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Rocky Mountain nailwort

bristle nailwort

Habit Plants perennial, densely cespitose, cushion-forming; caudex much-branched, woody. Plants annual, biennial, or perennial; taproot filiform to slender.
Stems

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

erect to ascending, much-branched distally, 5–20 cm, finely pubescent to puberulent.

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, 3–8 mm, apex acuminate, entire;

blade linear, 5–20 × 0.3–1 mm, leathery, apex minutely cuspidate, glabrous.

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 widening distally, 2.4–3.2 mm, moderately pubescent proximately with antrorsely appressed to spreading hairs;

sepals green to tan, midrib and lateral pair of veins absent to evident, oblong, 1.2–1.3 mm, leathery to rigid, margins whitish to translucent, 0.05–0.1 mm wide, scarious, apex terminated by awn, hood ± obscure, narrowly rounded, awn widely divergent, 0.6–1.3 mm, broadly conic in proximal 1/3 with white to yellowish, scabrous spine;

staminodes subulate, 0.6–0.7 mm;

style 1, cleft in distal 1/2, 0.4–0.6 mm.

Utricles

ovoid, 1.3–1.5 mm, smooth, glabrous.

ovoid-oblong, 1 mm, smooth, glabrous.

Cymes

terminal and lateral, 5–20+-flowered, dichasial and rather diffuse, forming clusters 3–15 mm wide.

2n

= 32.

= 64.

Paronychia pulvinata

Paronychia setacea

Phenology Flowering summer. Flowering spring–fall.
Habitat Rocky slopes and summit screes in alpine regions Limestone barrens, gravelly or sandy slopes and grasslands
Elevation 3300-4200 m (10800-13800 ft) 30-200 m (100-700 ft)
Distribution
from FNA
CO; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
TX
[BONAP county map]
Discussion

We could not distinguish Paronychia lundellorum from P. setacea based on features that Turner used for differentiation, nor did we discover any other discriminating characters. The former was described as perennial (versus annual for the latter) and as having “decided pedicellate” (versus sessile) and longer flowers. Recent data (W. Carr, pers. comm.) indicate that it does bloom in the first year. Furthermore, we have observed that the pedicel character is inconsistent and the flower lengths overlap extensively. Further study of the allopatric populations named P. lundellorum is warranted.

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

Source FNA vol. 5, p. 40. FNA vol. 5, p. 42.
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. virginica, P. wilkinsonii
Synonyms P. pulvinata var. longiaristata P. lundellorum, P. setacea var. longibracteata
Name authority A. Gray: Proc. Acad. Nat. Sci. Philadelphia 15: 58. (1864) Torrey & A. Gray: Fl. N. Amer. 1: 170. (1838)
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