. Heredity and evolution in plants. Heredity; Plants. EXPERIMENTAL EVOLUTION 113 not by the prolonged selection of fluctuating variations, but at one step—^in one generation—as "sports" of the wild Brassica oleracea. Strawberry plants without run- ners, green dahlias and green roses, the common seedless bananas of the markets, the Shirley poppies, pitcher- leaved ash trees, Pierson's variety of the Boston Fig. 58.—Clover leaves with three to nine leaflets, illustrating a tend- ency to mutate. The normal clover leaf is a pinnately compound leaf with three leaflets. Plants with
. Heredity and evolution in plants. Heredity; Plants. EXPERIMENTAL EVOLUTION 113 not by the prolonged selection of fluctuating variations, but at one step—^in one generation—as "sports" of the wild Brassica oleracea. Strawberry plants without run- ners, green dahlias and green roses, the common seedless bananas of the markets, the Shirley poppies, pitcher- leaved ash trees, Pierson's variety of the Boston Fig. 58.—Clover leaves with three to nine leaflets, illustrating a tend- ency to mutate. The normal clover leaf is a pinnately compound leaf with three leaflets. Plants with leaves having five to nine leaflets con- stitute a "half-race," the normal character is active, the anomaly semi-latent. (Photo by the author; specimens from cultures of G. H. ShuU.) 5-9- "leaved" clovers (Fig. 58), white black-birds (and other albinos, including albino men), moss-roses, thornless cacti and thornless honey-locusts, red sunflowers, com- posites with tubular corollas in the ray-flowers (Fig. 48), and the innumerable white flowered varieties of colored flowered species, are all illustrations of mutation. Fre- quently the mutative change occurs in a lateral bud, pro-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectplants, bookyear1920
