Crossword clues for drosera
The Collaborative International Dictionary
Drosera \Dros"e*ra\ (dr[o^]s"[-e]*r[.a]), n. [NL., fr. Gr.
drosero`s dewy.] (Bot.)
A genus of low perennial or biennial plants, the leaves of
which are beset with gland-tipped bristles. See Sundew.
--Gray.
Wiktionary
n. Any of several carnivorous, flowering plants of the genus ''Drosera''.
Wikipedia
Drosera, commonly known as the sundews, is one of the largest genera of carnivorous plants, with at least 194 species. These members of the family Droseraceae lure, capture, and digest insects using stalked mucilaginous glands covering their leaf surfaces. The insects are used to supplement the poor mineral nutrition of the soil in which the plants grow. Various species, which vary greatly in size and form, can be found growing natively on every continent except Antarctica.
Both the botanical name (from the Greek δρόσος: drosos = "dew, dewdrops") and the English common name (sundew, derived from Latin ros solis, meaning "dew of the sun") refer to the glistening drops of mucilage at the tip of each tentacle that resemble drops of morning dew.
In Greek mythology, Drosera was a naiad. She was one of the three ancestors of the Tyrians, along with Callirrhoe and Abarbarea.
Drosera may refer to:
- The plant genus Drosera
- Opensource orienteering management system Drosera (orienteering)
- Drosera (naiad), a nymph from Greek mythology.
Drosera is open source orienteering competition management software, which is part of orienteering toolbox. It is written as Java EE server with web interface and REST API for communication with other programs. It is build to use electronic punching system such as SPORTIdent.
As of the software is still in beta stage, but it has been used in managing several live competitions.
Usage examples of "drosera".
The parent form of Dionaea and Aldrovanda seems to have been closely allied to Drosera, and to have had rounded leaves, supported on distinct footstalks, and furnished with tentacles all round the circumference, with other tentacles and sessile glands on the upper surface.
Yet the cells of the glands of Drosera are thus excited to transmit a motor impulse to a distant point, inducing movement.
As so many experiments were tried on the digestive power of Drosera, only a few were made with Dionaea, but they were amply sufficient to prove that it digests, This plant, moreover, is not so well fitted as Drosera for observation, as the process goes on within the closed lobes.
In this respect Dionaea differs from Drosera, which catches and digests many insects after shorter intervals of time.
Drosera, on the other hand, lives chiefly on insects which are good flyers, especially Diptera, caught by the aid of its viscid secretion.
Again, fibrocartilage, though not properly dissolved, is acted on in the same manner, both by the secretion of Drosera and gastric juice.
At one time I felt convinced that morphia acted as a narcotic on Drosera, but after having found in what a singular manner immersion in certain nonpoisonous salts and acids prevents the subsequent action of phosphate of ammonia, whereas other solutions have no such power, my first conviction seems very doubtful.
The most interesting case for us is that of the two species of Saxifraga, as this genus is distantly allied to Drosera.
In Drosera the fluid within the cells of the tentacles at the bending place appears under the microscope thin and homogeneous, and after aggregation consists of small, soft masses of matter, undergoing incessant changes of form and floating in almost colourless fluid.
My son Francis placed a thin slice of spinach leaf, moistened with saliva, on a leaf of Drosera, and other slices on damp cottonwool, all exposed to the same temperature.
From trials made with a large number of substances, it was found that those which the secretion of Drosera dissolves completely, or partially, or not at all, are acted on in exactly the same manner by gastric juice.
A gland of Drosera may be forcibly hit once, twice, or even thrice, without any effect being produced, whilst the continued pressure of an extremely minute particle excites movement.
Gluten, therefore, excites the glands greatly, but is dissolved with much difficulty, exactly as in the case of Drosera.
Although these filaments are so sensitive to a momentary and delicate touch, they are far less sensitive than the glands of Drosera to prolonged pressure.
Drosera is, perhaps, connected with this power, for we have seen that the fluids in which they were immersed often became pink, and the glands palecoloured or white.