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Genus Danthonia 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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Danthonia (authority: DC.) is a grass genus placed in Poaceae, tribe Danthonieae, and classified within subfamily Arundinoideae (WFO, 2024; TB2, 2024). About 110 species are accepted globally (POWO, 2024), forming perennial, tufted grasses of temperate regions with centers of diversity in Australia, southern Africa, and the Americas (Clark & Fisher, 1987). The type species is frequently taken as Danthonia spicata (L.) P. Beauv. (Clarke, 1977; TB2, 2024). Most species occur in open grasslands, heathlands, and open woodlands from lowland to high-elevation sites.

Diagnostic morphology centers on tufted habit and leaf sheaths that are rounded, usually glabrous. Ligules are membranous, often ciliate, and blades are narrow, flat or inrolled, sometimes papillose. Inflorescences are open to contracted panicles, the spikelets usually ovate to lanceolate, laterally compressed, with 3–12 florets and keeled glumes. The base chromosome number is x = 6, with frequent polyploid series (Löve & Löve, 1975).

Diversity and distribution reflect regional specialization. Australia hosts many endemics, often in seasonally dry or fire-prone habitats (Jacobs & Everett, 1996). Southern African taxa dominate fynbos and grassland mosaics, several narrow endemics occurring in the Drakensberg and adjacent highlands (Gibbs Russell et al., 1990). New Zealand’s few species occupy alpine and subalpine grasslands, while North America’s species thrive in eastern woodlands and boreal meadows (Clark & Fisher, 1987). At high elevations, Danthonia often occupies exposed sites with low competitive pressure.

Intrinsic biology is typical of open-habitat grasses. Flowering occurs in spring–summer, with wind pollination and caryopsis dispersal; vegetative spread is common via short rhizomes or tight clumps. Chromosome numbers are frequently 2n = 24 or higher polyploids based on x = 6 (Löve & Löve, 1975), supporting ecological flexibility.

Taxonomy and phylogeny have been historically complex, with Danthonia treated more broadly in the 19th century but narrowed after work by Clayton (1987), Connor (1998), and contemporary analyses. The genus is currently recognized as monophyletic within Danthonieae and shows clear differentiation from allied genera such as Pentaschistis and Karroochloa (Barker et al., 2007; Snow et al., 2003). Traditional sectional treatments have been largely superseded by phylogenetic delimitations, and a residual amount of synonymy persists where historical circumscriptions overlapped with Chionochloa (Australia–New Zealand) and Tribolium (South Africa). POWO (2024) provides current accepted names and synonymy.

Human relevance is modest. Several species are occasionally used in native landscaping or restoration plantings for drought tolerance and aesthetic inflorescences, but Danthonia is not a major crop or timber genus. Some weedy taxa appear in pasture or rangeland contexts, generally of limited invasive impact.

Conservation outlook varies regionally. Several narrow endemics face localized habitat loss or overgrazing, and comprehensive red-list assessments are incomplete (POWO, 2024). Future work integrating phylogenetic sampling, chromosome surveys, and population monitoring will clarify diversification and conservation priorities.

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