The biological progression of Peniocereus greggii operates on a strict, chemically mediated countdown. If the flower fails to attract a suitable pollinator before direct sunlight strikes the stem, the entire investment yields zero seed stock.
| Phase / Timeframe | Morphological Action | Ecological Objective |
|---|---|---|
| 7:00 PM, 8:30 PM | Sepal parting; initial floral tube expansion | Initial scent discharge; thermal release of volatiles |
| 9:00 PM, Midnight | Maximal perimeter expansion (6, 8 in diameter) | Peak nectar pooling; long-distance pheromone signaling |
| 12:30 AM, 3:30 AM | Stamen splay; receptive stigma posture | Active cross-pollination window by nocturnal insects |
| 4:30 AM, 6:00 AM | Petal turgor loss; closure of outer floral envelope | Trapping residual pollen; defense against daytime desiccation |
| 7:30 AM, 9:00 AM | Complete structural collapse into limp tube | Ovary sealing; redirection of water reserves to tuber |
