Scientific name: Pellionia repens (Lour.) Merr.
Family is: Urticaceae
characteristic:
Annual succulent herb, erect and scattered, bald net, 15 cm high, stems delicate, green and purplish.
Leaves: 2-lobed, stipitate, unequal in size, elliptic and spatulate, large ca. 5 mm in length, relatively small, entire, with inconspicuous pinnate veins.
Flowers: Minimal, axillary, dense, subsessile, shorter than leaf poly-flowers, flowers pale green or red, less than 1 mm long, flowering: summer.
Ecological distribution:
Native to tropical America, it is now widely distributed in tropical areas.
Remarks:
Born on the wet wall, Guangzhou can be seen everywhere. When the flowers bloom, after shaking, the stamens emit pollen-like pollen, so English has the name of gunpowder tree.
A family of dicotyledonous plants of the subfamily Merlot. Often herbs, sometimes shrubs, thinly arborous, bristly, bristly, with bulging globules on leaf epidermis; flowers small, unisexual, perianth monolayered, often greenish, stamens as long as tepals In the opposite direction, the filaments are folded inward at the time of flower buds. Most vertebral joints are present. When the flower is open, the pollen that emerges suddenly outwards is like a firework, spread by the wind, the carpel and the stigma 1, the ovules 1 and erect, and the inflorescence often gathers. Umbrella, spiculate, or conical, sparsely raised on succulent inflorescences; degraded pistil often present, staminodes scalelike. Fruit achene or fleshy stone fruit; seeds often have endosperm with erect embryos. The pollen grains are usually oblate spheroids or globular, with 2 to 5 holes, dilute to scattered holes, equatorial diameter of 8 to 22 microns, surface glyphs with fine particles, small spines or fine mesh. Chromosome base x=6-14. There are about 1900 genera and more than 190 species, distributed in tropical and subtropical regions in the world and a few to temperate regions. There are more than 350 species of 25 genera in China, mainly distributed in the south of the Yangtze River basin.
Classification is divided into 6 groups:
1 Ramie, with bristles, female flowers are 4 cracked, free from ovary. In 10 genera, there are 5 genera such as Urtica.
2 Rattan race, the plant is free from mane, the female flower is split by 3(～5), and it is separated from the ovary, and the stigma is head-shaped. In 8 genera, there are 5 genera in China, including Lenghuahua and Stellaria.
3 Ramie family, without bristles, flower unisexual, female flowers often tubular, adnate to ovary, stigma tongue to filamentous. Of the 20 genera, there are 12 genera, including Urtica and Hemia, in China.
4 Wall grass family, without bristles, flower heterogeneity, small bracts often combined to synthesize total pupae, female flowers are tubular. 6 genus, China only has 1 genus of genus wall grass.
5 Monocincmus, without hairs, male flowers degenerate to 1 stamen. 3 genus, China only has 1 genus of Drogue-tia.
6 The Marsh-headed, non-bristle, stamen erect, different from the above-mentioned groups, and similar to the moraceae, but the ovules are erect and consistent with the ricinaceae, and these characteristics indicate that this is between the urticaceae and the moraceae. There is a transitional group among them, so there is a proposal for a separate division. 2 genus, China only has 1 genus of the genus Pseudocephalus.
Many of the genus in the ricinaceae, such as genus Urtica, genus Hemma, genus Laciferus, hydrocephala, schisandra, genus Zygophyllum, genus Urtica, genus Apricot and genus Pleurotus are all important Fibre plants: Ricinus communis, Cinnamomum vulgare, and red live hemp are the most important cultivated fiber plants in southern China. There are some species in the genus Lenghuahua, Xenia, and Stellaria. The stems are fleshy, leafy green, exotic or have beautiful patterns, and are widely cultivated for ornamental purposes.
The undergraduate Ramie plant has unique bristles that other higher plants do not have. Once it touches the skin of humans or livestock, it can cause erythema, itching, and some species can even cause death of children or young animals.
This kind of bristles is an epidermis-specific glandular hair consisting of single-celled capillaries and multi-celled hairy pillows. The upper wall of the capillary tube is siliceous and brittle, and the lower part is calcified and hard. The function of stimulants.
The venom of the bristles is complex and contains a special enzyme and formic acid, acetic acid, butyric acid, and nitrogenous acids.