Minuartia uniflora
Minuartia douglasii
one-flower stitchwort
Douglas' sandwort, Douglas' 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 widely spreading, green or purple, 4–30 cm, stipitate-glandular distally, internodes of all stems 1–5 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.
sometimes overlapping proximally, ± evenly spaced, connate proximally, with loose, scarious sheath 0.3–0.7 mm;
blade straight to variously curved or coiled, green or purple, concave, 1–3 veined, linear, 5–40 × 0.2–0.4 mm, flexuous, margins not thickened, often scarious, sometimes ciliate or stipitate-glandular, apex green to purple, acute, navicular, dull, glabrous to stipitate-glandular;
axillary leaves present proximally.
7–25+-flowered, open cymes;
bracts subulate to ovate, herbaceous, margins scarious.
7–15+-flowered, open cymes;
bracts subulate, scarious.
0.5–5 cm, glabrous.
0.2–4 cm, stipitate-glandular.
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(–3)-veined, midvein often more prominent than lateral veins, ± ovate (herbaceous portion lanceolate to oblong-lanceolate to narrowly ovate), 2.5–3.7 mm, not enlarging in fruit, apex often purple, obtuse to acute, not hooded, stipitate-glandular at least proximally;
petals ovate, (1–)1.7–2.1 times as long as sepals, apex broadly rounded, entire or irregularly dentate.
on stipe shorter than 0.1 mm, pyramidal-ovoid, 3.5–4 mm, longer than sepals.
on stipe 0.3–0.5 mm, broadly ovoid, 4 mm, longer than sepals.
yellowish brown, suborbiculate with radicle obscure, slightly compressed, 0.4–0.6 mm, tuberculate;
tubercles low, rounded.
reddish brown, winged, orbiculate with radicle not prolonged, compressed, 1.3–2 mm, tuberculate;
tubercles low, elongate.
= 14.
Minuartia uniflora
Minuartia douglasii
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.)
The winglike margins on the seeds of Minuartia douglasii are unique among North American members of the genus; M. howellii and M. tenella, the other members of sect. Greniera (Gay) Mattfeld, do not share this feature.
Plants with petal apices usually emarginate rather than entire and obtuse and often shorter than in typical plants have been recognized by some as var. emarginata.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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