. Contributions from the Laboratory of Plant Genetics. GENETICS OF FRAGARIA 311 F. grandiflora Ehr. Common garden strawberry. Believed to have originated from crosses between F. virginiana and F. chiloensis. Extremely variable, some forms leaning toward virginiana, some toward chiloensis. In most characters more or less intermediate, but in size of plant, flower and fruit surpassing that of either in our specimens. Flowers often with supernumerary petals. A number of cultivated varieties have been kept under observation. Species from other genera used In addition to the Fragaria species enumer
. Contributions from the Laboratory of Plant Genetics. GENETICS OF FRAGARIA 311 F. grandiflora Ehr. Common garden strawberry. Believed to have originated from crosses between F. virginiana and F. chiloensis. Extremely variable, some forms leaning toward virginiana, some toward chiloensis. In most characters more or less intermediate, but in size of plant, flower and fruit surpassing that of either in our specimens. Flowers often with supernumerary petals. A number of cultivated varieties have been kept under observation. Species from other genera used In addition to the Fragaria species enumerated the following two forms have been used in crosses: Duchesnea indica Andr. Mock or Indian strawberry. Petioles low, spreading; leaves trifoliate, dark green; runners bearing leaves and one- flowered peduncles; petals yellow; bractlets large and dentate at tips; fruit spherical, bright red, watery and insipid; achenes very prominent. Introduced from Northern India. Chromosome counts by Ichijima show 42 Figure 3.—28-chromosome species. At left, F. virginiana, at right, F. chiloensis. Potentilla nepalensis hybrid. Horticultural variety Miss Willmott. Plant erect, branching; leaves 5-foliate clothed with long, soft spreading hairs; petals, stamens and pistils rose colored to dark red; pollen bright yellow; receptacle dry and hairy when mature; achenes small. Introduced from the Himalayas. Chromosome number undetermined. TECHNIQUE USED IN MAKING CROSSES Emasculation, though tedious because of the large number of anthers, is not difficult. A pair of straight dissecting forceps, the tips of which had been ground down to a fine point, have proved to be best suited to the purpose. At the beginning of the investigation the buds were emasculated Genetics 12: Jl 1927. 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
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