UMBELLIFERJ1. 323 



the divisions ternate and pinnately quinate, or biternate. Ultimate 

 segments 24 inches long. Umbel of very numerous rays. Involucre 

 none. Involucel of about nine very narrow leaves. Fruit immature, 

 but the vittse evidently single in each interval. 



2. Angelica arguta, Nutt. in Torr. & Gray. 



Hab. Mountains of Northern California, towards the sources of the 

 Sacramento. — A more slender plant than A. genvflexa. It is en- 

 tirely smooth. Leaflets about three times longer than broad, tapering 

 to the summit, rather acutely angular at the base. Peduncles elon- 

 gated ; the common base subtended by large inflated petioles, which 

 are nearly destitute of lamina. Kays very numerous and slender. 

 Involucre and involucels none. Fruit nearly 5 lines long, elliptical- 

 oblong, the dorsal ribs slightly prominent. Vittse solitary in the 

 intervals, and usually four in the commissure. Our plant differs from 

 an original specimen of Nuttall's in the narrower and longer leaflets, 

 and smaller remote serratures. 



There are specimens in the collection of an Angelica, collected by 

 Kev. Mr. Spalding on the Kooskooskee, which seem almost inter- 

 mediate between the two species here noticed. It has the leaves of 

 A. genuflexa, and the umbels of A. arguta, but the fruit being wanting 

 it cannot be certainly determined. 



18. HERACLEUM, Linn. 



1. Heracleum lanatum, Michx. 



Heracleum lanatum, Michx., Fl. 1, p. 166 ; Torr. & Gray, Fl. 1, p. 632. 



Hab. Interior of Oregon (var. vestitum), Puget Sound, and near 

 San Francisco. — Except in the more softly pubescent leaves, and villous 

 peduncles and branches, the Oregon plant differs in no respect from 

 the Californian specimens. 



