504 MR. J. G. BAKER ON THE 
specimens :—Tubers not above the size of small marbles. Stems 
not above a span long, simple or branched, subglabrous or hairy. 
Fully-developed leaf 2-3 in. long, including the 3-1 in. petiole; 
leaflets 5-9, oblong-lanceolate, acute, without any interspersed 
small ones ; end leaflet 1-13 in. long; side ones petioled, 1-3 in. 
broad, unequally rounded at the base. Cymes few-flowered ; 
pedicels short, finely pilose. Flower-calyx 4 in. long; teeth 
deltoid, equalling the tube. Corolla white, 2 in. diam. ; segments 
lanceolate-deltoid, as long as the tube. Anthers bright yellow, 
% in. long. Style much exserted. Berry globose. It is a native 
of the mountains of Colorado, New Mexico, and Arizona, and we 
have the same plant from Mexico gathered by Bourgeau at Mont 
Zacoalco, near Guadeloupe, No. 544 of his collection as distri- 
buted. A full account of the discovery in Arizona of this and 
the last, and of the kind of stations in which they grow, will be 
found in a paper called * The Discovery of the Potato in Arizona,” 
by Mr. J. G. Lemmon, of Oakland, in California, which was read 
before the Californian Academy of Sciences at San Francisco on 
Jan. 15, 1883, and published as a pamphlet by Messrs. Bacon 
and Co., 508 Clay Street, San Francisco. 
SYSTEMATIC SUMMARY. 
So far as I can judge from the material and information which 
we possess in England, out of twenty species which have been 
named, six, viz. S. tuberosum, S. Maglia, S. Commersoni, S. cardio- 
phyllum, S. Jamesii, and S. oxycarpum, possess a fair claim to be 
considered as distinct species in a broad sense ; and of the others 
eleven, viz. S. etuberosum, S. Fernandezianum, S. immite, S. colom- 
bianum, S. Otites, S. Valenzuele, S. verrucosum, S. debile, S. stolo- 
niferum, S. utile, S. squamulosum, and S. Fendleri, are certainly, 
or probably, mere forms or varieties of S. tuberosum, and Ñ. 
Ohrondii and S. collinum of S. Commersoni. The following are 
brief diagnoses of the species, as I understand them, with their 
habitats :— 
l. SOLANUM TUBEROSUM, L.: tuberibus magnis, caule valido, 
folis breviter petiolatis, foliolis multijugis ovatis vel oblongis 
acutis multis minutis interjectis, corolle lilacine vel albe seg- 
mentis brevibus deltoideis, fructu sæpissime globoso, stylo brevi 
vel elongato .—Amndes of Chili, Peru, Bolivia, Ecuador, and 
Colombia; also in the mountains of Costa Rica, Mexico, and 
the South-western United States. 
