FLOWERING PLANTS AND FERNS OF ARIZONA 361 



5. Basal leaves not as above; whole plant usually more or less pallid 



with dense soft pubescence 5. D. helleriaxa. 



1. Plants winter annual, except D. crassifolia, a small scapose biennial or short- 

 lived perennial (6). 

 6. Petals yellow at anthesis, often fading to whitish; plants of elevations at 

 or above 6,000 feet (7). 

 7. Stems leafy nearly or quite to the inflorescence; whole plant, including 

 the pods, copiously pubescent 6. D. rectifructa. 



7. Stems scapose (or with one leaf); plants sparsely pubescent, the pods 



nearly always glabrous 7. D. crassifolia. 



6. Petals white or whitish at anthesis; plants winter annuals of elevations 

 usually less than 6,000 feet (8). 



8. Stems leafy up to the inflorescence; basal leaves petioled; pods 2 to 5 mm. 



long; leaves all entire or some of them sparingly dentate. 



10. D. BRACK YCARPA. 



8. Stems not leafy up to the inflorescence; basal leaves sessile or nearly so; 

 pods 4 to 14 mm. long; some or all of the leaves usuallv coarselv 

 few-toothed (9). 



9. Inflorescence and pedicels glabrous 8. D. reptaxs. 



9. Inflorescence and pedicels pubescent (10). 



10. Racemes elongate, usually at least half the total height of the 

 plant; pods averaging 3.5 mm. wide; pedicels as long as the fruits 



or nearly so 9. D. plattcarpa. 



10. Racemes usually not half the total height of the plant; pods averag- 

 ing not more than 3 mm. wide; pedicels seldom as long as the 

 fruit 11. D. CUXEIFOLIA. 



1. Draba asprella Greene, Torrey Bot. Club Bui. 10: 125. 1883. 

 Coconino and Yavapai Counties, perhaps also in Gila County, 6,000 



to 7.000 feet, pine forests, local, commencing to flower in April, type 

 from Lynx Creek, Yavapai County (Rusby in 1883). Known only 

 from Arizona. 



In addition to the typical form there occur in Arizona var. kaibensis 

 C. L. Hitchc. and var. setigera Schulz. The former, which has been 

 collected at the Grand Canyon (Cottam 2650), differs in having soft, 

 very dense pubescence, the petioles and lower portion of the scape 

 with branched hairs only. The var. setigera, known from Flagstaff 

 (MacDougal 22, Pvrpus in 1902), is distinguished by coarser stiffer 

 pubescence. Both the varieties have forked to stellate pubescence on 

 the fruits as contrasted with simple or once-forked hairs in the species. 



2. Draba standleyi Macbr. and Pavson, Mo. Bot. Gard. Ann. 5: 150. 



1918. 



Draba gilgiana Woot. and Standi., Contrib. U. S. Natl. Her- 

 barium 16: 124. 1913. Not of Muschler, 1906. 



Chiricahua Mountains, 8,500 feet (Blumer 1538). New Mexico, 

 Texas, and southeastern Arizona. 



3. Draba aurea Yahl in Hornem., Fl. Dan. 9 15 : 3. 1818. 



San Francisco Peaks (Coconino Countv), White Mountains (Apache 

 County), 10.000 to 12.000 feet, July to August. Widely distributed 

 in the cooler parts of the Northern Hemisphere. 



The Arizona specimens mostly belong to var. leiocarpa (Payson and 

 St. John) C. L. Hitchc. (D. aureiformis var. leiocarpa Payson and St. 

 John) with relatively small flowers, short glabrous pods, and short 

 fruiting styles, but approaches to the typical form in some of these 

 characters also occur. 



