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Genus Anemia in Family Anemiaceae

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

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Anemia (Sw.) is a cosmopolitan fern genus in the family Anemiaceae, with approximately 110–130 species widely distributed in the Neotropics and with disjunct taxa in tropical Africa and Madagascar (Smith et al., 2006; Christenhusz & Chase, 2014; PPG I, 2016). The type species is Anemia hirsuta (Sw.) L. (POWO, 2024).

Morphologically the genus is defined by dimorphic fronds and highly contracted fertile pinnae that elevate the sporangia on elongated stalks; the sporangia bear an apical acrostichoid indusium, and the spores are trilete with acrolamellate or reticulate ornamentation (Mickel, 1962; Smith et al., 2006). Rhizomes are erect or short-creeping and usually bear articulate hairs or scales, while leaves are typically 1–4-pinnate with membranous to chartaceous texture, and sori are borne along the midrib and lateral veins (Mickel, 1962; Smith et al., 2006; PPG I, 2016).

Diversity peaks in Brazil, with many narrowly endemic species in campo rupestre and cerrado; additional centers of richness occur in the Andes and Mesoamerica, while African and Madagascan taxa represent relictual disjunctions (Smith et al., 2006; PPG I, 2016). Species occupy rocky outcrops, open woods, and dry to seasonally wet habitats from lowlands to middle elevations. Reproductive biology follows the fern norm, with wind-dispersed spores; the base chromosome number is x=38 (Love et al., 1977; Smith et al., 2006).

Major clades align with geography and morphology, with most Andean and Brazilian taxa forming a supported “Braziliana clade” (Skeleton in Smith et al., 2006). Classical sectional schemes are little used now, and genus-wide phylogenies have not fully resolved relationships among all lineages (Smith et al., 2006; PPG I, 2016). Mohria is treated within Anemia in some current syntheses (PPG I, 2016), though alternative treatments maintain it as distinct (Christenhusz & Chase, 2014; Smith et al., 2006). As currently circumscribed, Anemia remains taxonomically stable overall, but species-level limits in the “A. tomentosa complex” and related groups are incompletely resolved (PPG I, 2016; Smith et al., 2006).

Human relevance is primarily horticultural; several species are cultivated as foliage ornamentals for their graceful, light-sensitive fronds (Mickel, 1962; PPG I, 2016). No species are major weeds or primary timber resources (PPG I, 2016). Major threats include habitat loss from mining and agriculture in campos rupestres and Brazilian shield highlands, and targeted phylogenetic work in South America is needed to refine conservation assessments (Smith et al., 2006; PPG I, 2016).

References: POWO, 2024; Smith et al., 2006; Mickel, 1962; PPG I, 2016; Christenhusz & Chase, 2014; Love et al., 1977.

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