THE attractive little petals of the Day-flower unfold but once and endure only for a few hours. That is reason enough for its common name, but there is quite another story woven about its generic title. It seems that Linnaeus knew of three brothers, Dutchmen, named Commelin, who were botanists. Two of the brothers succeeded in publishing the results of their labours, but the third brother was a worthless sort of a chap, and did not pan out so well. The Day-flower, having two large, beautifully developed petals, and one small, insignificant, colourless one, suggested the application of the Hollanders' name, to whom it was dedicated by the great naturalist. The flower is a singular one. The two conspicuous petals are of an exceedingly fine texture and their colour is of the choicest shade of blue - an impressive blue, that one will always remember as being distinctly apart from the general run of floral blues. They do not dry and wither up, as do most petals, but deliberately shrink into a most hopeless, miserable, sticky pulp. The blossom has two large, showy, rounded blue petals that are erect and flaring, earlike, from between three unequal sepals. A third petal, colourless and inconspicuous, forms a very small tongue or lip. Its three perfect stamens are tipped with five-parted petal-like yellow anthers having a cream-coloured centre, and three others are larger and recurved, without the elaborate tips. The smooth, juicy, and much-branched stem is rather weak. It is very slightly zigzagged, and the juice is thick like mucilage. It often takes root at the joints. The long, lance-shaped leaves are contracted at the base into sheathing stems. They alternate on the stalk. The floral one is heart-shaped, clasping and folded together or hooded to guard the short flower stems. The low-growing Day-flower is common throughout its range, in moist, shaded soils, particularly about old farm buildings, neglected gardens, or roadside fences. It is found from New York to Illinois and Michigan, south to Florida, Nebraska and Texas, from June to September. It extends also throughout Central America to Paraguay.