Draba. CRUCIFEK.E. 105 



siderably exceediug the calyx aud with a flat patulous entire or emargiuate Ijlade. Stameus 

 6, free aud uuappendaged. Tods witli uearly flat more or less 1-uerved valves; replum uot 

 thickened. Seeds flatteuedj orbicular or elliptic, more or less winged. The section Sisym- 

 biina with obloug wingless seeds and more or less oblique cotyledons. 



Tribe IX. STANLEY^E. Stigma circular in outline or elongated or produced into 

 two lobes lying (except in two or three species of Thelypodlum) transverse to the 

 partition of the ovary, i. e. over the valves of the capsule. Fruit longitudinally 

 2-celled, dehiscent, elongated, terete or prismatic or (in Slreplanthus) compressed 

 parallel to partition or more rarely obeompressed (Stan/ordla). Cotyledons incum- 

 bent or accumbent. Pubescence simple or none (branched in two species of 

 Theli/podium). 



* Cotyledons accumbent ; ovary sessile upon the receptacle ; capsule compressed. 



45. STREPTANTHUS. Sepals ovate or oblong, colored, usually purplish, quite equal at 

 base, or one pair saccate, rarely both. Calyx commonly closed, ovoid, less frequently sub- 

 cylindric, or by the spreading of the tips liecoming somewhat flask-shaped. Petals usually 

 narrow, linear or with a well developed blade and channelled claw. Stamens 6 ; the longer 

 pairs often connate below ; anthers more or less elongated, sagittate at the base. Capsule 

 oblong to narrowly linear. Seeds flat, margined or winged, lieceptacle enlarged. 



* * Cotyledons incumbent, 3-parted ; ovary sessile or nearly so ; capsule obeompressed. 



46. STANFORDIA. Calyx ovoid ; sepals large, ovate, colored. Petals exserted, with 

 broad oblong or lance-oblong claw and narrower crisped blade. Stameus 6, free and uuappen- 

 daged ; anthers linear-oblong, sagittate, straight or moderately curved. Style short ; stigma 

 at first elliptic, entire, later conspicuously 2-lobed. Capsule linear-ol:)long, subchartaceous j 

 valves keeled. Seeds many, biseriate in the cells, wingless. 



* * * Cotyledons incumbent : ovary sessile or raised upon a short thick gyuophore : cap- 

 sule terete, tetragonal, or slightly flattened parallel to the partition. 



47. CAULANTHUS. Calyx of Streptanthus. Petals undulate-crisped with a broad claw 

 and small or olisolete blade. Stamens 6 ; anthers linear, sagittate. Stigma well develoj^ed 

 and commonly distinctly 2-lol)ed, persistent. Capsule somewhat flattened and narrowly 

 linear or subterete ; valves 1-nerved, and often reticulate-veined. 



48. THELYPODIUM. Sepals oblong to linear, rather sliort ; calyx at first cylindric, but 

 often more or less spreading in anthesis. Petals flat, long and narrow or with a well 

 developed blade, white or purplish, rarely yellow. Stamens 6, exserted ; filaments long and 

 slender ; anthers narrowly linear, sagittate at base, curved or coiled. Stigma usually small, 

 often circular in outline, or very .slightly 2-lobed. Pods slender, terete, or quadrangular, 

 often torulose, usually spreading. 



* * * * Cotyledons incumbent : ovary raised upon a slender elongated gynophore. 



49. STANLEYA. Calyx long, cylindric or clavate in bud, spreading in anthesis; sepals 

 linear or spatulate. Petals long and narrow, spatulate, slender-clawed. Stamens 6 ; anthers 

 linear, curved or spirally coiled ; filaments elongated, spreading. Stigma sessile, small, 

 simple. Pods terete or subterete ; valves 1-nerved. Seeds oblong, uniseriate. Flowers in 

 more or less elongated racemes. 



50. WAREA. Calyx short-clavate in bud, spreading in anthesis; sepals short-linear or 

 spatulate. Petals relatively large with broad spreading laminas and slender claws. Stamens 

 6, exserted, spreading ; filaments slender ; anthers very small, curved. Stigma simple. 

 Pods terete, slender, widely spreading. Flowers in very short subcorymbose racemes. 



1. DRABA, Dill. (i\pdf3r], a name of uncertain meaning, applied by Dios- 

 corides to some cruciferous plant.) — Petals entire or emarginate except in 

 § Erophila. Seeds smooth or faintly tuberculate, rarely hispidulous. Pubes- 

 cence usually stellate. A large and widely distributed genus, the larger number 

 of the species arctic or alpine. Many are very variable and the number of species 

 has consequently been greatly multij)lied, especially as in the reduced forms of 



