Plant Diversity ›› 2007, Vol. 29 ›› Issue (01): 26-32.

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Inflorescence and Flower Development of Globba barthei ( Zingiberaceae)

KONG Ji-Jun , XIA Yong-Mei , LI Qing-Jun   

  1. Xishuangbanna Tropical Botanical Garden , Chinese Academy of Sciences
  • Received:2006-04-28 Online:2007-02-25 Published:2007-02-25
  • Contact: KONG Ji-Jun

Abstract: Inflorescence of Globba barthei is a thyrse . Primary bracts are initiated in a spiral phyllotactic pattern on the inflorescence apex . Cincinnus primordia are initiated in the axils of primary bracts . These promordia develop secondary
bracts and floral primordia . The floral primordium continues to enlarge and produce a ring primordium . Sepals are initiated sequentially from the rounded corner of the primordium . The ring primordium separates three common primordium surrounding a central cavity . The adaxial common primordium is the first to separate . This primordium divides transversely and produces
petal and fertile stamen . The remaining two common primordium transversely separate and produce respectively a petal and a petaloid . As the flower developing , the cavity of the floral cup becomes triangular . The angles of this triangle are the sites of outer androecial primordium . The abaxial androecia forms slightly earlier than the two adaxial ones, and then this primordium ceases growth soon . The two posterior primordia continue growth to produce the lateral petaloid staminodes . During this stage , gynoecia initiate from the floral cup and continue to fuse and develop into style and stigma. In addition ,
Initiation of the bulbil primordium is observed at base of inflorescence axis during the early floral development . The bulbil primordium initiates in the axil of primary bract . The evolutionary significance of six androecia is discussed .

Key words: Globba barthei

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