The Different Forms of Flowers on Plants of the Same Species

by Charles Darwin

Primula vulgaris. Long-styled form, fertilised by own-form pollen during two successive generations : 69 : 0.

Primula auricula. Short-styled form, fertilised by own-form pollen, is said to produce during successive generations offspring in about the following proportions : 25 : 75.

Primula Sinensis. Long-styled form, fertilised by own-form pollen during two successive generations : 52 : 0.

Primula Sinensis. Long-styled form, fertilised by own-form pollen (Hildebrand) : 14 : 3.

Primula Sinensis. Short-styled form, fertilised by own-form pollen: 1 : 24.

Pulmonaria officinalis. Long-styled form, fertilised by own-form pollen : 11 : 0.

Polygonum fagopyrum. Long-styled form, fertilised by own-form pollen : 45 : 4.

Polygonum fagopyrum. Short-styled form, fertilised by own-form pollen : 13 : 20.

TABLE 6.37. Nature of the offspring from illegitimately fertilised trimorphic plants.

Column 1: Species and form. Column 2: Number of long-styled offspring. Column 3: Number of mid-styled offspring. Column 4: Number of short-styled offspring.