Alternanthera flavescens


in A. von Humboldt et al., Nov. Gen. Sp. 2: 207. 1818.

Common names: Yellow joyweed
Synonyms: Achyranthes ramosissima (Martius) Standley Alternanthera ramosissima (Martius) Chodat
Treatment appears in FNA Volume 4. Treatment on page 448.

Herbs, perennial, 6–15 dm. Stems ascending to spreading, often clambering, pubescent, glabrate. Leaves sessile; blade ovate to lanceolate or elliptic, 1.8–8 × 0.5–3 cm, herbaceous, apex long-acuminate or acute, sparsely strigose or glabrous. Inflorescences terminal and axillary, pedunculate; heads yellowish white, subglobose to cylindric, 0.9–2.5(–4) × 0.9–1 cm; bracts keeled, less than 1/2 as long as tepals. Flowers: tepals monomorphic, green, lanceolate, 3.4–4.7 mm, apex acute, villous, hairs not barbed; stamens 5; pseudostaminodes ligulate, margins laciniate. Utricles included within tepals, greenish yellow, ellipsoid, 2.5 mm, apex acute. Seeds ovoid, 1.2–1.3 mm.

Phenology: Flowering year-round.
Habitat: Coastal hammocks, thickets, sand bars
Elevation: 0 m


V4 879-distribution-map.gif

Introduced; Fla., Mexico, West Indies, South America.


Alternanthera flavescens has long been known as A. ramosissima (Martius) Standley.

Selected References


Lower Taxa

... more about "Alternanthera flavescens"
Steven E. Clemants +
Yellow joyweed +
Fla. +, Mexico +, West Indies +  and South America. +
Coastal hammocks, thickets, sand bars +
Flowering year-round. +
in A. von Humboldt et al., Nov. Gen. Sp. +
Introduced +
Achyranthes ramosissima +  and Alternanthera ramosissima +
Alternanthera flavescens +
Alternanthera +
species +