J Syst Evol ›› 2012, Vol. 50 ›› Issue (1): 72-82.DOI: 10.1111/j.1759-6831.2011.00165.x

• Research Articles • Previous Articles    

A new species of the extinct genus Austrohamia(Cupressaceae s.l.) in the Daohugou Jurassic flora of China and its phytogeographical implications

1Jian-Wei ZHANG 2Ashalata D'ROZARIO 3Li-Jun WANG 4Ya LI 1Jian-Xin YAO*   

  1. 1(Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)
    2(Department of Botany, Narasinha Dutt College, 129, Howrah 711101, India)
    3(College of Ethnology and Sociology, South Central University for Nationalities, Wuhan, 430074, China
    4(State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)
  • Received:2011-04-15 Published:2012-02-03

Abstract: A new conifer, Austrohamia acanthobractea, sp. nov., is described from the Jurassic Daohugou flora, Inner Mongolia Autonomous Region, China. The material consists of impressions represented by well-preserved leafy twigs and branches as well as ovulate cones. Leafy shoots with at least two orders of branching; ultimate branchlets alternate or sub-opposite with helically arranged leaves, decurrent at base with distal rounded tip; dorsiventrally flattened and univeined. Ovuliferous cones elliptical, less than 1 cm long, terminally borne on ultimate and penultimate branches, composed of helically arranged bracts with ovules disposed on their adaxial surfaces. The presence of similar, if not identical taxa, on both sides of the Pacific indicates the cosmopolitan distribution of primitive Cupressaceae between East Asia (Eurasia) and South America in the Pangaea.

Key words: Austrohamia acanthobractea, China, Cupressaceae s.l., Jurassic, Pangaea, phytogeography.