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McGregor : Two new spermatophytes from California 609 



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in the aspect of the plants and the form of the leaves which, for a 

 given type, seem quite distinctive, 



MalacotJirix aracJuioidea is nearest to M, saxatilis^ from which 



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it is to be distinguished as follows : 



M. saxatilis : Green, often woolly on young parts ; leaves 

 obtuse, lower occasionally pinnalifid, auriculate, and partly clasp- 

 ing toward the base ; calyculate scales very numerous ; achenes 

 crowned with a denticulate border. 



M, arachnoidea : Hoary throughout with a dense woolly pubes- 

 cence ; leaves apiculate-acute, apparently never pinnatifid, auricu- 

 late, or clasping; the well-expanded crown of the achene with a 

 merely crenulate border. 



Leland Stanford Junior University, 



