Rydberg : Rocky Mountain flora 435 



STANLEYELLA gen. no v. 



Tall branched biennials. Leaves thin, the lower ones lyrately 

 pinnatifid, the upper entire. Sepals thin, petaloid, white, oblong or 

 linear, spreading or even reflexed in anthesis. Petals white, with 

 oblanceolate or spatulate blades gradually tapering into a short 

 claw. Filaments distinct, filiform ; anthers linear, sagittate at the 

 base, soon more or less spirally recurved. Pod slender, terete with 

 short stipe and short style ; stigma small, truncate or nearly so ; 

 cotyledons incumbent and somewhat conduplicate. 



Stanleyella Wrightii (A. Gray) 

 TJiclypodiinn WrigJitii K. Gray. PI. Wright. 1:7. 1852. 



HETEROTHRIX (B. L. Robinson) Rydb., gen. nov. 



TJicIypodiiim § HctcrotJirix B. L. Robinson, Syn. F"l. i' : 178. 



1895. 



Slender biennials, more or less pubescent at least below with 

 stellate or branched hairs. Basal leaves oblanceolate, more or less 

 toothed ; stem-leaves lance-linear or linear, entire. Racemes elon- 

 gated, slender. Calyx more or less oblique, the lower sepals 

 being longer than the upper, all ascending, rather firm and more 

 or less purplish. Petals oblanceolate or spatulate, indistinctly 

 or broadly clawed. Filaments subulate, broad at the base, dis- 

 tinct, scarcely exserted ; anthers linear, sagittate at the base, 

 spirally curved. Pod slender, terete, sessile ; stigma minute, en- 

 tire or slightly lobed, the lobes expanding over the septum ; coty- 

 ledons obliquely incumbent. 



Heterothrix longifolia (Benth.) 

 Strcptanthus longifolius Benth. PI. Hartw. 10. 1839. 

 TJielypoduiin longifolium S. Wats. Bot. King's Expl. 25. 1871. 



Heterothrix micrantha (A. Gray) 

 StrcptantJius viicrantlius A. Gray PI. Fendl. 7. 1849. 

 Thelypodium inicrafithinn S. Wats. Proc. Am. Acad. 17:321. 

 1882. 



CHLOROCRAMBE gen. nov. 



Perennial glabrous herbs ; stem simple at least up to the in- 

 florescence. Racemes lax with slender horizontal or reflexed 

 pedicels. Leaves thin, petioled, with usually hastate blades. 

 Sepals greenish, ascending. Petals greenish-white, with short 

 claws and lanceolate dentate blades. Anthers sagittate at the 



