Gloriosa superba L. (Colchicaceae), a tuberous geophyte of tropical Africa and Asia and the principal commercial source of colchicine, depends on biotic vectors for seed production. Its floral architecture enforces outcrossing: a trifid stigma on a style deflexed at 90° to the ovary, six radiating exserted stamens and a pollen-to-ovule ratio of 58333 : 1 together produce approach herkogamy and a predominantly xenogamous breeding system. This review applies a pollination bottleneck framework to the species, tracing sequential constraints on reproduction and distinguishing those demonstrated empirically from those inferred from comparable taxa. Fifty-nine sources retained from a structured search of five databases were assigned to four evidence tiers. Pollen delivery, rather than stigma availability, emerges as the binding constraint: stigmas remain receptive for 3–4 days while viable pollen persists for hours and comparative experiments show fruit set rising from 59.55 % under open pollination to 80.94 % under blower-assisted and 87.31 % under hand pollination. The deficit extends to seed quality, with hand-pollinated seed attaining 54 % germination and a vigour index of 1252. Although assessed globally as least concern (LC), the species is subject to documented regional depletion, with some 75 % of raw material demand being met from wild collection. Mitigation options nonetheless exist: supplemental hand- and blower-assisted pollination, pollen cryopreservation to widen the transfer window, assisted gene flow between characterised ecotypes and cultivation substitution together offer a practical route to improving reproductive output and maintaining genetic diversity. Density thresholds, isolation effects, phenological mismatch and floral volatile chemistry remain inferred rather than demonstrated and are identified as research priorities.
