142 < Kl < II KK.E. 



length elongated, ebracteate. Corolla white, rarely rose- 

 color or purplish. 



Etymology. An old name, said by Linnaeus to be derived from the 

 country, Arabia. 



Geographical Distribution. A genus of over seventy species, widely 

 scattered over the northern temperate zone, and partly subarctic or alpine. 



Note. The arrangement of the species is not yet well settled. The 

 North American A. Canadensis and A. laevigata, with the Siberian A. pen- 

 dula (Sect. Catolobus, C. A. Meyer, or Lomaspora, DC. excl. sp.), have 

 winged seeds, with their funiculi partly adnate to the partition, the elongat- 

 ed areolae of which are bounded by exceedingly tortuous lines (just as in 

 Plate 59, fig. 6), the petals small, the style very short or none, and the 

 ovules biseriate in each cell ; and certainly ought not to be separated from 

 Turritis. 



PLATE 58. Arabis patens, Sulliv. ; — of the natural size (the stem 

 shortened) ; from Ohio, Sullivant. 

 1. A lateral sepal ; and 2, a petal; enlarged. 



3. Stamens and pistil, enlarged. 



4. A ripe silique, of the natural size. 



5. Same, cut across, near the base, and magnified. 



6. The replum, from the upper part, with the seeds, magnified , two of 



the seeds transversely divided, showing the accumbent cotyledons. 



7. Tissue from the partition, highly magnified. 



8. A magnified seed of A. Canadensis, Linn., transversely divided. 



