Abstract
The growth habit, axillary bud differentiation, pseudobulb development and flower bud formation in Oncidium Boissiense, a sympodial orchid hybrid, were observed from 24 January to 2 October 1980. The axillary bud on the basal part of the latest back-bulb (last year's growth) started to develop new growth (the “lead”) in early spring. The upper portion of the lead swelled to form a pseudobulb. The pseudobulb development started on 20 March and terminated between early July and early August. At the early stage of the lead development, four axillary buds had already differentiated at the axils of the basal sixth or seventh node and upwards. The uppermost bud started to elongate after mid-May, and developed into a flower-stalk. Branch formation in the axil of the bract on the flower stalk was observed in mid-May. Floret bracts were formed on the branches in mid-June. Floret primordia were differentiated at the axils of these bracts in early-July. Florets developed to the pollen-formation stage by 25 September and bloomed in mid-October 1980. Possible factors affecting flower-stalk development and floret initiation of this hybrid are discussed.
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