WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 283 



The species strongly resembles the preceding, but may easily be recognized by the 

 elongated claws of the petals. It sometimes branches somewhat profusely at the top, 

 usually having but a single stem from a root. 



6. Cheirinia wheeleri (Rothr.) Rydb. Bull. Torrey Club 39: 324. 1912. 

 Erysimum wheeleri Rothr. in WTieeler, Rep. U. S. Surv. 100th Merid. 6: 64. 1879. 

 Erysimum asperum alpestre Cockerell, Bull. Torrey Club 18: 168. 1891. 

 Cheiranthus uiteeleri Greene, Pittonia 3: 135. 1896. 



Erysimum alpestre Rydb. Bull. Torrey Club 28: 277. 1901. 



Type locality: Camp Grant, Arizona. 



Range: In the higher mountains of Arizona, New Mexico, and Colorado. 



New Mexico: Santa Fe and Las Vegas mountains; Tunitcha Mountains; Sierra 

 Grande; Mogollon Mountains; Hanover Mountains; Sandia Mountains; AMiite and 

 Sacramento mountains. Upper Transition to Arctic- Alpine Zone. 



This is the slender species of our mountains in the coniferous timber. At the higher 

 elevations the petals are nearly always reddish brown or maroon, drying purplish; 

 lower down they are yellow or orange. The plant is 70 cm. high or less, with some- 

 times 2 or 3 erect stems from a root. The siliques are the longest borne by any of our 

 species, frequently 12 to 13 cm. long, slender, nearly terete, somewhat divaricate, but 

 at first erect. 



7. Cheirinia aspera (Nutt.) Rydb. Bull. Torrey Club 39: 323. 1912. 

 Cheiranthus asper Nutt. Gen. PL 2: 69. 1818. 



Erysimum asperum DC. Reg. Veg. Syst. 2: 505. 1821. 



Type locality: '"On the plains of the Missouri, commencing near the confluence of 

 White River." 



Range: Saskatchewan to Arkansas and New Mexico. 



New Mexico: Sierra Grande; Castle Rock; Yermejo Park. Plains and low hills, in 

 the Upper Sonoran Zone. 



24. RADICXJLA Hill. 



Glabrous or hispid annual or perennial herbs with yellow or white flowers; sepals 

 flat, nearly equal at the base; petals short-clawed; siliques usually subterete, not com- 

 pressed, short; style short and thick; valves one-nerved; seeds in two rows, not flat- 

 tened. 



KEY TO THE SPECIES. 



Petals white; aquatic plant, immersed and rooting; leaves pinnate. 1. R. nasturtium- 



aquaticum. 

 Petals yellow; terrestrial or marsh plants; leaves pinnatifid. 



Perennials with rootstocks; leaf segments acute or acutish, the 

 terminal one lanceolate. 



Segments of the leaves toothed; style 0.5 mm. long 2. R. sylvestris. 



Segments of the leaves entire; style 1.5 mm. long. 



Pods papillose * 3. R. calycina. 



Pods not papillose 4. R. sinuata. 



Annuals or biennials; leaf segments obtuse, the terminal 

 broadly oblong to ovate. 



Pods spherical. (Plants low, diffuse, glabrous) 5. R. sphaerocarpa. 



Pods oblong or elongated, never spherical. 



Stems more or less hirsute 6. R. hispida. 



Stems glabrous. 



Sterna erect, sparingly branched; pods cylindric, 



8 to 10 mm. long 7. R. terrestris. 



Stems spreading or ascending, much branched; 

 pods short-oblong or ovoid, 3 mm. longer 

 less 8. R. obtusa. 



