Minuartia uniflora
Minuartia austromontana
one-flower stitchwort
Columbian stitchwort, Rocky Mountain sandwort
filiform.
moderately stout, not woody.
erect to ascending, green, 7–20 cm, glabrous, internodes of stems 1–7 times as long as leaves.
spreading to erect, cespitose, green, 3–15 cm, glabrous, internodes of all stems 0.2–0.6 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.
tightly overlapping, usually connate proximally, with ± loose, scarious to herbaceous sheath 0.2–0.8 mm;
blade straight to outwardly curved, green, flat, prominently 1-veined abaxially, linear to subulate, 3–10 × 0.1–1 mm, flexuous, margins not thickened, scarious, smooth, apex green or purple, rounded, navicular, shiny, glabrous;
axillary leaves present among cauline leaves.
7–25+-flowered, open cymes;
bracts subulate to ovate, herbaceous, margins scarious.
flowers solitary, terminal;
bracts linear to subulate, herbaceous.
0.5–5 cm, glabrous.
0.3–1.5(–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 prominently 3-veined, linear to lanceolate (herbaceous portion linear to lanceolate), 2–3 mm, enlarging slightly in fruit, apex usually purple, acute or rounded, not hooded, glabrous;
petals usually absent, if present, rudimentary, linear to oblong, shorter than sepals, apex entire.
on stipe shorter than 0.1 mm, pyramidal-ovoid, 3.5–4 mm, longer than sepals.
ellipsoid, 2–3 mm, equaling sepals.
yellowish brown, suborbiculate with radicle obscure, slightly compressed, 0.4–0.6 mm, tuberculate;
tubercles low, rounded.
0.6–1 mm, brown, suborbiculate with radicle prolonged into beak, somewhat compressed, minutely tuberculate (50x).
= 14.
= 30.
Minuartia uniflora
Minuartia austromontana
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 austromontana is the Rocky Mountains member of the M. rossii complex (S. J. Wolf et al. 1979). Specimens from that region identified as M. rossii subsp. columbiana (Raup) Maguire are probably M. austromontana; contrary to B. Maguire’s (1958) interpretation, the former is a synonym of M. elegans.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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