34 Contributions from the Gray Herbarium 
i.e. 6-8 mm. in length. Moreover the lateral wings of these fruits 
are quite as “‘ corky-thickened ”’ as those of Mr. Nelson’s plants, 
some of which are also 6-8 mm. long. In short there appears to 
be no difference between the A. Lyallii Wats. and A. arguta Nutt. 
which indubitably is well represented by Mr. Nelson’s specimens. 
Nevertheless, Rydberg, Fl. Rocky Mts. 631 (1917), recognizes 
three species here which he distinguishes from each other by the 
shape of the leaflets and their teeth and the presence or absence 
of pubescence. For instance he distinguishes his A. Piperi by the 
presence of pubescence on the leaves and the obtuse teeth of the 
leaflets, overlooking the fact that plants from British Columbia 
which he refers to A. Lyallii are more or less pubescent as is also 
Watson’s plant from Montana, the latter being a part of the ma- 
terial upon which Watson founded A. Lyallii! And as for the 
obtuse teeth the fact is evident that the leaflets of Lyall’s spec 
men, which are essentially but not absolutely glabrous, have very 
broad obtuse teeth quite similar indeed to the dentation of the 
leaflets of cotype material of A. Piperi. In as much as there 1s ne 
correlation between the shape of the teeth of the leaflets and the 
presence or absence of pubescence and since these characters exist 
in every degree they are not even of varietal let alone specific 
significance. Rydberg’s interpretation of specific values m some 
cases passes all understanding especially when viewed in connee 
tion with his conservative drawing of specific lines in certain other 
groups, as in Calochortus. 
¥YLomatium simplex (Nutt.), comb. nov. Peucedanum sim 
Nutt. ex Wats. Bot. King Exp. 129 (1871). P. triternatum ( mp 
Nutt., var. platycarpum Torr. Stansb. Rep. 389 (1852). Lomah a 
platycarpum (Torr.) Coult. & Rose, Contrib. U. 8. Nat. Herb. : 
226 (1900). Cogswellia simplex (Nutt.) Jones, Bull. Univ. Mont., 
Biol. ser. xv. 41 (1910). a 
In Contrib. Gray Herb. liii. 15 (1918) I have asserted the vali 
of the generic name Lomatium Raf. 
Cynomaraturum Nutt. ex Coult. & Rose, Contrib. U.S. ee 
Herb. vii. 244 (1900). Several years ago when studying a yar oe 
men of C. Nuttallii (Gray) Coult. & Rose, I was impressed ae: 
the general resemblance of this plant to certain species of vane 
Now again I have had occasion to refer to C. N uttallit aD: we 
time I have considered carefully its generic status and have 0° 

