Minuartia rossii
Minuartia yukonensis
Ross' sandwort
Yukon stitchwort
stout, woody.
stout, woody.
ascending to spreading, green or often purple, 1–3 cm, glabrous, internodes of flowering stems 0.2–1 times as long as leaves.
erect to ascending, green, 10–30 cm, minutely retrorsely pubescent proximally, flowering stems stipitate-glandular, usually densely so, internodes of flowering stems 3–5 times as long as leaves.
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.
tightly overlapping (vegetative), variably spaced (cauline), usually connate proximally, with tight, scarious to herbaceous sheath 0.5–1.8 mm;
blade straight to outwardly curved, green, flat, 3-veined abaxially, midvein more prominent than 2 lateral veins, filiform-linear, 10–18 × 0.8–1.3 mm, flexuous, margins not thickened, scarious, ciliate, often sparsely so, apex green, often with white callosity, acuminate-pungent, flat to slightly navicular, shiny, glabrous;
axillary leaves present among vegetative leaves.
solitary flowers, axillary or terminal (rarely present);
bracts absent.
3–13-flowered, open cymes;
bracts lanceolate, herbaceous.
0.1–2 cm, glabrous.
2–5 cm, densely stipitate-glandular.
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.
hypanthium cup-shaped;
sepals prominently 3-veined, lanceolate to oblong-lanceolate (herbaceous lanceolate to oblong-lanceolate), 6–8 mm, not enlarging in fruit, apex green to purplish, rounded, hooded, stipitate-glandular, especially proximally;
petals oblanceolate, 1.3–1.5 times as long as sepals, apex rounded, entire.
on stipe ca. 0.1–0.2 mm, spheric, 1.5–2.5 mm, equaling sepals.
narrowly ellipsoid, 7–10 mm, longer than sepals.
brown, suborbiculate, compression unknown, ca. 0.6 mm, obscurely reticulate.
reniform, ca. 1 mm, tuberculate.
= 58 (Russia), 60.
Minuartia rossii
Minuartia yukonensis
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.)
Minuartia yukonensis is an amphi-Beringian species, reported from two sites in the Russian Far East. Some collections of it may be labeled as Arenaria laricifolia Linnaeus, a European species to which Alaskan material has been misattributed.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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