Labyrinth cycad, Cycas cycas spp., National-level key protected wild plants Ⅰ (State Council August 4, 1999 approved).
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Status quo
Endangered species. In recent years, due to the dredging for those growing ornamental increase with age, while the development of cash crops in southern Yunnan, natural forest were destroyed in the dioecious, rarely spend knot, resulting in a sharp reduction in the plant, there is the risk of changes to endangered species.
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Morphology
Palm-like evergreen plants, up to three meters, cylindrical trunk, covered by the persistent petiole. Leaves pinnatisect, 1-1.5 meters long, petiole 15-30 cm long, about 2 mm on both sides of sparse thorn; pinna 80-120 right, hard leathery, lanceolate-linear, 15-20 cm wide and 6-8 mm, apex acuminate, base cuneate, asymmetry, the veins bulge on both sides. Dioecious, male cones solitary stem tip, long cone-shaped, with numerous small spore spirally arranged leaflets, 10-15 cm in diameter, microsporophylls wedge, 3.5-4.5 cm long, densely tawny hair, below gather a majority of 3-5 students microsporangium; megasporophyll majority clustered stem tip, densely tawny hair, wide round the upper rhombic-shaped, 6-8 cm wide, there are more than 30 diamond-shaped lobes, lobes 3-3.5 cm long, apex caudate thorns, the lower megasporophyll narrow handle like a thick, long PCT 3-7, 2-4, both sides of the ovule born megasporophyll middle. Seeds ovate-spherical, 4.5-5 cm long, 4-4.7 cm in diameter, reddish-brown when ripe.
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Geographical distribution
In our country located in southern Yunnan Honghe, Simao and Xishuangbanna. Born Chang altitude 1500 meters below Under the green-leaved woodland or scrub between secondary. India, Nepal to countries in Indochina are distributed.
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Ecological and biological characteristics
Distribution area is located in the southern part of Yunnan Plateau subtropical monsoon evergreen broad-leaved forest area. The annual average temperature is 16 -20 ℃, annual precipitation 1000-1500 mm, concentrated in the rainy season, landing a long dry season. The soil is lateritic, ph value of 4.5 -6. Chang was born with thick edge glauca cyclobalanopsis thorelii (hick.et a camus) hu, hairy leaves glauca c.keri i (craib) hu, Emei superba schima wallichii choisy dominant evergreen broad-leaved forest; or Emblica phyll anthus emblica l., hairy fruit Kei plate glochidion eriocarpum champ. marked secondary shrub can also be seen. Chang 1-3 years once flowering, flowering in June-July, the seeds mature in February-March next year. Usually from April to May from stem tip sprouting new leaves, often persistent 3-4 years, and petiole base is often persistent on the stem.
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Conservation value
Similar to the shape of its megasporophyll and Permian fossil cycads, cycads study of evolution, distribution and paleogeography, paleoclimate and so valuable. Shuzi beautiful strange for viewing.
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Safeguard
Xishuangbanna, Simao or should be the appropriate choice to be protected as a nature reserve zoning; biological characteristics and should be strong, as a lot of the scientific basis for the production of seedlings.
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Cultivation techniques
Propagation by seed. Short seed longevity. After harvesting the fruit ripening seedlings sown in celebration, about 1-2 months to germinate emergence. Seedling growth is slow, seedling management need to be strengthened. While the mother tree roots sprouted Emerging Artists can also be tillering breed.
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Species Information
Branch Chinese name: cycads Chinese name: Cycas Chinese name: Cycas labyrinth Section English name: Cycadaceae Is the English name: Cycas spp Species English name: Cycas pectinata Griff. Ecological features: Born under the evergreen broad-leaved woodland shrub or secondary inter- Community Characteristics: evergreen broad-leaved forest or secondary shrub Associated species: thick edge glauca Cyclobalanopsis thorelii (Hick. et A. Camus) Hu Mao Ye glauca C. kerii (Craib) Hu Emei superba Schima wallichii Choisy hair emblica Phyllanthus emblica L. fruit Glochidion Glochidion eriocarpum Champ. Flowering :3-April Fruit :9-October Lower altitude: 800 m Upper elevation: 1300 meters
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Geographical distribution
In China, distributed under the evergreen broad-leaved woodland in southern Yunnan Jinghong, Red River, Simao and Xishuangbanna region Cuiyun district or secondary shrub Room (altitude 1500 m or less). In addition, India, Nepal, Bhutan, Bangladesh, Myanmar, Vietnam, Laos, Thailand are distributed.
