RYDBERG: Rocky MOUNTAIN FLORA 73 
in their Monograph and were trying to determine the plant, the 
key would lead to Aulospermum or Phellopterus, to either of which 
genera it is not even closely related. Mr. Jones included it in 
Oreoxis, to which I admit it is related, but the ribs are not corky, 
the stylopodium present, the styles reflexed, the flowers white, 
not yellow, and the bractlets scarious. 
Pseudoreoxis Rydb. gen. nov. 
Low cespitose acaulescent perennials, with branched caudex. 
Leaves bipinnate; the segments more or less cleft with small 
lanceolate divisions. Flowers white in small umbels; bracts want- 
ing; bractlets ovate or lanceolate, cuspidate or abruptly acumi- 
nate, scarious, white with a green midrib. Calyx-teeth evident but 
small. Stylopodium present but low and flat. Styles reflexed. 
Fruit somewhat flattened laterally, oblong. Ribs all with narrow 
wings, the lateral ones scarcely wider. Oil tubes 3 or 4 in the 
intervals, 6-8 on the commissure. Seed face slightly concave. 
Pseudoreoxis bipinnatus (S. Wats.) Rydb. 
Cymopterus bipinnatus S. Wats. Proc. Am. Acad. 20: 368. 1885- 
Pseudocymopterus bipinnatus C. & R. Rev. N. Am. Umbel. 75. 
1888. 
Pseudoreoxis nivalis (S. Wats.) Rydb. 
Cymopterus nivalis S. Wats. Bot. King. Exped. 123. 1871. 
I do not hesitate to refer this species to the same genus as P. 
bipinnatus, although the fruit is unknown, for the habit, and 
flowers are so closely resembling those of P. bipinnatus. 
Cynomarathrum latilobum Rydb. sp. nov. 
Acaulescent perennial with densely cespitose caudex covered 
by old. broad leaf-sheaths; leaves about 1 cm. long, pinnate, 
glabrous; leaflets entire or 2- or 3-cleft into broadly lanceolate, 
reticulate, thick, pointed segments 5-15 mm. long; peduncles 
I-1.5 dm. long, stout; rays 1-2 cm. long; bractlets linear or 
lance-linear, 5-6 mm. long; flowers apparently straw-colored or 
ochroleucous; fruit about 9 mm. long, 6 mm. wide; lateral wings 
about as broad as the body; dorsal ribs filiform or some of them 
narrowly winged; oil tubes 2-4 in the intervals, 4-6 on the com- 
missure, rather obscure. _ 
The fruit of this species is intermediate between that of C. 
Nuttallii and C. Parryi, but the plant differs from both, as well as 
from all the known species, in the broad segments of the leaves. 
