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Articles 26281 - 26282 of 26282
Full-Text Articles in Entire DC Network
The Supposed Dimorphism Of Lithospermum Longiflorum, Charles E. Bessey
The Supposed Dimorphism Of Lithospermum Longiflorum, Charles E. Bessey
Papers in Systematics and Biological Diversity
The plant under consideration is a common herbaceous perennial of the prairies and great plains of North America. In the latter part of April and during the month of May it produces flowers with bright yellow salver-shaped (hypocraterimorphous) corollas, whose tubes are about thirty mm. (one and one-fifth inch) long, and from two to three mm. in diameter. About the first of June, in central Iowa, these large flowers suddenly disappear, and from this time forward until the autumn frosts, they produce only small cleistogamous flowers. The corolla lobes of the latter cohere somewhat, and remain closed, and …
Sensitive Stamens In Portulaca, Charles E. Bessey
Sensitive Stamens In Portulaca, Charles E. Bessey
Papers in Systematics and Biological Diversity
Two years ago my attention was first called to the sensitiveness of the stamens of Portulaca grandiflora, by observing a peculiar motion in them, while a small wild bee was engaged in gathering honey, and perhaps pollen, from the flowers. Upon trial I found that I could, by touching the stamens, make them move through quite considerable arcs of circles. I pursued the investigation somewhat farther at the time, but on account of a pressure of work was compelled to drop it. Last year I again made some examinations which confirmed my previous observations, but declined calling special attention …