Paronychia americana

(Nuttall) Fenzl ex Walpers

Repert. Bot. Syst. 1: 262. 1842.

Common names: American nailwort
Basionym: Herniaria americana Nuttall Amer. J. Sci. Arts 5: 291. 1822
Synonyms: Paronychia americana subsp. pauciflora (Small) Chaudhri Siphonychia americana Small Siphonychia pauciflora
Treatment appears in FNA Volume 5. Treatment on page 33. Mentioned on page 30, 31.

Plants annual or biennial; taproot slender. Stems erect or ascending to prostrate, branched, 5–60 cm, often retrorsely pubescent on 1 side. Leaves: stipules ovate-lanceolate, 1.5–7 mm, apex acuminate, fimbriate; blade spatulate to oblanceolate or linear-oblanceolate, 3–20 × 1–4 mm, herbaceous, apex acute to obtuse or rounded, glabrous to scaberulous. Cymes terminal, 9–25-flowered, ± compact, forming spheroid glomerules 2–6 mm wide. Flowers 5-merous, ± short-cylindric, with slightly enlarged hypanthium and calyx widening somewhat distally, 1–1.8 mm, sparsely to moderately pubescent proximally with hooked to straight hairs; sepals red-brown (sometimes finely striped or mottled), white distally, midrib obscure, obovate, 0.4–0.8 mm, leathery to rigid, margins white, 0.03–0.1 mm wide, thinly herbaceous, apex broadly rounded, hood broadly rounded, awn or mucro usually absent or minute; staminodes narrowly triangular, 0.3–0.4 mm; style 1, cleft in distal 1/6, 0.6–0.8 mm. Utricles ovoid to ellipsoid, 0.6–0.8 mm, smooth, glabrous.

Phenology: Flowering year round.
Habitat: Dunes, pine/oak woodland, fields, clearings, roadsides
Elevation: 0-300 m


Plants of Paronychia americana with fewer flowers in lax cymes from Florida and Georgia were named subsp. pauciflora, a distinction that we do not feel is worth recognition.

Selected References


Lower Taxa

... more about "Paronychia americana"
Ronald L. Hartman +, John W. Thieret +  and Richard K. Rabeler +
(Nuttall) Fenzl ex Walpers +
Herniaria americana +
American nailwort +
Ala. +, Fla. +, Ga. +  and S.C. +
0-300 m +
Dunes, pine/oak woodland, fields, clearings, roadsides +
Flowering year round. +
Repert. Bot. Syst. +
Paronychia americana subsp. pauciflora +, Siphonychia americana +  and Siphonychia pauciflora +
Paronychia americana +
Paronychia +
species +