Nur Karimah Binti Mohamad, Freddy Kuok San, Yeo*, Wi Soon See, Wei Hong Lay & Cheksum @ Supiah Binti Tawan
Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia
*Corresponding author: yksfreddy@unimas.my

ABSTRACT. Orthosiphon aristatus (Blume) Miq. belongs to the family Lamiaceae. There are two varieties, white corolla (OAV-1) and purple corolla (OAV-2) varieties. An observation on inflorescence and flower development of O. aristatus was conducted alongside with the study on its breeding system. Inflorescence of OAV-1 and OAV-2 varieties started to develop approximately two and a half months after transplanting the rooted cuttings. The initiation of inflorescence until the senescence took about 75 days. Flower buds started to appear on the inflorescence approximately after 17 days of the commencement of inflorescence development. The development from flower bud until flower senescence took around 50 days. The artificial pollination tests, however, suggested that O. aristatus is predominantly a self-pollinated species.

KEYWORD. Orthosiphon aristatus, floral biology, artificial pollination



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