Trixis inula

{{Short description|Species of flowering plant}}

{{Speciesbox

|image =

|genus = Trixis

|species = inula

|authority = Crantz

|synonyms = *Inula trixis L.

• Perdicium corymbosum Sessé & Moc. ex D.Don [Illegitimate]
• Perdicium havanense Kunth
• Perdicium laevigatum Berg
• Perdicium radiale L. [Illegitimate]
• Prenanthes fruticosa Willd. ex Less.
• Solidago fruticosa Mill.
• Tenorea berteroi Colla [Illegitimate]
• Tenorea calyculata Bertero ex Colla
• Trixis adenolepis S.F.Blake
• Trixis chiantlensis S.F.Blake
• Trixis corymbosa D.Don
• Trixis deamii B.L.Rob.
• Trixis ehrenbergii Kunze
• Trixis frutescens P.Browne ex Spreng.
• Trixis frutescens P.Browne
• Trixis frutescens var. angustifolia DC.
• Trixis frutescens var. glabrata Less.
• Trixis frutescens var. latifolia Less.
• Trixis frutescens var. obtusifolia Less.
• Trixis glabra D.Don
• Trixis havanensis (Kunth) Spreng.
• Trixis laevigata Lag.
• Trixis mexicana Moc. ex Less. [Illegitimate]
• Trixis radialis (L.) Lag. [Illegitimate]
• Trixis radialis (L.) Kuntze [Illegitimate]
• Trixis radialis var. pubescens Kuntze
• Trixis radialis var. subglabra Kuntze

|synonyms_ref = [http://www.theplantlist.org/tpl1.1/record/gcc-120610 The Plant List]

}}

Trixis inula, the tropical threefold,{{PLANTS|id=TRIN6|taxon=Trixis inula|accessdate=14 December 2015}} is a plant species native to Texas, Mexico, Central America, northern South America, and the West Indies. It is found on open, sandy sites such as roadsides, thorn scrub, thickets, etc.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250006002 Flora of North America v 19 p 75]D'Arcy, W.G. 1987. Flora of Panama. Checklist and Index. Part 1: The introduction and checklist. Monographs in systematic botany from the Missouri Botanical Garden 17: v–xxx, 1–328.Davidse, G., M. Sousa-Peña, S. Knapp & F. Chiang Cabrera. 2014. Asteraceae. 5(2): ined. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México.Nelson, C. H. 2008. Catálogo de las Plantas Vasculares de Honduras 1–1576.Idárraga-Piedrahita, A., R. D. C. Ortiz, R. Callejas Posada & M. Merello. (eds.) 2011. Flora de Antioquia: Catálogo de las Plantas Vasculares 2: 9–939. Universidad de Antioquia, Medellín.

Trixis inula is a much-branched shrub up to 300 cm (10 feet) tall. It has lanceolate to elliptic leaves up to 17 cm (7 inches) long. Yellow flower heads are borne in paniculate arrays.Crantz, Heinrich Johann Nepomuk von. Institutiones Rei Herbariae 1: 329. 1766.Anderson, C. E. 1972. A monograph of the Mexican and Central American species of Trixis (Compositae). Memoirs of the New York Botanical Garden 22(3): 1–68.[https://books.google.com/books?id=vF_1X65cDxYC&dq=Trixis+inula&pg=PA302 Richardson, A. 1995. Plants of the Rio Grande Delta. University of Texas Press, Austin.] {{ISBN|0-292-77070-7}}