SPECIES OF TUBER-BEARING SOLANUMS. 451 
that Solanum eluberosum is а primitive specific form, since it agrees in this 
respect with admittedly wild species of tuber-bearing Solanums. Moreover, 
in the great variability of its seedlings it closely resembles the cultivated 
potato. These facts, I think, point to the conclusion that Lindley’s Solanum 
etuberosum may probably be the parent form of the cultivated potato of 
to-day. ] ARTHUR W. SUTTON. 
ENPLANATION OF THE PLATES. 
The figures on the Plates were all drawn from specimens growing in the 
Reading Trial Grounds. 
PLATE 38. 
Solanum Maglia, Schlecht. 
A. Intlorescence and upper leaves, 3. E. Flower section, x 2, showing cleft 
B. Flower showing anthers, x 2. stigma. 
C. Flower showing calyx, x 2. F, б, Н. Cymes with flowers removed, 3. 
D. Flower, side view X 2, showing cleft J. Largest leaf on examples examined, >. 
stigma, K. Pollen, x 300. 
PLATE 39. 
Solanum Commersonii, Dun. (White-flowered form.) 
A. Inflorescence and upper leaves, large F. Pollen, x 200. 
lower leaf behind, 2. б. Self-fertilized berries, 3. 
B. Cymes with flowers removed, 3. H. Seed, x 2. 
C. Flower-bud, x 2. J. Cross-fertilized berries, 3. 
D. Hairs from tips of petals, x 50. K. Sections of do., 1. 
E. Hairs from limb of corolla, x 50. L. Seed, x 2. 
PLATE 40. 
“ Solanum Conmmersonii * Violet, " Labergerie. 
A. Inflorescence and upper leaves, large | Е. Pollen, x 300. 
lower leaf behind, 3. F. Berry, 3. 
B. Cyme with flowers removed, 3. G. Section of berry, 1. 
C. Hairs from tips of petals, x 50. H. Seed, x 2. 
D. Hairs from limb of corolla, x 50. 
PLATE 41. 
Paulsen’s “ Blue Giant " Potato. 
A. Inflorescence and upper leaves, large E. Pollen, x 300. 
lower leaf behind, 1. F. Berry, 3. 
B. Cyme with flowers removed, 3. G. Section of berry, 4. 
C. Hairs from tips of petals, x 50. H. Seed, x 2. 
D. Hairs from limb of corolla, x 50. 
