This section is from the book "The Gardener's Monthly And Horticulturist V26", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
"E. W.," New Albany, Ind., writes: "Last summer we had planted near together in the same bed the double-white Feverfew, Matricaria exima fl. pl., and the Golden Feather Pyrethrum, Parthenium aureum, both of which flowered and produced seed which was saved and sown in the proper season this spring. Among the plants we find quite a number of stronger, taller growth, and greener foliage, evidently crosses, showing how readily the two kinds mix".
[Possibly natural variation and not crossing. Composite plants are unfavorable to cross-fertilization. - Ed. G. M/|