Amaranthus tricolor L.
  • Sp. Pl.
  • Joseph’s coat, summer poinsettia


This taxon is accepted by Amaranthaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Description

Stem green or red, 80-150 cm tall, stout, often branched. Petiole green or red, 2-6 cm; leaf blade green, red, purple, or yellow, ovate, ovate-rhombic, or lanceolate, 4-10 × 2-7 cm, glabrous, base cuneate, margin entire or undulate, apex obtuse or notched, with a mucro. Flowers in dense clusters at leaf axils or in spike at apex; male and female flowers in same inflorescences. Bracts and bracteoles ovate-lanceolate, 2.5-3 mm, transparent, apex long pointed. Stamens 3. Stigmas 3. Utricles included in perianth, ovate-oblong, 2-2.5 mm, circumscissile. Seeds brownish black, subglobose or obovoid, ca. 1 mm in diam. Fl. May-Aug, fr. Jul-Sep. 2n = 34*, 68, 85*.

Plants annual, glabrous. Stems erect, often branched, 0.8-1.5 m. Leaves: petiole 1/2 as long as blade; blade ovate, elliptic, rhombic, or lanceolate, mostly 4-12 × 1.4-6 cm, base tapering, margins entire, usually undulate, apex acuminate and short-mucronate; distal leaf blades green, red, scarlet, maroon, purple, yellow, and cream (unique to A. tricolor). Inflorescences axillary glomerules. Bracts of pistillate flowers ovate to lanceolate, 5-6 mm. Pistillate flowers: tepals 3, narrowly ovate to lanceolate, 5-6 mm, apex aristate; style branches spreading; stigmas 2-3. Staminate flowers intermixed with pistillate; tepals 3; stamens 3. Utricles ovoid, 2-2.5 mm, rugose, dehiscence regularly circumscissile. Seeds black or brownish black, subglobose, 1 mm diam., shiny.

Morphology

Erect herb, 2–6 ft. high; leaves, stems and flowers green or red

Common Names

NameLanguage
Joseph’s coat, summer poinsettia

 Information From

Amaranthaceae
World Flora Online Data. 2017.
  • A CC0 1.0 Universal (CC0 1.0).
Flora Of CHina @ efloras.org
http://www.efloras.org/flora_page.aspx?flora_id=2
'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • B Missouri Botanical Garden
Plants Of the World Online Portal
https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
http://www.plantsoftheworldonline.org/terms-and-conditions
  • C The Trustees of the Royal Botanic Gardens, Kew
Flora of North America @ efloras.org
http://www.efloras.org/flora_page.aspx?flora_id=1
'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • D Flora of North America Association
World Flora Online consortium
http://www.worldfloraonline.org/organisation/WFO
World Flora Online Data. 2018.
  • E CC0 1.0 Universal (CC0 1.0).