COULTER AND ROSE—NORTH AMERICAN UMBELLIFERAE. 185 
8. Cymopterus lapidosus Jones, Contrib. Western Botany no. 8:31. 
1898. Fic, 54. 
Peucedanum lapidosum Jones, Zoe 2: 246. 1891. 
Glabrous; leaves and peduncles borne in a cluster at the summit of 
a more or less elongated subterranean stem arising from a long 
branching root; leaves 5 to 
10 em. long, pinnate to bi- 
pinnate, the pinnae rather 
crowded, ovate, lower ones 
incised, upper ones entire; 
peduncles sometimes shorter 
than the leaves, or becoming 
1.5 to 2 em. high, bearing a 
nearly equally rayed umbel, 
with involucels of several 
linear bractlets; rays 1 to 2 
em. long; pedicels 4 mm. 
long; flowers white; fruit 
oblong, glabrous, 6 to 7 mm. 
long, 2 to 2.5 mm. broad, 
with wings half as broad as 
body or less, and prominent 
dorsal and intermediate ribs 
(more or less winged): oil tubes several in the intervals. 
Tvpe locality not given, but label states ‘* Echo City, Summit 
County, Utah;” collected by Jones, May 7, 1890; type in Herb. Jones, 
duplicate in U.S. Nat. Herb. 
Northwestern Utah and adjacent Wyoming. 
Fre. 54.—Cymopterus lapidosus: a, b, x 8. 
Specimens examined : 
Uran: Type specimens as cited under type locality. 
Wyomrna: Granger, Sweetwater County, Jones, June 24, 1896. 
Mr. Jones describes this species as ‘‘a delicate, heavy-scented plant, growing under 
rocks like ferns, spreading flat on the ground, or erect in more exposed situations.” 
The relationship of this species is very doubtful, and until it has been more care- 
fully studied. it must remain under Cymopterus, although it is not congeneric with 
the above species. It may represent a new generic type. 
Cymopterus nivalis Watson is 1 poorly known species. For a state- 
ment concerning it, see under P’sendoeymopterus. 
538. RHYSOPTERUS ©. & K., ven. nov. 
Calyx teeth evident. Fruit flattened laterally, nearly orbicular in 
outline, glabrous. Carpel flattened dorsally, boat shaped (margins 
and ends incurved), with 5 equal prominent corky obtuse ribs, which 
are wing like and very much wrinkled when young. Carpophore 
wanting (at least not showing in ripe fruit). Stvlopodium wanting. 
Oil tubes small, solitary in the intervals, 2 on the commissural sidé 
Seed boat-shaped, with a broad and deep sulcus. 
