species in 

 its tall-stemmed erect aquatic habit, thick and short conical stylopodia with 

 short spreading styles, the commissural vittae in part often shorter than the 

 seed, and the habit of foliage and inflorescence somewhat peculiar. A. Feudleri, 

 Gray, of New Me.xico and Colorado, is less clearly marked than the two more 

 eastern species. 



VOL. XI. (n. S. III.) 10 



