Alternanthera brasiliana ‘Purple Knight’

Alternanthera brasiliana ‘Purple Knight’ with Sedum lineare ‘Variegatum’  (Photo taken on 7-3-12, #107-15).

Ruby Leaf, Parrot Leaf, Calico Plant, Joy Weed

Alternanthera ‘Purple Knight’

Alternanthera brasiliana


Alternanthera dentata

all-ter-NAN-ther-ah den-TAY-tah

Synonyms of Alternanthera brasiliana (27) (Updated 11-7-22): Achyranthes brasiliana (L.) Standl., Alternanthera brasiliana f. angustifolia Kuntze, Alternanthera brasiliana f. bicolor Kuntze, Alternanthera brasiliana var. glabriuscula Kuntze, Alternanthera brasiliana var. longiseta Suess., Alternanthera brasiliana f. obtusifolia Kuntze, Alternanthera brasiliana f. rubicunda Kuntze, Alternanthera brasiliana var. sericea Kuntze, Alternanthera brasiliana var. straminea (Mart.) Suess., Alternanthera dentata Scheygr.Alternanthera dentata f. pubescens Suess., Alternanthera dentata f. rubiginosa Suess., Alternanthera moquinii var. grandiceps Suess., Alternanthera straminea (Mart.) Suess., Caraxeron brasiliense Raf., Gomphrena brasiliana L., Gomphrena brasiliensis L., Gomphrena brasiliensis Jacq., Gomphrena dentata Moench, Mogiphanes brasiliensis Mart., Mogiphanes straminea Mart., Philoxerus brasiliana (L.) Sm., Philoxerus brasiliensis (L.) R.Br. ex Sweet, Psilotrichum malaccense Suess., Telanthera brasiliana (L.) Moq., Telanthera brasiliensis Endl., Telanthera dentata Moq.

Alternanthera brasiliana (L.) Kuntze is the correct and accepted name for this species of Alternanthera. It was named and described by Carl Ernst Otto Kuntz in Revisio Generum Plantarum in 1891. This species was first named Gomphrena brasiliana by Carl von Linnaeus and was described in Centuria II Plantarum in 1756.

The most commonly used synonym,  Alternanthera dentata (Moench) Scheygrond was named and described by *Arie Scheygrond in Flora of Suriname in 1932. It was earlier described as Alternanthera dentata (Moench) Stuchlík ex R.E.Fr. by Jaroslav Stuchlík then by Klas Robert Elias Fries in Repertorium Specierum Novarum Regni Vegetabilis in 1913 giving credit to Stuchlík’s description. I don’t know why this earlier description was invalid… The basionym was Gomphrena dentata Moench as named and described by Conrad Moench in Supplementum ad Methodum in 1802.

*The link to Arie Scheygrond is in German, so you will need to use Google translator (just type in “translate German to English” and you will find it easily).

Although Alternanthera brasiliana (L.) Kuntze is the official correct and accepted scientific name there are many websites that are still using Alternanthera dentata. Umm… Including the Missouri Botanical Garden Plant Finder. They also list Alternanthera brasiliana ‘Purple Prince’.  Apparently, they didn’t, or haven’t updated the name. Tropicos, a database that is a division of the Missouri Botanical Garden, lists Alternanthera dentata as one of 54 synonyms of Alternanthera brasiliana. Most websites using Alternanthera dentata are online sources of plants. 

As of 11-7-22 when this page was last updated, Plants of the World Online lists 111 species in the Alternanthera genus. It is a member of the plant family Amaranthaceae with 183 genera. Those numbers could change as updates are made on POWO.

I first grew this plant in 2008 while living with my brother in St. Paul, Minnesota. It grew HUGE and I brought it inside for the winter where it continued to grow and even flowered. After seeing the flowers, you would realize why Linnaeus put the species in the genus Gomphrena. The flowers look exactly like the Gomphrena I have grown. Alternanthera brasiliana flowers very late, so unfortunately many people who grow them don’t get to see the flowers. 

Alternanthera brasiliana 'Purple Knight' cuttings on 10-8-12 (#120-1)

Alternanthera brasiliana ‘Purple Knight’ cuttings on 10-8-12 (#120-1).

Family: Amaranthaceae
Origin: Parts of Mexico, Central and South America, West Indies….
Zones: USDA Zones 10-11. Usually grown as an annual or houseplant
Size: 18-36” tall. Can be trimmed to suit.
Light: Sun to part shade
Soil: Average well-drained soil or potting mix
Water: Average. Prefers moist soil. If grown in pots, water at least when the top 4″ of the soil becomes dry.

In more light, the leaves are a dark maroon but in more shade, they are greener. These plants also need a little trimming as they will become leggy. Cut them back once in a while and they will keep a nice bushy shape. Cuttings easily take root, too. I had some growing and ready in the sunroom when I had to give them away and move to Missouri in February 2013.

There are several common names for this plant including Ruby Leaf, Parrot Leaf, Calico Plant and Joy Weed but I just called it Alternanthera. ‘Purple Knight’s is the cultivar name for the plants I have grown. Other cultivar names include ‘Red Marble’, Gail’s Choice’, ‘Rubiginosa’, ‘Royal Tapestry’, ‘Little Ruby’, and probably others.

As an herb, this plant was used in Brazilian medicine for inflammation, cough, and diarrhea. Its wound-healing ability has also been studied.

I have not seen any of these plants at any of the local greenhouses or garden centers since I moved back to Missouri. What a shame since this is a very good plant to grow in flower beds and containers. They are available online as plants and seeds.

I hope you enjoyed this page and maybe found it useful. If you have any comments, questions, or suggestions, I would like to hear from you. Please click on “like” if you visited this page. It helps us bloggers stay motivated. 🙂 You can check out the links below for further reading. The links take you directly to the genus and species of this plant. If you see I have made an error, please leave a comment. You can also email me at


2 comments on “Alternanthera brasiliana ‘Purple Knight’

  1. Michele DiPaula says:

    Loved your page

    Liked by 1 person

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