Achyranthes aspera

Linnaeus

Sp. Pl. 1: 204. 1753

Synonyms: Centrostachys aspera (Linnaeus) Standley
Treatment appears in FNA Volume 4. Treatment on page 436. Mentioned on page 435.
Plants perennial or annual. Stems 0.4–2 m, pilose or puberulent. Leaf blades elliptic, ovate, or broadly ovate to orbiculate, obovate-orbiculate, or broadly rhombate, 1–20 × 2–6 cm, adpressed-pubescent abaxially and adaxially. Inflorescences to 30 cm; bracts membranous; bracteoles long-aristate, spinose; wings attached at sides and base. Flowers: tepals 4 or 5, length 3–7 mm; pseudostaminodes with margins fimbriate at apex, often with dorsal scale. Utricles ± cylindric, 2–4 mm, apex truncate or depressed.

Distribution

V4 854-distribution-map.gif

se United States, Mexico, West Indies, Central America, South America, Eurasia, Africa.

Discussion

Varieties 6 (2 in the flora).

Achyranthes aspera is a variable, pantropical species divided into six varieties (C. C. Townsend 1974), two of which occur in the flora. The variety with a long perianth and acuminate leaves has long been called </i>var.<i> aspera; the variety with a short perianth and blunt leaves, </i>var.<i> indica. However, A. Cavaco (1962) showed that the type of </i>var.<i> indica must be the type of the species A. aspera, thus </i>var.<i> indica is a homotypic synonym of </i>var.<i> aspera. Townsend made the combination A. aspera var. pubescens for plants previously called </i>var.<i> aspera.

References

None.

Key

1 Leaf blades elliptic, ovate, or broadly ovate, apex acuminate; tepals 6-7 mm Achyranthes aspera var. pubescens
1 Leaf blades orbiculate, obovate-orbiculate, or broadly rhombate, apex rounded, apiculate; tepals 3-4 mm Achyranthes aspera var. aspera