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  Cycas siamensis
  Family Name : Cycadaceae

  Common Names : Siamese Cycad

Siamese Cycad
  • Record Info
  • Life Stage & Characteristics
    • Plant Division :
      Gymnosperms (Non-Flowering Seed Plants)
      Plant Growth Form :
  • Biogeography
    • Native Distribution :
      Central Thailand, Laos and Vietnam
      Native Habitat :
      Preferred Climate Zone :
      Tropical, Sub-Tropical / Monsoonal
      Local Conservation Status :
  • Description & Ethnobotany
    • Plant Morphology :
      Growth Form: It is a small cycad with underground or above ground trunk, up to 1.5 m tall, with a swollen base.
      Foliage: Mature leaves are bright green, feather-like, erect (0.6 – 1.2 m long) and arching, with leaf tips often recurved. Each leaf comprises of 140 – 280 leaflets which are hairy, shiny green above and pale green underneath. Colour of leaflets hairs is variable and range from white, yellow, orange or brown. Petiole is 10 – 30 cm long, hairy and the margin is lined with thorns. Cataphyll is 5 – 7 cm long and densely covered with brown woolly hairs.
      Reproductive Parts (non-flowering plant): Male cone is narrowly oblong (10 – 24 cm long and 5 – 7.5 cm wide), with orange to brown hairs, and emits a strong unpleasant odour. Female cone is flattened globose (8 – 14 cm diameter), sporophylls are covered with brown hairs and round apical lobes are lined with 22 – 46 spines at the margin. Seed is almost round (3 – 3.7 cm long and 2.5 – 3.5 cm wide) with yellow seed coat.
      Habitat :
      It is found in lowland seasonally dry forest with distinct wet and dry season.
      Cultivation :
      Established plants are tolerant to drought but sensitive to disturbance, making transplanting difficult. Overwatering during dormant period may result in rot.
      Ethnobotanical Uses :
  • Landscaping Features
    • Plant & Rootzone Preference/Tolerance :
      Well-Drained Soils
      Landscape Uses :
      Parks & Gardens
  • Plant Care & Propagation
    • Light Preference :
      Full Sun
      Water Preference :
      Moderate Water
  • Foliar
    • Mature Foliage Colour(s) :
  • References
    • Jones, D.L. 2002. Cycads of the World. Ancient Plants in Today's Landscape. 2nd Edition. United States of America: Smithsonian Institution Press. 456

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