SPECIES CROSSES IN THE GENUS NICOTIANA. 211 



Aa. — A form closely similar to the above having rather 

 larger and more distinctly lobed flowers. From seed ripened 

 the previous summer at Cambridge. This form also bred true. 



B. — ^This variety was received from Upsala under the name 

 N. commutata (= N. langsdorfii, var. grandiflora, Comes). 

 Rather small plants with small leaves and rather larger flowers 

 than the last variety. Corolla, pale-yellow in colour, bulged 

 and clearly lobed. Pollen white. This also came quite true 

 to seed. 



C. — Received from Budapesth with the name N. viscosa. 

 Is possibly a cross between N. langsdorfii and N. viscosa. 

 Corolla large, funnel-shaped. Some plants had white flowers 

 and others yellow, and the pollen of some was white and that 

 of others pale-blue. Otherwise this variety closely resembled 

 the typical N. langsdorfii in growth and habit. A plant which 

 had white flowers and pollen came true to seed. 



D. — This form was received from Kolozsvar as N. viscosa, 

 but in all visible characters it appeared to be a variety of N. 

 langsdorfii with large lobed flowers. The flower were still 

 larger and more deeply lobed than those of Aa. Corolla yellow , 

 throat bulged, pollen blue. Self -fertilized seed from one of 

 these plants yielded 7 plants with balged and 2 with funnel- 

 shaped corollas. It seems therefore quite possible that the 

 original plants may be the result of a cross similar to that 

 which is suggested as the origin of C. 



E. — A plant which made its appearance as a solitary indi- 

 vidual in a rcw of plants similar to Aa may be provisionally 

 designated as a variety of N. langsdorfii. The plant was of 

 a dwarf habit, the foliage that of N. langsdorfii on a small 

 scale, and the inflorescence similar, but condensed and crowded. 

 The flowers were markedly funnel-shaped, but distinct m shape 

 from those of C; white inside, the outside of the corolla 

 slightly veined with purple. The stamens were very short — 

 not half the length of the style, pollen white. No seed was 

 produced by this plant, but its pollen gave good seed when 

 applied to several of the above varieties of N. langsdorfii. 



The results of crosses between the above-mentioned varieties 

 will first be recorded in tabular form under the heads of the 

 several characters involved. 



7(1)09 (28) 



