. The American florist : a weekly journal for the trade. Floriculture; Florists. 712 The American Florist. Nov. economically produced, either in the frame or in the greenhouse, than the heading sorts. LETTUCE BEEEDING. In the lettuce breeding work, which has been conducted by G. W. Oliver, un- der the direction of Dr. Galloway, 30 or 40 distinct sorts of lettuce have been crossed and very many interesting forms obtained. A single cross, however, has been made the basis of practically all of the selection work which is now in prog- ress ; namely. Grand Rapids, or Golden Queen, with its reciproc
. The American florist : a weekly journal for the trade. Floriculture; Florists. 712 The American Florist. Nov. economically produced, either in the frame or in the greenhouse, than the heading sorts. LETTUCE BEEEDING. In the lettuce breeding work, which has been conducted by G. W. Oliver, un- der the direction of Dr. Galloway, 30 or 40 distinct sorts of lettuce have been crossed and very many interesting forms obtained. A single cross, however, has been made the basis of practically all of the selection work which is now in prog- ress ; namely. Grand Rapids, or Golden Queen, with its reciprocal cross. One of the interesting features of this work is that in the first generation, while the let- tuce is clearly a cross between the two types, it quite closely resembles one or the other of the parents; the type in the generation is usually very constant, the plants are uniform in character and with veiy decidedly increased vegetative vigor. The marked feature of cross-bred or hybrid plants is their rapid growth. In the second generation hybrid or cross- bred plants break up into all sorts and kinds. Second generation seedlings of the cross above noted have produced as many as 28 distinct types. There are usually two predominating forms but with all possible gradations between them. At the present time Mr. Oliver is working with three or four distinct selections of this cross, representing two general types ; one a vei-y rapid growing, early heading form, producing heads which are very compact and long standing; another fonn of the same cross which is a cutting let- tuce, closely resembling Grand Rap- ids Forcing, but with a more compact and dense habit. These perhaps represent the two extremes from this cross. Both of the lettuces are exceedingly promising. It may be said that the heading form ? which is now in its sixth generation, is the earliest of the- large head types of forcing lettuce. The cutting type is also considerably earlier than either of its parents. Our
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
