Genus Rabelera in Tribe Alsineae
In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.
Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.
Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).
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Genus Description
Suggest a correction!Rabelera (Caryophyllaceae) is a small, temperate-boreal genus established as monotypic when described, with the type R. holostea (Linnaeus) M.T.Sharples & E.A.Tripp, widely recognized as greater stitchwort in European floras (Sharples & Tripp, 2022; Greenberg et al., 2016). Molecular phylogenetic work resolved this lineage as distinct from Stellaria, prompting its generic separation and the recombination of Stellaria holostea (Greenberg et al., 2016; Sharples & Tripp, 2022). Plants are herbaceous, typically 20–60 cm tall, with opposite, glabrous, lanceolate leaves with ciliate margins and small, early-deciduous stipules. Cymes are terminal and lateral, the pedicels articulated near the apex and often becoming reflexed after anthesis. Flowers have five sepals and five deeply bifid white petals that are longer than the sepals; the superior, tricarpellary ovary matures into a many-seeded capsule that opens by six valves. Seeds have a minute strophiole that aids in dispersal.
The genus is Palearctic, centered in Europe where it is common in woodlands, scrub, hedgerows, and calcareous grasslands, extending eastward into western Asia and North Africa (Greenberg et al., 2016). Although sometimes treated within a broader Stellaria concept, molecular data consistently place Rabelera as the sister group to a clade containing Stellaria and Cerastium (Greenberg et al., 2016; Sharples & Tripp, 2022). Chromosome counts of 2n = ca. 26 have been reported repeatedly for holostea, consistent with the family’s base number x = 13 and its paleopolyploid history (APG IV, 2016; Greenberg et al., 2016).
Circumscription has stabilized: Rabelera is treated as monotypic in recent taxonomic treatments and accepted by major databases (POWO, 2024; WFO, 2024). No invasive behavior is documented; R. holostea occurs widely and persists in semi-natural habitats without significant conservation concern. Gaps remain in fine-scale phylogeography across its Eurasian range and in comparative developmental studies that could illuminate its ecological success in forest margins and calcareous grasslands (Sharples & Tripp, 2022).
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Rabelera cilicica ((Boiss. & Balansa) Arabi, Rabeler & Zarre)
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Rabelera holostea ((L.) M.T.Sharples & E.A.Tripp)