SPECIES OF TUBER-BEARING SOLANUMS. 453 
PLATE 47. 
Solanum etuberosum, Lindl. (White-flowered Seedling.) 
А. Inflorescence and upper leaves, large = D. Flower, side view, X 2. 
lower leaf behind, 3. | Е. Flower section, x 2. 
B. Flower showing anthers, x 2. Е. Cyme, with flowers removed, 3, 
C. Flower showing calyx, x 2. G. Pollen, x 300. 
PLATE 48. 
Solanum etuberosum, Lindl. (Lilac-flowered Seedling.) 
A. Inflorescence and upper leaves, 3. | Е. Flower section, x 2. 
B. Flower showing anthers, x 2. F, G, Н. Cymes with flowers removed, 3. 
C. Flower showing calyx, x 2. | J. Pollen, x 300. 
D. Flower, side view, x 2. 
PLATE 49. 
POLLEN OF VARIOUS SPECIES OF Solanum. 
А, В, C. Figures representing t.e pollen-grains of Solanum verrucosum, Solanum 
polyadenium, and Solanum tuberosum respectively, each x 300. Although 
varying somewhat in size, the form in each case is regular and elliptical, and 
is typical of the pollen-grains of all the wild types I have examined. 
D, E, F. Representing the pollen-grains of the cultivated potatoes ** Up to Date," * Main- 
crop,” and “ Discovery " respectively, each x 300. There is little if any 
difference in the size of these three groups of pollen-grains, and in each case 
the form is irregular and polygonal, and thus typical of the pollen of all the 
cultivated potatoes I have examined. 
G. Pollen-grains of Solanum etuberosum, X 300. 
H. Pollen-grains of a seedling plant bearing white flowers raised from a berry 
produced in 1906. The form of pollen-graius still remains regular and 
elliptical. х 300. 
I. Pollen-grains of a seedling plant bearing white flowers raised from a berry 
produced in 1907. The form of pollen-grains still remains regular and 
elliptical. x 300. 
J, K, L. Pollen-grains of three seedling plants raised from berries produced in 1907, each 
bearing lilac flowers, The form of pollen-grains in each case is irregular and 
polygonal, corresponding to that of the cultivated potatoes, x 300. 
In each case all pollen-grains shown in I, J, K, and L, the flowers had been artificially 
selfed under controlled conditions, 
The seedling plants which gave the pollen-grains shown in I and J were raised from the 
same seed-berry. 
N.B.—The figures of pollen-grains on this Plate, and those also shown on previous 
Plates, were drawn when the pollen-grains were dry. 
