OXALIS. 



XXI. THE YELLOW WOOD SORREL. 



Description. The Yellow Wood Sorrel, with clover- 

 like leaves, is almost ubiquitous. It blossoms from May to 

 September, in open places, from the Great Lakes to the 

 Gulf, and even to the Pacific Ocean. There are other plants 



FIG. XXI. Oxalis stricta : 1, plan of the flower ; 2, vertical section of flower. 



of its kind more beautiful, but none more instructive nor 

 so generally within the reach of the botanical student. 



Analysis. THE LEAF REGION. From perennial creep- 

 ers under ground, or from the seed, a slender stem arises, 

 simple and erect at first, but soon branching and reclining. 



