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Rocky Mountain nailwort

Wilkinson's nailwort

Habit Plants perennial, densely cespitose, cushion-forming; caudex much-branched, woody. Plants perennial, cushion-forming, hirtellous; caudex much-branched, woody.
Stems

prostrate, much-branched, 5–10 cm, puberulent.

erect to ascending, much-branched, 4–10 cm, hirtellous.

Leaves

stipules ovate, 3–6 mm, apex subobtuse, entire;

blade narrowly elliptic-oblong or oblong to narrowly elliptic-oblanceolate, 2–5 × 0.2–1.8(–2) mm, fleshy, apex obtuse to subacute, glabrous.

stipules lanceolate, 5–8 mm, apex acuminate, often deeply cleft;

blade lanceolate, 5–9 × 0.75–1.1 mm, leathery, apex pungently mucronate, minutely hirtellous to puberulent.

Flowers

mostly solitary at end of shoots, almost concealed by leaves.;

flowers 5-merous, elliptic-oblong, with enlarged hypanthium and calyx straight to tapering distally, 2.5–2.8 mm, densely appressed-puberulent, sparsely so distally;

sepals whitish to green, veins absent, narrowly oblong to ovate-oblong, 1.5–1.7 mm, papery to herbaceous, margins white, 0.2–0.3 mm wide, papery, apex with subterminal awn, hood ascending as continuation of sepal, broadly rounded to notched, awn erect, white, 0.3–0.6(–1) mm, ± glabrous spine;

staminodes filiform, 0.7–0.9 mm;

style 1, cleft in distal 1/3, 0.8–1 mm.

5-merous, ± short-campanulate, with enlarged hypanthium and calyx slightly constricted then widening distally, 3.3–4.5 mm, puberulent with mostly ascending hairs;

sepals red-brown, midrib and lateral pair of veins absent to evident, oblong, 1.7–2 mm, leathery to rigid, margins white, 0.2–0.3 mm wide, papery to scarious, apex terminated by awn, hood ± obscure, broadly rounded, awn moderately divergent, white, ± lanceoloid, 1.4–2.1 mm, scabrous, distinct spine absent;

staminodes ± triangular, 0.2–0.4 mm;

styles 2, 0.5–0.7 mm.

Utricles

ovoid, 1.3–1.5 mm, smooth, glabrous.

subglobose to ± 4-angular, 1.2–1.3 mm, papillate distally.

Cymes

terminal and subterminal, 3–7(–10)-flowered, densely congested, forming large and conspicuous glomerules 5–15 mm wide.

2n

= 32.

Paronychia pulvinata

Paronychia wilkinsonii

Phenology Flowering summer. Flowering spring–fall.
Habitat Rocky slopes and summit screes in alpine regions Dry, rocky hills, gravelly slopes and summits
Elevation 3300-4200 m (10800-13800 ft) 1200-1600 m. (3900-5200 ft.)
Distribution
from FNA
CO; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Chihuahua, Coahuila)
[BONAP county map]
Discussion

Of conservation concern.

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

Source FNA vol. 5, p. 40. FNA vol. 5, p. 43.
Parent taxa Caryophyllaceae > subfam. Paronychioideae > Paronychia 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. rugelii, P. sessiliflora, P. setacea, P. virginica, P. wilkinsonii
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. rugelii, P. sessiliflora, P. setacea, P. virginica
Synonyms P. pulvinata var. longiaristata
Name authority A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 58. (1864) S. Watson: Proc. Amer. Acad. Arts 21: 454. (1886)
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