They may, for instance, be glandular or stinging, as in the common stinging nettle, where the top of the hair is very brittle, easily breaking off when touched.
- Male Flowerof the Nettle (Urtica).
To these three characters the Hydrozoa add a fourth which is distinctive of the subdivision of the Coelenterata termed the Cnidaria; that is to say, they always possess peculiar stinging organs known as nettle-cells, or nematocysts (Cnidae), each produced in a cell forming an integral part of the animal's tissues.
Pedunculata), walnut, nettle tree (Celtis australis, L.), Siberian elm (Zelkova crenata, Spach), and various kinds of poplar.
T ? ??, teombe Nettle F +e yPa-N+1l.N *'+R Slueumber'??r aC I°nh s 1 E gy jj l '° ° o e^M dc pford?
By means of the stinging nettle-cells or nematocysts with which the tentacles are thickly covered, living organisms of various kinds are firmly held and at the same time paralysed or killed, and by means of longitudinal muscular fibrils formed from the cells of the ectoderm the tentacles are contracted and convey the food to the mouth.
I have watered the red huckleberry, the sand cherry and the nettle-tree, the red pine and the black ash, the white grape and the yellow violet, which might have withered else in dry seasons.