Cycas panzhihuaensis
Cycas panzhihuaensis
Cycas panzhihuaensis (Chinese攀枝花 苏铁, Pinyin Panzhihua Sutie; German Panzhihua Sagopalmfarn ) is a flowering plant in the genus Sagopalmfarne ( Cycas ), the only genus in the family of Cycadaceae. It is named after the city of Panzhihua and grows in the mountain regions of the Chinese provinces of Sichuan and Yunnan 1100-2000 m ..
In the, belonging to Panzhihua City Renhe district on the border of Sichuan Province to Yunnan a national nature reserve for Cycas panzhihuaensis was established ( Panzhihua Sutie Guojiaji Ziran Baohuqu攀枝花 苏铁 国家级 自然 保护Panzhihua Dukou Cycad National Nature Reserve ).
Cycas panzhihuaensis thrives on grass -covered places and in the thicket on limestone and sandstone in the arid Yangtze River valley at altitudes 1100-2000 meters only in the southwestern Sichuan and northern Yunnan.
Description
Cycas panzhihuaensis is a woody plant that plant height usually 1-2, rarely up to 3 meters and trunk diameter of 15 to 20 centimeters reached.
The crown consists of 30 to 80 fronds. The pinnate leaves are gray-green, 70 to 150 centimeters long and flat with 140 to 250 against permanent pinnae. The petiole having 7 to 25 centimeters in length from 15 to 25 % of the total length of the sheet; it is spined to 50 to 70% of its length. The basal leaflets are 5-7 inches long. In the middle region of the leaf the leaflets are 12 to 23 inches long and 5-7 mm wide with an angle of 50 to 60 ° to the rachis. The narrow triangular, soft and woolly hairy -leaves ( Cataphylle ) are 6-9 inches long and persistent.
Cycas panzhihuaensis is dioecious getrenntgeschlechtig ( dioecious ).
The male plants produce cones; they are spindle-shaped or oval - cylindrically, yellow, have a length of 25 to 50 centimeters and a diameter of 8 to 14 inches. The Mikrosporophylle are 40 to 60 millimeters long and 18 to 32 millimeters wide; their fertile zone is 30 to 40 millimeters long, and the sterile area is 8 to 11 mm long. The pollen will be held until May in April.
The female plants produce more than 30 Megasporophylle; they are 11 to 21 inches long and yellowish to brownish woolly hairs with one to five ovules.
The nearly spherical seeds are 25-35 mm long and 22-30 mm wide. The sarcotesta is red to orange and 1.5 millimeters thick. The seeds ripen from September to October.
System
Based on reference copies that had been collected from Si -Yuan Yang and Bin Wu 1979 near Dukou ( Panzhihua ), described the Chinese gardener Lin Zhou and Si -Yuan Yang 1981, the plant under the taxon Cycas panzhihuaensis. In the same magazine issue also contains a description of a second species Cycas baguanheensis appeared in the class by the Chinese herbalist Li Kuo Fu and Shu Zhi Cheng of the Institute of Botany in Beijing, on collecting specimens from the same expedition in 1979, collected by Yang and Wu in Baguan He near Panzhihua, based. It is now assumed that the specimens described in Cycas baguanheensis represent only a kümmerwüchsige form of the same species Cycas panzhihuaensis from a less attractive location.
Swell
- Datasheet Cycas panzhihuaensis at The Cycad Pages. ( English )
- Jiarui Chen & Dennis W. Stevenson: Cycadaceae in the Flora of China, Volume 4, page 5: Cycas panzhihuaensis - Online.