This section is from the book "The Gardener's Monthly And Horticulturist V23", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Mr.Thomas Meehan, before the Academy of Natural Sciences, remarked that the point he made recently in regard to Drabaverna, that mere light alone evidently failed to account for the special opening time of flowers, was confirmed by some recent observations on Talinum teretifolium. When preparing the chapter on this plant for his "Native Flowers and Ferns of the United States," a few years ago, he had watched plants almost daily through the whole season, and found that without any exception they opened at 1 P. M. and closed at 2. This season he had watched them again, and found that though the time of opening was the same, 1 P. M., they never on any occasion noted, cloved at 2, but continued sometimes to half past three, half-past four, and on one occasion were found closing at half past five. Mr. Meehan said he had endeavored to associate these variations with some atmospheric changes, such as heat, light and moisture, but in no case did these endeavors prove satisfactory. In the " Proceedings of the Kansas Academy of Sciences" on the table, Professor Smyth had contributed materials for a " floral clock" for Kansas, and Talinum teretifolium was set down in the list as opening at 11 A. M. in that State. Mr. Meehan believed that the laws influencing this particular class of motion in flowers were completely hidden from us, and that the subject offered an inviting field to the biologist.
Mr. Redfield suggested that perhaps the age of the plants made some difference in their habits.
Mr. Meehan replied that the patch in his garden was much larger now than at first, from addition through self-sown seeds, but all the plants behaved precisely alike. He did not suppose that external circumstances had no influence, but that the condition of the living material on which they acted, decided the final character, and that Mr. Red field's question was in the right line.