6i4 



Journal of Agricultural Research 



Vol. XII, No. lo 



up of two which separate at varying distances from the ground, thus 

 producing two typical cymes from one main stalk. The peduncle and 

 pedicel lengths vary greatly within a variety, but there is apparently a 

 rather constant negative correlation between the two — that is, as the 

 peduncle or primary stalk decreases in length the pedicels or secondary 

 branches increase, resulting in a rather constant ratio between fruit 

 stalk length and leaf petiole length or height of plant. 



Opposite the point of insertion of the small secondary branch is 

 usually a large bract. This may be and usually is in the wild forms 



a monophyllous leaf, while in manv 

 m 01 the cultivated vaneties it may 

 be a well-developed di- or tri-phyl- 

 lous leaf. The bracts or bracteoles 

 subtending the branches of lesser 

 degree are usually only rudimentary 

 structures, being made up of the 

 stipules often much reduced, but 

 with an occasional slight broaden- 

 ing of the midvein to form a small 

 leaf blade. 



The flowers are hypogynous, and 

 typically pentamerous with regard 

 to all parts except the carpels. 

 The perianth consists of three 

 whorls of members, the outer five 

 epicalyx lobes alternating with the 

 five sepals and opposite to the five 

 white petals. 



STAMENS 



Stamen arrangement. — The 

 stamens in typical flowers are ar- 

 ranged in multiples of five. The 

 number is not constant in pure 

 species or within a variety. The 

 stamens are arranged in three 

 whorls. The outer consists of lo 

 parapetalous stamens located at 

 either side of the base of the petals (fig. 2, a, PP). These have long 

 filaments. Their number is the most constant of any of the whorls. The 

 second whorl consists of five antipetalous stamens located opposite the 

 petals and inside of the parapetalous whorl (fig. 2,a,AP). The filaments 

 are shorter than those of the outer and inner whorls. The third whorl 

 consists of five antisepalous stamens inserted opposite the point of inser- 

 tion of the sepals, and inside of the two other whorls (fig. 2, a, AS). 



PR/MARY AXIS 

 P/^IMAfiy FL. 



'SECONDARY 



«7- 



'TE.RTIARY 



43 



Fjg. 1. — Diagram showing the arrangement of 

 flowers of the strawberry and the order of blos- 

 soming. The approximate order of opening is 

 indicated by the figures. 



