Panicum virgatum L.
  • Sp. Pl.
  • switchgrass

Cite taxon page as 'WFO (2021): Panicum virgatum L. Published on the Internet; Accessed on: 09 Dec 2021'

General Information

Perennial with scaly rhizomes. Culms tough, erect, 60–200 cm tall, usually unbranched, nodes glabrous or pubescent. Leaves basal and cauline; leaf sheaths rounded, glabrous; leaf blades linear, flat, 20–40 × 0.3–1.5 cm, glabrous, apex acuminate; ligule 1.5–7 mm, a ciliate fringe, membranous at the base. Panicle open, oblong or rhomboid in outline, 15–55 cm, the spikelets often clustered on the secondary branches. Spikelets ovate, 3–5 mm, glabrous; glumes ovate, acuminate; lower glume 2/3–3/4 length of spikelet, 5-veined; upper glume as long as spikelet, 5-veined; lower floret staminate, lemma similar to upper glume, 5–7-veined, palea well developed; upper floret pale, shiny. Fl. and fr. Jul–Oct. 2n = 21, 25, 30, 32, 36, 72.

  • Provided by: [D].Flora Of CHina @
    • Source: [
    • 2
    • ]. 

    13. Panicum virgatum L., Sp. Pl. 59 (1753). Lectotipo (designado por Hitchcock, 1908): Estados Unidos, Clayton 578 (LINN-80.61).

    Por G. Davidse.

    Panicum ichnanthoides Fourn.

    Plantas rizomatosas. Tallos 100-200 cm, erectos, generalmente simples; entrenudos y nudos glabros. Vainas ciliadas, generalmente glabras, a veces pelosas; membrana ligular 0.3-0.8 mm, los cilios 1.5-3.5 mm; láminas 10-60 cm x 3-15 mm, lineares, aplanadas, generalmente glabras y pilosas en el haz en la base, a veces pelosas, ligeramente angostadas en la base. Panículas 15-50 cm, terminales; ramas 6-20 cm, solitarias o pareadas, escabrosas, patentes. Espiguillas 3.4-4 mm, solitarias, adpresas, ovoides, glabras; gluma inferior 1.8-3.2 mm, 2/3-3/ 4 del largo de la espiguilla, amplexicaule, 5-nervia, acuminada; gluma superior tan larga como la espiguilla, 5-7-nervia, acuminada; flósculo inferior estaminado; lema inferior ligeramente más corta que la gluma superior, 5-7-nervia, acuminada; pálea inferior 3/4 a casi tan larga como la lema inferior; anteras 1-2.9 mm; flósculo superior 2.3-2.5 x 0.9-1.1 mm, liso, brillante, glabro, subagudo, sésil; anteras 1.7-1.8 mm. Sabanas, claros graminosos en bosques de Pinus-Quercus. Ch (Davidse y Davidse 9396, MO). 0-1400 m. (S. Canadá a Chiapas, Cuba, Bermuda; introducida en Argentina.)

    Panicum ichnanthoides era considerado (Hitchcock y Chase, 1915) distinto del ampliamente distribuido y variable P. virgatum en sus inflorescencias más angostas y la ausencia de rizomas largos y reptantes. Sin embargo, P. ichnanthoides posee rizomas cortos escamosos similares a los de poblaciones mexicanas y algunas norteamericanas de P. virgatum, y su tipo de inflorescencia puede también ser ocasionalmente visto en P. virgatum.

  • Provided by: [E].Flora Mesoamericana
    • Source: [
    • 3
    • 1
    • ]. 

    "Stout, erect, to 2 m, from hard, scaly rhizomes, often forming large tufts; ligule a dense zone of silky hairs; blades 2–5 dm, to 15 mm wide; glabrous or pilose near the base; infl open, freely branched, pyramidal, 2–4 dm; spikelets ovoid, soon widened distally by spreading of the glumes and sterile lemma, 2.2–5.6 mm; first glume half to nearly as long; second glume and sterile lemma subequal, conspicuously veined, acute to long-acuminate; 2n=18–108. Open woods, prairies, dunes, shores, and brackish marshes; N.S. and Que. to Man. and Mont., s. to Ariz., Mex"

  • Provided by: [C].New York Botanical Garden
    • Source: [
    • 4
    • ]. 

    Distribution Map

    • Introduced distribution
    Introduced into
    • Southern America Brazil Parí
    • Bahia
    • São Paulo

    Other Local Names


     Information From

    MBG Floras Images
    Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
    • A Missouri Botanical Garden
    Brazilian Flora 2020 project - Projeto Flora do Brasil 2020
    Brazil Flora G (2014): Brazilian Flora 2020 project - Projeto Flora do Brasil 2020. v393.147. Instituto de Pesquisas Jardim Botanico do Rio de Janeiro. Dataset/Checklist. doi:10.15468/1mtkaw
    • B Group Brazil Flora, REFLORA Program
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • C Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    Flora Of CHina @
    'Flora of China @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • D Missouri Botanical Garden
    Flora Mesoamericana
    Gerrit Davidse, Mario Sousa Sánchez, A. O. Chater, Universidad Nacional Autónoma de México. Instituto de Biología, Missouri Botanical Garden, Natural History Museum (London, England) UNAM, 1994
    • E Missouri Botanical Garden
    • F CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    World Flora Online Data. 2018.
    • G CC0 1.0 Universal (CC0 1.0).