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Genus Bothriochloa in Family Poaceae

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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Bothriochloa (Poaceae, subfamily Panicoideae) is a warm‑season grass genus of roughly 35 accepted species (WFO, 2024; POWO, 2024). The name commemorates the pitted (bothri‑) lemma of the sessile floret, with Andropogon pertusus (L.) Willd. treated as the lectotype in early revisions (Clayton & Renvoize, 1982; Watson & Dallwitz, 1992). Its main distribution spans tropical and subtropical regions of the Old World from Africa and the Mediterranean through Asia to Australasia, with two species introduced and naturalized in the Americas (GBIF, 2024). Most taxa occupy open grasslands, savannas, disturbed sites, and anthropogenic edges from near sea level to moderate elevations.

Diagnostic morphology centers on the panicle formed by one to many solitary or paired, subdigitate rames; each pair includes a sessile and a pedicellate spikelet. Sessile spikelets are dorsally compressed, with the lower glume usually concave to slightly winged on the back; the upper glume is keeled; the lower floret is usually reduced to a lemma; the upper fertile floret bears a straight or twisted geniculate awn. Pedicellate spikelets are similar but reduced, typically awnless, and their pedicels are fused with the internode below forming the characteristic “bearded” rachis. Leaf blades are usually flat; ligules are membranous and ciliate; plants are typically perennial with rhizomes or stolons, though some are annual. The fruit is a caryopsis.

Centers of diversity lie in Africa and southern Asia; several taxa are regional endemics. They occupy warm grasslands and light woodlands, often thriving in fire‑prone and nutrient‑poor substrates, and frequently in human‑modified habitats. In many species, hybridization and facultative apomixis generate polyploid complexes, contributing to taxonomic instability and niche breadth (POWO, 2024; Smith et al., 2022). The base chromosome number is often reported as x=9, with polyploid series documented in widespread taxa (Clayton & Renvoize, 1982).

Historically, Bothriochloa has been segregated from Andropogon based on rachis and glume morphology, and intergrades with Dichanthium and Capillipedium are well known (Clayton & Renvoize, 1982). Molecular analyses have supported a close relationship among these genera and prompted recognition of Capillipedium by some authors (GPWG II, 2001; Teisher et al., 2021). Bothriochloa is therefore best treated in a broad sense with uncertainty, and species limits remain dynamic.

Bothriochloa species are widely used as forage and rangeland indicators (e.g., B. bladhii, B. ischaemum), while B. ischaemum and others may become weedy in altered landscapes (GBIF, 2024). Conservation concerns center on invasions rather than native declines, but data gaps persist for endemic taxa. Future work integrating genomic, cytogenetic, and biosystematic approaches will refine species circumscriptions and inform management in changing climates (GPWG II, 2001; Teisher et al., 2021; POWO, 2024).

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