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Rugel's nailwort, sand squares

Habit Plants annual; taproot filiform to slender.

erect, dichotomously branched, 5–50 cm, retrorsely to spreading- pubescent throughout.


stipules ovate-lanceolate, 2–6 mm, apex acuminate, entire;

blade linear to linear-oblanceolate or linear-oblong, 3–25 × 1–2.3 mm, herbaceous, apex ± acute, moderately antrorsely puberulent.


5-merous, cylindric to narrowly lanceolate, with enlarged hypanthium and calyx cylindric to tapering distally, 2.3–3.5 mm, pubescent mostly proximal with hooked or usually straight hairs, sometimes with scattered straight hairs distally;

sepals flecked or solid red-brown, white distally, midrib obscure, linear-lanceolate, 1.5–2 mm, papery, margins white, 0.1–0.2 mm wide, papery, apex terminated by mucro, hood obscure, narrowly rounded, mucro short-conic, ca. 0.1 mm, glabrous;

staminodes filiform, widening proximally, 0.5–0.6 mm;

style 1, cleft in distal 1/10.


terminal and lateral, 15–50+-flowered, often forming large, congested clusters 5–30 mm wide.


broadly ellipsoid to ± globose, 0.5–0.7 mm, smooth, glabrous.

Paronychia rugelii

Phenology Flowering late spring–fall.
Habitat Woodlands, fields, clearings, roadsides, waste places
Elevation 0-200 m [0-700 ft]

Of conservation concern.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

from FNA
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Parent taxa Caryophyllaceae > subfam. Paronychioideae > Paronychia
Sibling taxa
P. ahartii, P. americana, P. argyrocoma, P. baldwinii, P. canadensis, P. chartacea, P. congesta, P. depressa, P. drummondii, P. echinulata, P. erecta, P. fastigiata, P. franciscana, P. herniarioides, P. jamesii, P. jonesii, P. lindheimeri, P. maccartii, P. monticola, P. patula, P. pulvinata, P. sessiliflora, P. setacea, P. virginica, P. wilkinsonii
Synonyms Siphonychia rugelii, Gibbesia rugelii, Odontonychia interior, P. rugelii var. interior, Siphonychia interior
Name authority (Chapman) Shuttleworth ex Chapman: Fl. South. U.S. ed. 3, 397. (1897)
Source Flora of North America vol. 5, p. 41.
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