Alternanthera sessilis

(Linnaeus) R. Brown ex de Candolle

Cat. Pl. Hort. Monsp.,77. 1813

Common names: Sessile joyweed
Basionyms: Gomphrena sessilis Linnaeus Sp. Pl. 1: 225. 1753
Treatment appears in FNA Volume 4. Treatment on page 450. Mentioned on page 448, 449.
Error creating thumbnail: Unable to save thumbnail to destination
Herbs, annual or perennial, 2–6 dm. Stems procumbent, pubescent in lines, glabrate. Leaves sessile; blade elliptic to oblong or oblanceolate, 1.2–5 × 0.5–2.2 cm, apex obtuse to acute, glabrous. Inflorescences axillary, sessile; heads white, subglobose or ovoid, 0.5–1.1 cm; bracts keeled, ca. 1/2 as long as tepals. Flowers: tepals white, ovate to lanceolate, 2–3.5 mm, apex acuminate, hairs not barbed; stamens 5; anthers 3–5, globose; pseudostaminodes subulate, margins laciniate. Utricles included within tepals, sides exerted in mature fruit, greenish stramineous, obcordate, 1.3–1.7 mm, apex retuse. Seeds lenticular, 0.9–1.1 mm.

Phenology: Flowering summer–early fall.
Habitat: Wet disturbed areas
Elevation: 0-20 m


Error creating thumbnail: Unable to save thumbnail to destination

Ala., Fla., Ga., La., Mexico, West Indies, Central America (Belize, Costa Rica, Guatemala, Nicaragua, Panama), South America, Africa, Asia.


Alternanthera sessilis is reported from Maryland, Mississippi, South Carolina, and Texas, but I have seen no specimens from these states.



Lower Taxa

No lower taxa listed.

AuthorSteven E. Clemants +
Authority(Linnaeus) R. Brown ex de Candolle +
BasionymsGomphrena sessilis +
Common nameSessile joyweed +
DistributionAla. +, Fla. +, Ga. +, La. +, Mexico +, West Indies +, Central America (Belize +, Costa Rica +, Guatemala +, Nicaragua +, Panama) +, South America +, Africa + and Asia. +
Elevation0-20 m +
HabitatWet disturbed areas +
Illustration copyrightFlora of North America Association +
IllustratorYevonn Wilson-Ramsey +
Introducedtrue +
PhenologyFlowering summer–early fall. +
Publication titleCat. Pl. Hort. Monsp., +
Publication year1813 +
ReferenceNone +
Source xml grained fna xml/V4/V4 884.xml +
Taxon familyAmaranthaceae +
Taxon nameAlternanthera sessilis +
Taxon parentAlternanthera +
Taxon rankspecies +
VolumeVolume 4 +