Minuartia uniflora
Minuartia rossii
one-flower stitchwort
Ross' sandwort
filiform.
stout, woody.
erect to ascending, green, 7–20 cm, glabrous, internodes of stems 1–7 times as long as leaves.
ascending to spreading, green or often purple, 1–3 cm, glabrous, internodes of flowering stems 0.2–1 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, ± tightly (vegetative), ± evenly spaced proximally (cauline), connate-perfoliate proximally, with tight, herbaceous sheath 0.2–0.3 mm;
blade upwardly curved, green or often purple, keeled, prominently 1-veined abaxially, subulate, 3-angled, 1–4 × 0.5–0.7 mm, flexuous, margins rounded, herbaceous, smooth, apex green to purple, rounded, navicular, shiny, glabrous;
axillary leaves well developed.
7–25+-flowered, open cymes;
bracts subulate to ovate, herbaceous, margins scarious.
solitary flowers, axillary or terminal (rarely present);
bracts absent.
0.5–5 cm, glabrous.
0.1–2 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 1-veined, oblong-ovate (herbaceous portion usually purple, oblong-ovate), 1.5–2.5 mm, not enlarging in fruit, apex often purple, obtuse to acuminate, navicular, not hooded, glabrous;
petals obovate to spatulate, 1.5–2 times as long as sepals, apex obtuse, entire.
on stipe shorter than 0.1 mm, pyramidal-ovoid, 3.5–4 mm, longer than sepals.
on stipe ca. 0.1–0.2 mm, spheric, 1.5–2.5 mm, equaling sepals.
yellowish brown, suborbiculate with radicle obscure, slightly compressed, 0.4–0.6 mm, tuberculate;
tubercles low, rounded.
brown, suborbiculate, compression unknown, ca. 0.6 mm, obscurely reticulate.
= 14.
= 58 (Russia), 60.
Minuartia uniflora
Minuartia rossii
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.)
Minuartia rossii is the northernmost member of the M. rossii complex (S. J. Wolf et al. 1979; B. Maguire 1958), a pulvinate species of moist arctic areas. While specimens occasionally have many flowers, some specimens have few if any, instead reproducing via small axillary fascicles of leaves or short shoots in the upper leaf axils (see also Ö. Nilsson 2001).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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