FLOWERING PLANTS AND FERNS OF ARIZONA 343 



1. Pennellia micrantha (A. Gray) Nieuwland, Amer. Midland Nat. 5: 

 224. 1918. 



Strepianthus micranthus A. Gray, Amer. Acad. Arts and Sci. 



Mem. ser. 2, 4: 7. 1849. 

 Heterothrix micrantha Rydb., Torrey Bot. Club Bui. 34: 435. 



1907. 



Graham, Cochise, and Pima Counties, 3,000 to 6,500 feet, often 

 among bushes, July to September. Colorado and Utah to Mexico. 



5. LAMPROPHRAGMA 



Sepals and petals purple, the petals 4 to 5 mm. long; pods becoming 

 strongly reflexed. Otherwise much like Pennellia and doubtfully 

 distinct as a genus. 



1. Lamprophragma longifolium (Benth.) O. E. Schulz, Pflanzenreich 

 IV. 105: 299. 1924. 



Streptanthus longifolius Benth., PL Hartw. 10. 1839. 

 Heterothrix longifolia Rydb., Torrey Bot. Club Bui. 34:435. 

 1907. 



Apache County to Coconino County, south to Cochise and Pima 

 Counties, 5,500 to 9,000 feet, dry pine forests, July to September. 

 New Mexico, Arizona, and Mexico. 



6. CAULANTHUS «° 



Plants herbaceous, annual or perennial; herbage glabrous or nearly 

 so; stem leaves sessile or short-petioled ; stems either slender and 

 flexuous, or stout, straight, and more or less inflated; calyx somewhat 

 flask-shaped, closed at anthesis or nearly so, glabrous or pubescent; 

 petals whitish or purplish, with channeled, crisped, or cucullate blades 

 little wider than the claws; pods elongate, erect or reflexed, terete or, 

 if flattened, then not more than 3 mm. wide. 



Key to the species 



1. Stems slender, flexuous, not inflated; stem leaves auriculate at base; calyx 

 glabrous; petals ochroleucous, sometimes purple- veined; style evident, at 

 least 1 mm. long at maturity of the pod; stigma entire or shallowly lobed; 

 pods reflexed, 2 to 5 cm. long, appearing somewhat flattened in immature 

 specimens 1. C. cooperi. 



1. Stems stout, often inflated; stem leaves not auriculate; calyx usually pubescent; 

 petals (and often the sepals) purple or purplish; style none; stigma deeply 

 lobed; pods erect or strongly ascending, somewhat rigid. 



2. C. CRASSICAULIS. 



1. Caulanthus cooperi (S. Wats.) Payson, Mo. Bot. Gard. Ann. 9: 293. 

 1922. 



Thelypodium cooperi S. Wats., Amer. Acad. Arts and Sci. Proc. 

 12: 246. 1877. 



Kingman and Chloride to the Colorado River (Mohave County), 

 3,500 feet or lower, March to April. Western Arizona, southern 

 Nevada, and southern California. 



This plant seems out of place in the genus Caulanthus. It resembles 

 Streptanthella longirostris but differs in having the leaves auriculate at 



49 Reference: Payson, E.B. a monographic study of thelypodum and its immediate allies. Mo. 

 Bot. Gard. Ann. 9: 233-324. 1922. (Caulanthus, pp. 283-309.) 