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Endangerment
China Plant Red Data Book - Rare and Endangered Plants (Volume I) a 1992 National key protected wild plants recorded (first batch) a 1999 Wild plant protection regulations of the PRC level 1996
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Status and Protection
Endangered species in recent years due to the dredging for those growing ornamental increase with age, while the development of cash crops in southern Yunnan, natural forest were destroyed in the dioecious, rarely spend knot, resulting in a sharp reduction in the plant, have become endangered species danger. Xishuangbanna, Simao or should be the appropriate choice to be protected as a nature reserve zoning; biological characteristics and should be strong, as a lot of the scientific basis for the production of seedlings.
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Flowers encyclopedia
Introduction labyrinth cycad Labyrinth cycads (Cycas pectinata Griff.) Genus: Cycads Alias: Characteristics: Palm-like evergreen plants, up to three meters, cylindrical trunk, covered by the persistent petiole. Leaves pinnatisect, 1-1.5 meters long, petiole 15-30 cm long, about 2 mm on both sides of sparse thorn; pinna 80-120 right, hard leathery, lanceolate-linear, 15-20 cm wide and 6-8 mm, apex acuminate, base cuneate, asymmetry, the veins bulge on both sides. Dioecious, male cones solitary stem tip, long cone-shaped, with numerous small spore spirally arranged leaflets, 10-15 cm in diameter, microsporophylls wedge, 3.5-4.5 cm long, densely tawny hair, below gather a majority of 3-5 students microsporangium; megasporophyll majority clustered stem tip, densely tawny hair, wide round the upper rhombic-shaped, 6-8 cm wide, there are more than 30 diamond-shaped lobes, lobes 3-3.5 cm long, apex caudate thorns, the lower megasporophyll narrow handle like a thick, long PCT 3-7, 2-4, both sides of the ovule born megasporophyll middle. Seeds ovate-spherical, 4.5-5 cm long, 4-4.7 cm in diameter, reddish-brown when ripe. Distribution and habits: In our country located in southern Yunnan Honghe, Simao and Xishuangbanna. Born evergreen broad-leaved woodland altitude of 1500 meters below the lower or secondary inter-shrub. India, Nepal to countries in Indochina are distributed. Distribution area is located in the southern part of Yunnan Plateau subtropical monsoon evergreen broad-leaved forest area. The annual average temperature is 16-20 ℃, annual rainfall of 1000-1500 mm, concentrated in the rainy season, landing a long dry season. The soil is lateritic, pH value of 4.5-6. Chang was born with thick edge glauca Cyclobalanopsisthorelii (Hick.etACamus) Hu, hairy leaves glauca C.KERII (Craib) Hu, Emei Schima SchimawallichiiChoisy dominant evergreen broad-leaved forest; or emblica phyllanthusemblicaL, Kei fruit plate GlochidioneriocarpumChamp hair as a symbol. The secondary shrub can also be seen. Chang 1-3 years once flowering, flowering in June-July, the seeds mature in February-March next year. Usually from April to May from stem tip sprouting new leaves, often persistent 3-4 years, and petiole base is often persistent on the stem. Propagation and cultivation: Propagation by seed. Short seed longevity. After the fruit is ripe harvest sown in the seedbed, about 1-2 months to germinate emergence. Seedling growth is slow, seedling management need to be strengthened. While the mother tree roots sprouted Emerging Artists can also be tillering breed. Application: Endangered species, which is similar to the shape of megasporophyll Permian fossil cycads, cycads study of evolution, distribution and paleogeography, paleoclimate and so valuable. Shuzi beautiful strange for viewing. Photo: