1. Britten, J. (1865). “On white-flowered varieties of British plants.”Journ. Bot. iii, 335.
2. — (1863). “Botanical Notes.”The Phytologist, New Series, vi, 591.
3. — (1903). “Ranunculusbulbosus sulphurous.”Journ. Bot. xli, 294.
4. Masters, M. T. (1867). “Note on double flowers ofRanunculus ficaria, etc.”Ibid. v, 158.
5. Parkin, J. (1928). “The glossy petal ofRanunculus.”Ann. Bot. xlii, 739.