_ On the action of seawater on the germination of seeds._
(_Journ. Linn. Soc._, 1 vol., 1857).
_On the agency of bees in the fertilisation of papilionaceus flowers._
(_Ann. nat. hist._, 2 vol. 1858).
_On the two forms or dimorphic condition of the species of Primula._
(_Journ. Linn. Soc._, 7 vol., 1862).
_On the various contrivances by which British and Foreign Orchids are
fertilised_, 1862.
_On the existence of two forms and their reciprocal sexual relations in
the genus linum._ (_Journ. Linn. Soc._, 1 vol., 1868).
_On the sexual relations of three forms of Lythrum._ (_Journ. Linn.
Soc._, 8 vol., 1864). _On the character and the hybrid-like nature
of the illegitimate offspring of dimorphic and trimorphic Plants._
(_Journ. Linn. Soc._, 10 vol., 1867).
_On the specific difference between_ Primula veris _and_ P. vulgaris
ecc. (Ibidem, 10 vol., 1867).
_Insectivorous Plants_, 1 vol., 1875.
_On the movements and habits of climbing Plants_. (_Journ. Linn. Soc._,
10 vol., 1865).
_The Effects of cross and self fertilization in the vegetal kingdom_,
1876.
_On the different Forms of Flowers on Plants of the same species_, 1877.
_The Power of Movement in Plants_, 1880.