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.
Revision as of 23:26, 16 December 2019 by FNA>Volume Importer

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


V4 884-distribution-map.gif

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.

Selected References


Lower Taxa


... more about "Alternanthera sessilis"
Steven E. Clemants +
(Linnaeus) R. Brown ex de Candolle +
Gomphrena sessilis +
Sessile joyweed +
Ala. +, Fla. +, Ga. +, La. +, Mexico +, West Indies +, Central America (Belize +, Costa Rica +, Guatemala +, Nicaragua +, Panama) +, South America +, Africa +  and Asia. +
0-20 m +
Wet disturbed areas +
Flowering summer–early fall. +
Cat. Pl. Hort. Monsp., +
Alternanthera sessilis +
Alternanthera +
species +