The Morphology of the Ovule and Female Flower of 
Juglans regia and of a few allied Genera. 
BY 
M. BENSON, D.Sc., F.E.S. 
AND 
E. J. WELSFORD, F.L.S. 
With eight Figures in the Text. 
T HE morphology of the walnut was worked out by Van Tieghem as 
long ago as 1869 but his results were unfortunately published without 
any figures. 1 In 1905 appeared an account by Nicoloff, 2 differing in many 
important points from that of Van Tieghem. Numerous figures were given 
but they do not demonstrate the points on which he differs from Van Tieghem. 
We determined therefore to investigate this problem and can now state that 
our results confirm in all particulars those of Van Tieghem. Nicoloff, 
though ostensibly working out the placentation of the ovule, has not once 
figured the dorsal bundles of the carpellary leaves. He insists that the 
placental bundles are a direct continuation of those of the stem but does 
not figure them in continuity with the bundles of the stem. We have been 
able to show that they are part of the carpellary leaf- traces and that hence 
the ovule is appendicular. 
Those who wish to clearly understand the structure should consult Van 
Tieghem’s paper. We only propose to state so much of our results as will 
render the diagrams intelligible and bring the facts elicited by Van Tieghem 
and others into relation with more modern views on the nature of the Angio- 
spermic flower. 
Juglans regia. 
The female flower of Juglans regia is generally composed of 2-3 
carpels surrounded by four green 4 perianth ’ leaves, distichously arranged, 
and a cupule constructed probably of the subtending bract and two lateral 
bracteoles. All these nine leaves are connate in such a way that only their 
1 Van Tieghem, Anatomie de la fleur femelle du noyer. Bull. Soc. Bot., t. xvi, p. 412. 
2 Nicoloff, Sur le type floral etc. des Juglandees. Journ, de Bot., t. xxviii, xxix. 
[Annals of Botany, Vol. XXIII. No. XCII, October, 1909.] 
