206 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
and it is more reasonable to suppose that yellow flowers might have been mistaken 
for white in an herbarium specimen than that a pubescent plant with glabrous invol- 
ucels could have been said to be villous and with tomentose involucels, 
The only other species of Lomatium which grows in the east is L. dancifolium 
(P. foeniculaceum of most writers, but not of Nuttall), but that has yellow flowers, and 
seems not to grow far enough north to be L. foeniculaceum. This is doubtless the 
same species as the Peucedanum villosum Nutt., taken up by Watson from Nuttall MS. 
Some explanation of these eastern plains species of Nuttall (2. foeniculuceun and 
P. villosum) may be helpful to a clearer understanding of the question. Bradbury 
and Nuttall collected together in the upper Missouri, in what is now North Dakota. 
Rafinesque named Bradbury’s plants, and Nuttall named his own. From the same 
region Rafinesque described Lomatiim villosim, and Nuttall described) Ferula foe- 
niculacea. The earlier botanists, as looker, DeCandolle, ete., regarded them as the 
same, and there seems to be no reason to doubt this conclusion. Torrey and Gray, 
however, included with Nuttall’s /vrula foeniculacea (as var. daucifolia) forms from 
the more southern plains, and the name has been gradually shifted to them, so that 
now in the United States National Herbarium the specimens labelled Peucedanum 
Joeniculaceum extend from Nebraska to Texas, entirely south of the type locality of 
Nuttall’s Ferula foeniculacea. In the meantime, Watson took up Peucedanum villosum, 
a manuscript name of Nuttall’s applied to a plant from ‘‘the plains of the Platte,’ 
in Nebraska, and made it to include also plants from the far West. 
A reasonable conclusion seems to be that Lomatium rilloswn Rat. represents the 
plants of the northern plains which have been going under the name of Peueedanum 
villosum Nutt., and which are Nuttall’s Ferula foeniculacea; and that the plants of 
the more southern plains which have been called Peucedaninin foeniculaceum represent. 
another species. The type species of Lomatium, therefore, is L. foenieulaceum as 
defined in this paper. 
Mostly low, from globose tubers; leaves small, more or less dissected. 
FLOWERS WHITE. 
Fruit puberulent ........-----.------------------------------- 1, L. gormant. 
Fruit glabrous. 
Oil tubes none .............---2----- 2-2-2 eee 2. L. geyert. 
Oil tubes present. 
Oil tubes solitary in the intervals. 
Lateral wings thickish .......2-22222222 222222222 -.- 3. L. hendersonii, 
Lateral wings thin......-.---.-.------------------------ 4. L canbyi. 
Oil tubes several in the intervals. 
Pedicels slender, longer than the fruit...........22.-- 5. L. fariiosum, 
Pedicels very short, much shorter than the fruit 
FLOWERS YELLOW. 
Fruit puberulent...................----.-----.0.-.22-2-------- 7. LL. watsoni. 
Fruit glabrous (except in L. cous). 
Fruit linear. 
wee eee eee 6. L. piperi. 
Umbellets open; pedicels slender (4 to 8 mm. long).....- &. L. ambiguum. 
Umbellets compact; fruit nearly sessile.....222.222222.- 9. L, leptocarpum. 
Fruit oblong. 
Rather tall, caulescent ........2...........-.--.--.--. 10. 1. errenmndatium. 
Low, acaulescent. 
Oil tubes solitary in the intervals; fruit pubescent .........- IL. L. cous. 
Oil tubes several in the intervals; fruit glabrous....... 12. L. montanum. 
Usually stouter than the last, from more or less thickened roots. 
PEDUNCLES USUALLY SLENDER, NEVER SWOLLEN AT THE TOP. 
BRACTLETS OF INVOLUCEL CONSPICUOUS, OFTEN BROAD OR UNITED AT BASE, 
