CRUCIFERyE 



151 



with the petiole, midrib, and ascending, incurved, and reticulate 

 venation, purple beneath ; petiole semiterete, channelled above, 

 winged in the younger leaves of the seedling from the blade being 

 decurrent upon them. 



Nos. 1 and 2. Suborbicular or obovate, slightly emarginate, 

 with a gland in the notch. 



Nos. 3 and 4. Obovate, emarginate, glandular in the notch. 



Nos. 5 and 6. Larger and obovate, or tending to be spathulate, 

 and decurrent upon the petiole. 



PIG. IGO.Schizopetalon Walkeri, x 2|. 

 (Early stages in growth of seedling.) 



Cochlearia arctica, Schlecht. 



Hypocotyl erect, terete, glabrous, 1-2 cm. long, light green or 

 colourless. 



Cotyledons obovate or subrotund, fleshy, unequal, emarginate, 

 with very long petioles, glabrous, bright green, very indistinctly 

 trinerved. 



Stem as in the preceding species. 



First leaves with long petioles, subrotund, emarginate, obtuse, 

 cordate at the base, bright green, glabrous, distinctly pinnati- 

 nerved. 



