Rydberg : Rocky Mountain flora 73 



in their Monograph and were trying to determine the plant, the 

 key would lead to A ulospermum 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 I cm. long, pinnate, 

 glabrous; leaflets entire or 2- or 3-cleft into broadly lanceolate, 

 reticulate, thick, pointed segments 5-15 mm. long; peduncles 

 1-1.5 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. 



