Abstract
Artabotrys hexapetalus is widely planted in the tropics and is known as "climbing ylang-ylang," an ornamental liana or woody climber. New natural sprouts, or water shoots, and those induced by the damage of Hurricane Andrew (24 August 1992) were collected and fixed in formalin/acidic acid/alcohol. Seeds from these plants were planted and grown in a greenhouse where seedling morphology was observed and young material collected and fixed. The development of lateral plagiotropic and orthotropic shoots was studied using both epi-illumination light microscopy and scanning electron microscopy. A series of buds develops in the axils of leaves on the orthotropic shoot. At the lateral margins of the axillary shelf, plagiotropic shoots form that will develop into either vegetative shoots, or thorns, or sympodial shoots that bear hooks and flowers. In between the two marginal buds, a series of median vertical buds develop that either remain dormant or grow out as renewal orthotropic shoots. Previous work that suggested that the plagiotropic shoot buds were displaced out of the median vertical series of supernumerary buds is not supported. The sympodial development of plagiotropic branches as inflorescence hooks is documented.
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