Paronychia americana

(Nuttall) Fenzl ex Walpers

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

Common names: American nailwort
Endemic
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 ovatelanceolate, 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 redbrown (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

Discussion

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

None.

Lower Taxa

None.

"widening" is not a number."/10" is not declared as a valid unit of measurement for this property. "/10" is not declared as a valid unit of measurement for this property.

... more about "Paronychia americana"
awned +  and hooded +
ascending +  and slightly descending +
glabrous +  and scaberulous +
rounded;acute;obtuse or rounded +
Ronald L. Hartman +, John W. Thieret +  and Richard K. Rabeler +
(Nuttall) Fenzl ex Walpers +
prominent +
minute +
stipulate +  and petiolate +
not +  and connate +
Herniaria americana +
often +  and needlelike +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
spatulate +  and oblanceolate or linear-oblanceolate +
succulent +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
reduced +
enlarged +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
American nailwort +
9-25-flowered +
2mm;6mm +
dish--shaped +
expanded +
Ala. +, Fla. +, Ga. +  and S.C. +
0-300 m +
peripheral +
connate +  and distinct +
unisexual +  and bisexual +
short-cylindric +
sometimes +  and indehiscent +
stalked +  and simple +
Dunes, pine/oak woodland, fields, clearings, roadsides +
straight +
rounded +
tapering +  and cup-shaped +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
sessile +  and petiolate +
adjacent +  and opposite +
connate +
all +  and distalmost +
fimbriate +  and entire +
papery +  and scarious +
0.03mm +  and 0.1mm +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
leathery +  and rigid +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
fugacious +
4 +  and 5 +
Flowering year round. +
Repert. Bot. Syst. +
compressed +, subglobose +  and ellipsoid +
white +  and redbrown +
persistent +
subulate;linear-oblong lanceolate spatulate or ovate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
triangular +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (?) +  and 0.04 cm0.4 mm <br />4.0e-4 m <br /> (?) +
ascending;prostrate +
terete;angular +
5 cm50 mm <br />0.05 m <br /> (60 cm600 mm <br />0.6 m <br />) +
subterminal +
[50 +  and 2 +
papillate +
silvery +  and white +
ovatelanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
connate +  and distinct +
subcapitate +  and filiform +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
Paronychia americana subsp. pauciflora +, Siphonychia americana +  and Siphonychia pauciflora +
Paronychia americana +
Paronychia +
species +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
divided +
ovoid +  and ellipsoid +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (?) +  and 0.08 cm0.8 mm <br />8.0e-4 m <br /> (?) +
membranous +
8 (?) +  and 10 (?) +
not rhizomatous +  and taprooted +
biennial +  and annual +
pubescence of simple hairs or stalked glands +  and glabrous +
9 +, 8 +  and 7 +