86 PACIFIC SCIENCE, Vol. V, January, 1951 
Fig. 5. Flowers of Cassia fistula from tree B:A, A form with four petals (d missing) and eight stamens (Nos. 6, 
7 missing). B, A slightly irregular form with the common number of stamens, petals, and sepals. C, A form with 
three of five petals much modified; eight stamens (Nos. 1, 8 missing), with anthers borne on two petals (see 
Fig. 6, C). D, A form with three of five petals contorted, one bearing an anther cell; nine stamens, No. 2 missing. 
E, A form with three petals (cand d missing); five sepals; seven stamens (Nos. 3, 4, 6 missing). F, Back view of E. 
