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.
An address on "Variations in Nature,"read by Mr. Meehan before the American Association for the Advancement of Science, Montreal, has been published, and contains many interesting facts in reference to this subject. After briefly discussing Darwin's views he gives the following example of variation:-" Near my home in south-eastern Pennsylvania we find the common Virginia Creeper, Ampelopsis quinquefolia, with five leaflets. In Texas, Mr. Buckley finds it with seven, in northern Pennsylvania it is found sometimes with three. Along the Canadian line it is mostly with five, but sometimes with seven. In south-eastern Pennsylvania the leaflets are usually broadly ovate, slightly serrate, dark green, and the flowers and fruit are borne on rather stout pedicels. In Colorado the leaflets are rather wedge-shaped, deeply laciniate, of a somewhat glaucous green, and the pedicels slender. In south-eastern Pennsylvania the secondary veins are delicate, curved, and diverging from each other as they extend towards the edge of the leaflet; along the shores of Lakes Erie and Ontario, especially on Goat Island, near Niagara, the veins are very prominent, straight, almost parallel, and give the appearance at first sight of Horse-Chestnut leaves.
We do not regard these outlying forms as species, we do not even consider them as varieties. But why? Merely because we find in what I will call the central form a tendency to all the characters referred to. If this central one were to disappear, I think botanists would have no difficulty in regarding the outlying forms as well-marked varieties, if not good species." - London Journal of Horticulture.