360 University of California. Publications in Agricultural Sciences [Vol. 2 



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Fig. 1. Somatic metnphase figures from root tips of: a, T. ohtusiflorum ; h, T. 

 majus; c, T. wormskjoldii; d, T. variegatum ; e, T. microcephahim ; f, T. fucatum ; 

 to the left a plate with 1(5 chromosomes, to the right a satellited pair from 

 another plate; g, T.viresernf;; h, T. alhopurpureum ; i, T. eiliolatinn : /,-, T. dichoto- 

 mutn; I, T. rcflexum. All drawings for this paper were made with tlie aid of a 

 camera lucida with a Zeiss 18 compensating ocular and a Leitz apochromatic 

 2 mm. objective, N.A. 1.3; magnification Sfi.lO; figures not reduced; sections 

 7fi, stained with Ilaidenliain 's haematoxylin. 



