The proposition of patterns, types, and variations for embryogenic events is one of the objectives of embryonomy. Bromeliaceae is a diverse neotropical plant family for which this approach has been ambiguously and rarely discussed in detail. In this study, we analyzed the embryogeny and endospermogenesis of Billbergia nutans H. Wendl. ex Regel, a bromeliad worldwide known as ornamental and with no embryogenic studies recorded to date. Seeds of B. nutans were periodically collected after manual pollination and processed with standard methods for analysis under light microscopy. Among other embryogenic characteristics, we highlight the longitudinal division of ca and its major contribution to the formation of the embryo, the presence of hypophysis derived from m, and the formation of the first internal cells of the proembryo from q. Endospermogenesis is helobial, and the cellularization in each chamber occurs at specific stages of the embryogenesis. The embryonic number is 211 and the embryonomic formula ca = pco + phy + pvt + icc; cb = iec + ico + co + s, typical of the Onagrad Type. This classification is unprecedented for Bromeliaceae, although it can be contradictorily applied to other species of the family. Special embryogenic characteristics of B. nutans, as the contribution of n in the formation of the root cap and the longitudinal divisions in the suspensor cells, led to the proposal of a new variation for this type: the Billbergia Variation, which also can be applied to some other Bromeliaceae species.

胚胎发生事件的模式、类型和变异的命题是胚胎学的目标之一。凤梨科是一种多样化的新热带植物科，对此方法的讨论含糊不清，很少详细讨论。在这项研究中，我们分析了Billbergia nutans H. Wendl的胚胎发生和胚乳发生。ex Regel，一种世界范围内被称为观赏植物的凤梨科植物，迄今为止还没有胚胎发生研究的记录。人工授粉后定期收集B. nutans 的种子，并用标准方法处理以在光学显微镜下进行分析。在其他胚胎发生特征中，我们强调了ca的纵向分裂及其对胚胎形成的主要贡献，来自于m，以及从q形成原胚胎的第一个内部细胞。Endospermogenesis 是 helobial，并且每个室中的细胞化发生在胚胎发生的特定阶段。胚胎数为211，胚胎组学公式ca  =  pco  +  phy  +  pvt  +  icc；cb  =  iec  +  ico  +  co  +  s，典型的 Onagrad 类型。这种分类对于凤梨科来说是前所未有的，尽管它可以矛盾地应用于该科的其他物种。B. nutans 的特殊胚胎发生特征，作为n的贡献在根冠的形成和悬细胞的纵向分裂中，导致了这种类型的新变异的提议：Billbergia Variation，它也可以应用于其他一些凤梨科物种。