PlantaeDB Logo
Login Sign-up

Genus Schizachyrium 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).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Schizachyrium (Authority: Nees) is a genus of C4 perennial and annual grasses in Poaceae (tribe Andropogoneae, subtribe Schizachyriinae; APG IV, 2016; Soreng et al., 2023). It encompasses roughly 60 species globally (POWO, 2024; WFO, 2024; Welker et al., 2019). The type species is Schizachyrium condensatum (Kunth) Nees (Clayton & Renvoize, 1982). The genus is distributed pantropically, prominent in tropical and subtropical savannas, grasslands, and open woodlands across Africa, the Americas, Asia, and Australasia, with secondary centers of diversity in southern Africa and the Neotropics (Welker et al., 2019; WFO, 2024).

Vegetatively, Schizachyrium forms densely tufted (caespitose) clumps; leaf blades are usually narrow and flat or inrolled, and basal sheaths may be hairy. The inflorescence is a pair of homogamous racemes on a peduncle and subtended by a spatheole, an arrangement typical of Andropogoneae. Racemes comprise multiple units each with one sessile, fertile spikelet and one pedicelled sterile (or reduced) spikelet; glumes are firm and keeled, with awned or awnless lemmas. The ovary is superior with lateral placentation (Stebbins, 1956). Fruits are caryopses with callus hairs and straight or twisted awns that facilitate dispersal (Welker et al., 2019). Known chromosome counts for several species are 2n = 20, consistent with x = 10 (Gould, 1966).

Species richness is highest in open, fire-prone systems; African taxa include S. sanguineum (reticulated vein grass), and S. jeffreysii is endemic to coastal sands of southeast Africa (Welker et al., 2019; WFO, 2024). In the Americas, S. scoparium (little bluestem) is characteristic of North American prairies and is widely cultivated as an ornamental (Weakley & the Southern Plant Red List Initiative, 2012). Flowers are wind‑pollinated; fruit and seed morphology indicates anemochory and potential epizoochory via awns (Welker et al., 2019).

Recent phylogenies resolve Schizachyrium as monophyletic within Andropogoneae, closely allied to Bothriochloa and the DICRANUM–ARIANO clade (Teuscher et al., 2016; Soreng et al., 2017, 2023). Morphologically, it is defined by paired racemes with a conspicuous pedicellate sterile spikelet. Ongoing re-circumscriptions persist; taxonomic treatments in Europe and some temperate floras subsume Schizachyrium under Andropogon sensu lato (Danihelka & Štěpánek, 2004; Darbyshire et al., 2015). Welker et al. (2019) document synonymization of earlier segregates and reassessment of several African taxa. Polythetic generic boundaries in subtribe Schizachyriinae remain debated (Teuscher et al., 2016).

Human relevance is chiefly horticultural and ecological. S. scoparium is a popular ornamental for xeriscapes and prairie restoration, while S. sanguineum is important forage (Welker et al., 2019; WFO, 2024). Few taxa are regarded as invasive (GBIF, 2024). Conservation status varies locally, but broad threats include habitat conversion and altered fire regimes. Better resolution of phylogeny and taxonomy—particularly for tropical African species—will refine species limits and inform management (Welker et al., 2019; Soreng et al., 2023).

Pick a Species to see its components: