Abstract
The shoot apex of Bougainvillea spectabilis consists of five zones: A two‐ or occasionally three‐layered tunica, a central mother cell zone, a cambium‐like zone, a rib meristem (central meristem), and a peripheral meristem. The presence of a cambium‐like zone is somewhat unusual in the apex of vascular plants, having only been reported for a few taxa. In B. spectabilis the cambium‐like zone is consistently present throughout the plastochron and all yearly seasonal periods.
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