VARIATION AND CORRELATION IN 
THE INFLORESCENCE OF MANFREDA VIRGINICA 
J. ARTHUR HARRIS 
Head, Department of Botany, University of Minnesota 
Formerly Botanical Assistant, Missouri Botanical Garden 
I. INTRODUCTION 
The purpose of this paper, which is one of a series on the general 
problem of the physiology of fertility in plants, is to present the 
results of а biometrie study of variation and correlation in the 
inflorescences of Manfreda virginica. 
This study was planned, the materials collected, and practically 
all the tabulations made at the Missouri Botanical Garden in 1906 
апа 1907.1. The calculations were, in large part, carried out in 
the Biometric Laboratory at University College, London, in 1908. 
The long delay in completing the manuscript for publication has 
been in part due to pressure of other work and in part to an effort 
to secure formulae to deal more effectively with certain phases of 
the problem. 
The points to be especially considered are:— 
1. The variability and correlation of the same species when 
growing in different habitats. 
2. Тһе correlation between the number of flowers produced and 
the number of capsules developing, and between the number of 
flowers and capsules produced and the number of seeds developing. 
3. The relationship between position of the flower on the inflor- 
escenee and fruit production. 
4. The correlation between position of the flower on the in- 
florescence and the number of seeds per locule and per fruit. . 
5. The correlation between the position of the fruit on the 
inflorescence and the number of seeds per locule and per fruit. 
6. Тһе correlation between the number of seeds in the 3 loc- 
ules of the fruit. 
1 The initial stages of the work were aided by a grant from the American As- 
Sociation for the Advancement of Science. 
Ann. Mo. Bor. Garb., Vor. 11, 1924 (411) 
