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 wheelert Rothr. in Wheeler, Rep. U. 8. Surv. 100th Merid. 6: 64. 1879. 
Erysimum asperum alpestre Cockerell, Bull. Torrey Club 18: 168. 1891. 
Cheiranthus wheelerit Greene, Pittonia 3: 135. 1896. 
Erysimum alpestre Rydb. Bull. Torrey Club 28: 277. 1901. 
Tyre Locauity: 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; White 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. 
Tyrer Locauity: ‘‘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; Vermejo Park. Plains and low hills, in 
the Upper Sonoran Zone. 
24. RADICULA 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 yeilow; 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...........-2--- 2c eee eee ee ee eee ences 3. R. calycina. 
Pods not papillose.........-..--------- eee eee eens 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.........-.-2--.2.2-220----- 6. R. hispida. 
Stems glabrous. 
Stems erect, sparingly branched; pods cylindric, 
8 to10 mm. long.............------.-+-- 7. R. terrestris. 
Stems spreading or ascending, much branched; 
pods short-oblong or ovoid, 3 mm. long or 
CS 8. R. obtusa. 
