Mar. II, 1918 



Sterility in the Strawberry 



617 



type, in which case they set fruit. A few cases have been found in which 

 one side of a flower produced normal stamens and sterile pistils while 

 the other half produced staminodia and set fruit. A similar range of 

 conditions with regard to stamens has been noticed in seedlings of cer- 

 tain cultivated varieties. Figures G and H, Plate 35, are from photo- 

 graphs of primary and secondary flowers of the seedling Minnesota 1017 X 

 Progressive 32-1, both of which bear only staminoids, while I and J repre- 

 sent secondary and tertiary flowers of the same variety, I producing 

 both staminodia and normal anthers and J producing only normal 

 anthers. The production of pistillate flowers on the primary and on 



Fig. 3. — Outline camera-lucida drawings of perfect and intermediate anthers and staminodia of straw- 

 berry: I, 2, and J, Normal anthers from tertiary flowers of a seedling of Minnesota 1017 X Progressive, 

 Progressive, and another seedlingof Minnesota 1017 X Progressive (40-1), respectively. 4, Staminodiuin 

 from a primary flower of Minnesota loi 7 X Progressive (40-1 ). 5 and 6, Normal anthers from Miimesota, 

 3 and a late primary flower of Minnesota loi 7, respectively. 7, Staminodia from a primary flower of Minne- 

 sota 1017 produced early in the spring. 8 and p, Intermediate anthers from primary flowers of Minnesota 

 3. JO, Intermediate anther from a primary flower of Progressive. 11. Staminodia from a pistillate flower 

 cf F.virginiana. J 2. 13, and 1$, Staminodia from pistillate flowers of seedlings of Minnesota 1017 X Pro- 

 gressive, 2-25, 13-40, and i:-59, respectively. 14, A staminodimn from a flower of Haverland.a pistil- 

 late variety. 16, Staminodia from a flower of Crescent, a pistillate variety which produces extremely large 

 and prominent abortive anthers. 



some of the secondary flowers throughout the season seems to be the nor- 

 mal condition in a number of seedlings of the cross 1017 Minnesota X Pro- 

 gressive (fig. 3, 3, 4), while among the commercial varieties there are a 

 number which produce pistillate primary flowers early in the flowering sea- 

 son, while those produced later are all perfect. A few varieties which 

 show this peculiar condition early in the spring, are Brandywine, Minne- 

 sota 3, Bederwood, Tennessee Prolific, and Staples. In figure 3, 6 

 represents an outline drawing of a normal anther from a primary flower 

 of Minnesota 1017, produced late in the season, while 7 represents 

 staminoids of the same variety taken from flowers produced early in the 

 flowering season. 



