BIRTMWORT FAMILY. Aristolochiaceas. 



BIRTHWORT FAMILY. AristolocJiiacece. 



A small family of twining or low herbs, having per= 

 feet flowers— with six or more stamens and a pistil. The 

 leaves stemmed, and either alternate or proceeding from 

 the root. The flower-cup or calyx, without petals, 

 united with the ovary or fruit receptacle, and lobed or 

 irregular. Assisted in the process of fertilization by 

 various smaller insects. 



The two long-stemmed deep green veiny 

 inger jg^ygg gQf^ woolly, and heart-shaped, their 

 Canadense Stems hairy ; the flower with three dis- 



Brown=purple tinct pointed brownish or madder purple 

 April-May divisions to the calyx which is closely 

 united to the solid seed receptacle or ovary, green out- 

 side ; the cup white below marked by a hexagon in pur- 

 ple-brown. A curious woodland plant whose odd flower 

 is half concealed by its low position and its sober color 

 which not infrequently resembles the leaf-mould just 

 beneath it. Its proximitj^ to the ground and the fre- 

 quent visits of the fungus gnats and the early flesh-flies 

 suggest that these have most to do with the fertilization 

 of the plant. 6-12 inches high. Common in rich woods 

 from Me., south to N. Car., west to Mo. and Kan. 

 Asarum ^ southern species with evergreen leaves 



arifoUum arrow-heart-shaped, and urn-shaped flow- 



Green=purple ers dull green outside, dull purple-brown 

 April-June inside, with three short blunt lobes. One 

 leaf only put forth each year. In woods from Va. , south 

 to Tenn., Ala., and Fla. 



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