Poa annua L. is a common component of turfgrass systems both as a weed and a desirable species. Since first classified by Carl von Linné in 1753, nearly 50 taxa of P. annua have been described, with delineations made on the basis of plant morphology and not life cycle. Yet, peer-reviewed turfgrass literature has recognized only two of these taxa over the past 50 yr, P. annua L. var. annua and P. annua var. reptans, categorizing var. annua ecotypes as upright growing annuals and var. reptans ecotypes as laterally growing perennials. Herein we provide a comprehensive review of peer-reviewed literature to highlight that these associations between life cycle and plant morphology are flawed given that morphology is plastic and strongly influenced by environment. We conclude by exploring knowledge gaps regarding P. annua perennation that, if addressed through research, would help turfgrass managers better understand the biology of the ecotypes they aim to eradicate or maintain.

中文翻译：

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目前对早熟禾生命周期的理解

Poa annua L. 是草坪草系统的常见成分，既是一种杂草，也是一种理想的物种。自 1753 年由 Carl von Linné 首次分类以来，已描述了近 50 种青蒿分类群，根据植物形态而非生命周期进行了描述。然而，经过同行评审的草坪文献在过去 50 年中仅识别出其中两个分类群P. annua L. var. annua和P. annua变种。reptans，对 var 进行分类。annua生态型为直立生长的一年生植物和变种。爬虫类生态型为横向生长的多年生植物。在此，我们对同行评审文献进行了全面审查，以强调生命周期和植物形态之间的这些关联是有缺陷的，因为形态是可塑性的，并且受环境的影响很大。最后，我们探索了关于青蒿多年生的知识差距，如果通过研究解决这些差距，将有助于草坪管理者更好地了解他们旨在根除或维持的生态型的生物学。