Alternanthera flavescens

Kunth in A. von Humboldt et al.

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

Common names: Yellow joyweed
Introduced
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

Distribution

V4 879-distribution-map.gif

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

Discussion

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

Selected References

None.

Lower Taxa

None.
... more about "Alternanthera flavescens"
villous +, glabrous +  and strigose +
Steven E. Clemants +
Kunth in A. von Humboldt et al. +
1.8 cm18 mm <br />0.018 m <br /> (8 cm80 mm <br />0.08 m <br />) +
ovate +  and lanceolate or elliptic +
0.5cm;3cm +
0 (?) +  and 1/2 (?) +
Yellow joyweed +
Fla. +, Mexico +, West Indies +  and South America +
peripheral +
hypogynous +
minute +  and small +
not +  and dehiscent +
Coastal hammocks, thickets, sand bars +
several-flowered +
2.5 cm25 mm <br />0.025 m <br /> (4 cm40 mm <br />0.04 m <br />) +
yellowish white +
0.9 cm9 mm <br />0.009 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
subglobose +  and cylindric +
0.9 cm9 mm <br />0.009 m <br /> (1 cm10 mm <br />0.01 m <br />) +
subtending +
laciniate +
Flowering year-round. +
in A. von Humboldt et al., Nov. Gen. Sp. +
Introduced +
several-flowered +
cylindric +
decumbent +  and prostrate +
clambering +, ascending +  and spreading +
2-lobed +  and capitate +
0.2 cm2 mm <br />0.002 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Achyranthes ramosissima +  and Alternanthera ramosissima +
Alternanthera flavescens +
Alternanthera +
species +
distinct +
lanceolate +
0.34 cm3.4 mm <br />0.0034 m <br /> (0.47 cm4.7 mm <br />0.0047 m <br />) +
indurate +, membranaceous +, chartaceous +  and scarious +
greenish yellow +
indehiscence +
ellipsoid +
2.5 cm25 mm <br />0.025 m <br /> (?) +