1916.] 



GOODSPEED: TRILLIUM SESSILE 



21 



the normal three-celled ovary of Trillium. Such pistillody of the 

 perianth is an abnormality of much less common occurrence than a 

 similar modification of the stamens. Masters, 1 however, describes and 

 illustrates a case of pistillody of the perianth in Tulipa gesneriana 



Fig. 7. 



(a) Cross-section through a normally produced and matured 

 ovary of Trillium sessile, var. giganteum H. & A. The sec- 

 tion is taken across the top of the ovary, and the ovules are 

 seen attached to the placental surfaces, which have here 

 grown together to form a seemingly axial placenta. Dia- 

 grammatic. 



(b) Cross-section through one of the modified petals of the 

 teratological flower of T. sessile, var. giganteum. Ovules 

 are here found attached, free, along the margins of a peri- 

 anth segment. 



that strikingly resembles the conditions present in this abnormal 

 flower of Trillium. It is to be noted that the ovule-bearing perianth 

 segments of this Trillium showed no evidences of any such further 

 modification of their margins to form stigmatic or stylar surfaces, 



