Calystegia Sepium Seed
An illustration of a Calystegia sepium seed cut lengthwise showing the embryo. Calystegia sepium (Larger Bindweed, Hedge Bindweed, or Rutland beauty) is a species of bindweed, with a subcosmopolitan distribution throughout temperate Northern Hemisphere in Europe, Asia, northwestern Africa, and North America, and in the temperate Southern Hemisphere in Australia, and Argentina in South America.
Encyclopaedia Britannica (11th ed., vol. 7) (New York, NY: The Encyclopaedia Britannica Company, 1910)