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Vol. 4. p. 737. "D^r T. Bell Salter on fertility of certain Hybrids"

p. 738. quotes from Prof. Bell that with hens, domestic goose & swan-goose (Cygnus Guineensis) readily bred together. The male & female hybrids bred readily with the pure parents, but not with each other.

D^r S. suspected with an opinion once held by Sir J. E. Smart that Epilobium roseum was hybrid between E. montanum & E. tetragonum: latter was impregnated ten years ago by pollen of E. montanum & the plants produced were intermediate, but not like E. roseum: for 4 successive generations raised plants from Hybrid seed, & since then,i e for 4 years more continued to come up in garden.

October 1852. — & now in letter he speaks of them continuing to come up. — 2 out of the whole very large number of hybrids were abnormal types with a stronger resemblance toone parent, — with similar slight exceptions keep same characters to present day. — He also made reciprocal cross but hybrids were similar. —

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p 739. Genera rivela was fertilised by pollen of G. urbarum. (Gaertner treid reverse) The hybrids identical with G. intermidious of Ehrbach, & as found in Scotland. — same result in every respect as in Equilolium & to this day continues to propagate in garden. (Q) The wild hybrid Leurs preartis same

He tried many times to make bybrid difference as artificial hybrid. [illeg] Linaria repens & vusariis & between Sesopharlerlia mados & aguestica, but always quite failed, plants yielding no seed.—

No had has ever doubted the specific difference of the two Lemnas & Equilibriums.—

(Even if slightly fewer number of seeds I do not see that this slightly lessened fertility is very important.

Reference:

Salter, T. Bell. 1852. On the fertility of certain hybrids. Phytologist 4: 737-742.