Dendrobium candidum in Jiaodu Mountain is a specialty of Rong County, Yulin City, Guangxi.
1, morphological characteristics
Dendrobium candidum is a perennial epiphytic herb of Orchidaceae. Its stem is upright and cylindrical, with a length of 5-35cm, a diameter of 0.3-0.6cm and an internode length of1-2.5cm.. There are purple longitudinal stripes, purple-red or yellow-green, annual stems are translucent to light, and strip fibers can be seen inside, and the nodes are iron blue to black, so there are also black nodes. There are stalk marks and residual leaf sheaths on the nodes. Leaves alternate, 3 ~ 20, tender leaves purple, old leaves yellow-green, born on the upper nodes of the stem, in two rows, oblong-lanceolate, 3 ~ 7 cm long, 0.8 ~ 2.0 cm wide, blunt apex, slightly hooked, extending downward from the base to the leaf sheath supporting the stem, and the edge and midvein are often purple; The leaf sheath is grayish white with purple spots, the sheath mouth is open, and the stalk does not exceed the last section. There is often an annular gap between the two, which is hard and brittle. Racemes, born at the top of leafless stems, 2 ~ 4 cm long, bent into folds. There are 1 ~ 3 flowers on each node, which are light yellow, white and slightly fragrant. The flower is lip-shaped, with a diameter of 1.5 ~ 2.0 cm, and one petal mutates into a lip. The white pistil and stamen of Dendrobium candidum combine to form a typical syncytial column. The pistil is located below and the stamens are located above. Each flower has 4 pollen grains, the cap is nearly oval, the top is cracked in the middle, the bud is white, the perianth is yellow-green, oval-lanceolate, 1.6cm long, and there is a large purple patch on the upper part of the white-purple stripes on both sides of the lower part. The middle sepal is petal-like, oblong and lanceolate, with a length of 1.7 ~ 1.9 cm and a width of 0.4 ~ 0.5 cm, and the lateral sepals are about 1 cm. Calyx conical, 0.5 cm long, densely papillate pubescent on stigma plate, with 1 yellow callus at base. The fruit of Dendrobium candidum is a round capsule, which is 3 ~ 5 cm long and yellow-green when mature. Each fruit contains tens of thousands of seeds, which are yellow-green under the ordinary optical microscope, with wings at both ends and a long spindle shape. The size of the seeds is 0.4mm long and 0.09mm wide.
2. Ecological habits
Dendrobium candidum is mainly distributed in Yunnan, An Wei, Guizhou, Guangxi, Zhejiang, Guangdong and other provinces in China, and also distributed in Tibet. It has strict requirements for the ecological environment. Most of them are epiphytic in the rocks or forests at the edge of the forest at an altitude of 265,438+000 ~ 2,500 meters, covered with moss and covered with wild vines and broad-leaved trees with thick diameters. It likes cool and humid environment and usually interacts with lichens, ferns and mosses. Suitable for growing in an environment with a relative temperature of more than 70%. The annual average temperature in the growing period is 17 ~ 22℃, and the temperature difference in the hottest month in Leng Yue is not obvious. 1 month, the average temperature is above 10℃, the frost-free period is 250 ~ 250 days, and the annual rainfall is above 1000 mm, so it is drought-resistant and cold-resistant. The flowering period is mainly from May to late June and lasts for 3-6 months. Shading fruit 10 ripens from the first ten days to February of the following year. Dendrobium candidum has extremely small seeds, incomplete embryo development and no endosperm tissue, and its germination rate is extremely low in natural state, which makes sexual reproduction extremely difficult. It mainly relies on asexual reproduction, constantly separating roots or rooting from upper stems to grow new plants. The life span of a stem is usually three years. The axillary buds at the base of biennial stems germinate into seedlings from March to early April, and 1 female stems can produce 1 ~ 3 new seedlings, which are usually harvested in the late autumn and early spring of the third year.
Location:
Guangxi
Applicant:
Guangxi rongxian county Jin di tie pi Shi Hu planting professional cooperative
Location:
20 13
territorial scope
Dendrobium candidum reserve in Du 'ao Mountain is located in the southeast of Guangxi Zhuang Autonomous Region, with east longitude11015'-1053', north latitude 22 27'-23 07', and the maximum horizontal distance from east to west is 565437'. It is adjacent to Cenxi in the east, tengxian in the northeast, Xinyi and Beiliu in the south, Beiliu in the west, Guiping in the northwest and tengxian and Pingnan in the north. Yugui Mountain at the eastern end of Dapochong is in the east, Dadong and Chen Chong at the western end of the stone are in the west, Dog Ridge Mountain at the southern end of Licun is in the south, and Datianwei, Pingshan, Gujie and other villages are in the north. The geographical protection scope of geographical indications of Dendrobium officinale agricultural products in Du 'ao Mountain includes Rongzhou Town, Rongxiang Town, Shili Township, Shizhai Town, Yangmei Town, Lingshan Town, Liuwang Town, Licun Town, Yangcun Town, Xiandi Town, Liangzi Town, Langshui Town, Songshan Town, Luojiang Town, Shitou Town, etc. 15 towns and 2/kloc-5 towns under its jurisdiction.