FLOWERING PLANTS AND FERNS OF ARIZONA 341 



37. Stem leaves sessile or nearly so, the blades not 

 cordate but often auriculate or sagittate; 

 plants glabrous or very nearly so; anthers- 

 sagittate (38). 

 38. Stigma conic, often pointed, entire or nearly so; 

 outer sepals strongly gibbous at base; petals 

 10 to 15 mm. long, purplish pink; stem leaves 



not clasping 3. Hesperidaxtht rs. 



38. Stigma not conic or pointed; outer sepals not 

 or not strongly gibbous; petals less than 10 

 mm. long or, if longer, violet purple; stem 

 leaves often clasping (39). 

 39. Pods torulose, the septum with a central 

 strip of elongate cells appearing, at low 

 magnification, like a broad yellowish mid- 

 vein; stigma lobes, if any, at a right angle 

 to the septum, hence over the valves. 



2. Thelypodium. 

 39. Pods not torulose, the septum undifferenti- 

 ated; stigma lobes, if any, parallel to the 

 septum 12. Sisymbrium. 



1. STANLEYA. 44 Desertplume 



Plants perennial, herbaceous or slightly surTrutescent, rather coarse; 

 stems tall, stout; leaves with entire or pinnatifid blades; flowers large 

 for the family, in elongate terminal racemes; petals yellow or cream- 

 colored, with long claws; stamens not or scarcely tetradynamous, the 

 anthers long and narrow, often curved; capsules long-stipitate, 

 slender, nearly terete. 



The plants grow usually on seleniferous soils, hence are probably 

 poisonous to livestock. S. pinnata is an outstanding seleniferous 

 plant. The Indians used the plants as a potherb and made mush 

 with the seeds. 



Key io the species 



1. Petals with the claw glabrous on the inner face, the blade about 1 mm. wide, 

 the petals yellow to nearly white; leaves entire or nearly so, 3 to 10 cm. 

 wide; plant glabrous 1. S. elata. 



1. Petals with the claw densely pubescent on the inner face, the blade 1.5 mm. 

 wide or wider; lower stem leaves usually pinnatifid (2). 

 2. Plant suffrutescent; petal blades oblong, 1.5 to 3 mm. wide, bright yellow. 



2. S. PIXXATA. 



2. Plant herbaceous; petal blades obovate, 4 to 10 mm. wide, pale yellow or 

 whitish 3. S. albescexs. 



1. Stanleya elata M. E. Jones, Zoe 2:16. 1891. 



North of Tuba, Coconino County (Jaeger in 1927, cited by Rollins). 

 Northern Arizona to southeastern California. 



2. Stanleya pinnata (Pursh) Brit ton, X. Y. Acad. Sci. Trans. 8: 



62. 1889. 



Cleome pinnata Pursh, Fl. Amer. Sept. 739. 1814. 



Apache County to Mohave, Yavapai. Gila, and Yuma Counties, 

 2,500 to 6.000 feet, dry plains and mesas, May to July. North 

 Dakota to Idaho, south to Texas, Arizona, and California. 



The Arizona specimens belong to var. typica Rollins. 



3. Stanleya albescens M. E. Jones, Zoe 2: 17. 1891. 



Moenkopi (Jones in 1891, the type collection) and north of Cameron 

 (Coconino County), Hopi Villages and Coal Mine Canyon (Navajo 



M Reference: Pot.t.tvs. Reed C. the cbuoferotts gents stanleya. Llovdia 2: 109-127. 1939. 



