This section is from the book "Who's Who Among The Wild Flowers", by W. I. Beecroft. Also available from Amazon: A Field Guide to Edible Wild Plants.
Uvularia grandiflora. Lily Family. Apr. - June.
Found in rich woods. Western New England to Minnesota and Kansas, south to Georgia.
Larger and more irregular than those of the preceding, pale or greenish yellow, inner surface smooth.
Leaves appear as if perforated by the plant stem.

Large-flowered Bellwort.
U. perfoliata. Resembles the preceding but may be distinguished by the rough inner surface of the flower. Found from Massachusetts to Ontario, Dakota, and southwest.

Bellwort.
 
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