448 МВ. А. W. SUTTON ОХ WILD FORMS AND 
between Plates 40 and 41 will show the complete similarity which exists 
between the pollen-grains of the supposed sport and Paulsen’s “ Blue Giant,” 
and also between the seed-berries of these two. A comparison of the hairs of 
the tips of the petals on Plates 39, 40, and 41 is also suggestive. It will 
also be seen on comparing Plates 48 and 44, that the tubers of the supposed 
sport and Paulsen's “ Blue Giant” correspond in all respects. 
Besides Solanum Maglia and Solanum Commersonii, I have had the fol- 
lowing wild species under observation and experiment at Reading :— 
1. Two distinct forms of Solanum tuberosum sent me by Mr. Stuart, of the 
Vermont Experiment Station, U.S.A. One of them, collected in Mexico, 
Mr. Stuart considered to be a practically unaltered ancestral form of Solanum 
tuberosum. 
(Plate 45. Solanum tuberosum, Linn., var.)—The chief points of interest in 
this plate are :— 
(a) The regular and elliptical form of pollen-grains. 
(b) The wheel-shaped corolla, in contrast with the star-shaped corolla of 
Solanum Commersonii (Plate 39). This wheel-shaped corolla is 
also seen in Solanum Maglia (Plate 38), in Solanum etuberosum 
(Plate 46), and almost universally in the cultivated potatoes. 
(c) The round form of the seed-berry, in contrast with the cordiform 
seed-berries of Solanum Commersonii (Plate 39). 
2. Solanum polyadenium, Greenman, also from Mr. Stuart. This species 
is one of the most distinct of all wild tuber-bearing Solanums with which I 
am acquainted, the leaves and stems being covered with a dense coat of hairs, 
and emitting a strong scent somewhat resembling that of Feverfew, Pyrethrum 
Parthenium, Sm. 
3. Solanum verrucosum, Schlecht. 
4, Solunum tuberosum, var. boreale (= Solanum fendleri, А. Gray), from 
Arizona. 
The latter was sent to me by the Rey. J. Aikman Paton, of Castle 
Kennedy, N.B. 
5. Solanum etuberosum, Lindley. (Plate 46.) 
All the five last mentioned wild species, except Solanum etuberosum, flower 
freely, and produce fruits containing an abundance of seeds, The plants 
raised from seed of these wild species (excepting only Solanum etuberosum) 
exhibit no variation whatever from the parents or among themselves, even 
when the seeds are taken from plants allowed to flower in close proximity to 
