Minuartia uniflora
Minuartia dawsonensis
one-flower stitchwort
minuartie de Dawson, rock stitchwort
filiform.
filiform to somewhat thickened.
erect to ascending, green, 7–20 cm, glabrous, internodes of stems 1–7 times as long as leaves.
erect to ascending, green, 4–30 cm, glabrous, internodes of flowering stems 1–10 times as long as leaves.
not overlapping, connate proximally, with tight, herbaceous or scarious sheath 0.1–0.3 mm;
blade straight to outwardly curved, widely spreading, green, flat, 1-veined abaxially, especially proximal, narrowly lanceolate to oblong, commonly linear, 2–20 × 0.3–1.5 mm, flexuous, margins not thickened, scarious, smooth, apex green to purple, rounded to acute, dull, glabrous;
axillary leaves poorly developed.
overlapping or crowded proximally, variably spaced distally, connate proximally, with tight, scarious to herbaceous sheath 0.2–0.5 mm;
blade straight to slightly outwardly curved, green, flat, 1-veined, occasionally 3-veined abaxially, linear to subulate, 4–15 × 0.5–2 mm, flexuous, margins not thickened, scarious, smooth, apex green or purple, mostly rounded, slightly navicular, shiny, glabrous;
axillary leaves present among proximal cauline leaves.
7–25+-flowered, open cymes;
bracts subulate to ovate, herbaceous, margins scarious.
7–15-flowered (rarely fewer), open cymes;
bracts subulate, herbaceous.
0.5–5 cm, glabrous.
0.3–2.5 cm, glabrous.
hypanthium disc-shaped;
sepals obscurely veined, ovate to elliptic or lanceolate (herbaceous portion elliptic to lanceolate), 2–3.5 mm, not enlarging in fruit, apex green, obtuse to rounded, not hooded, glabrous;
petals oblanceolate to spatulate, 1.5–2.5 times as long as sepals, apex rounded, entire to shallowly notched.
hypanthium disc-shaped;
sepals prominently 3-veined, ovate to broadly lanceolate (herbaceous portion ovate to broadly lanceolate), 2.5–3.2 mm, to 4 mm in fruit, apex green to purple, acute to apiculate, not hooded, glabrous;
petals lancolate to spatulate, 0.5–0.8 times as long as sepals, apex rounded, entire, or petals absent.
on stipe shorter than 0.1 mm, pyramidal-ovoid, 3.5–4 mm, longer than sepals.
on stipe ca. 0.2 mm, ovoid, 3.5–4.5 mm, longer than sepals.
yellowish brown, suborbiculate with radicle obscure, slightly compressed, 0.4–0.6 mm, tuberculate;
tubercles low, rounded.
dark brown to black, suborbiculate with radicle prolonged into tiny beak, 0.5–0.6 mm, tuberculate;
tubercles low, rounded, somewhat elongate.
= 14.
= 30, 60.
Minuartia uniflora
Minuartia dawsonensis
Minuartia alabamensis was originally described to accommodate much-reduced plants from Alabama (J. F. McCormick et al. 1971). Subsequent studies have shown them to be conspecific with M. uniflora (R. Wyatt 1984).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Although sometimes included in Minuartia michauxii [e.g., H. J. Scoggan’s (1978–1979, part 3) treatment of Arenaria stricta], M. dawsonensis is more closely related to the circumpolar M. stricta.
Minuartia litorea, known from Quebec and Ontario, may deserve recognition. An unpublished chromosome count suggests that it is a recent allopolyploid derived from M. dawsonensis and M. rubella (L. Brouillet, pers. comm.).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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