M E 



tliofe wliich contain anthera, but no Jiigmct. 

 Sierilis of Tournefort; Paleaceus of Ray ; Ab- 

 ortiens of others. 



MEDULLA \_MviXo',, marrow] The pith or 

 heart of the tree or plant ; according to Lin- 

 naeus in his Phil. Botan. one of the four confti • 

 tuent parts of the Radix, in which term he 

 comprehends the ftem with what is commonly 

 underftood to be the root : the other three parts 

 are iigmm, liber, & cortex, which fee. 



MEMBRANACEUM Foliurn l7nenihra7za, a 

 membrane] a term regarding the fubftance of 

 leaves ; having no diftinguifhable pulp between 

 the two furfaces. 



Memhranacea Siipula, a thin paleaceous mem- 

 brane, as in the Arenaria rubra. 



MEMBRANATUS Caidis, covered with 

 thin membranes. 



MENSURA, meafure. Plants are generally 

 fo various in their dimenfions, that their parts 

 can only be meafured relatively to "each other ; 

 Tournefort however introduced pofitive geo- 

 metrical menfuration ; but Linnjeus, thinking 

 it inconvenient for a botanift to carry an artifi- 

 cial fcale in his pocket, makes a natural fcale 



of 



