Minuartia nuttallii
Minuartia nuttallii var. gregaria
brittle sandwort, musk-flower, Nuttall sandwort, Nuttall's sandwort, Nuttall's stitchwort
brittle sandwort, Nuttall sandwort
thickened, woody;
crown, many-branched, woody;
rhizomes and trailing stems to 60 cm.
ascending to erect, ± green, 2–20 cm, densely glandular-hairy throughout, internodes of flowering stems 0.2–2 times as long as leaves.
tightly appressed to spreading, ± evenly spaced, connate proximally, with ± loose, scarious sheath 0.1–0.7 mm;
blade straight to recurved, ± green, flat, prominently 1-veined abaxially, broadly lanceolate to linear, 5–20 × 0.5–1.5 mm, ± rigid, margins rounded, scarious in proximal 1/3–1/4, apex green to purple, acute to acuminate or spinescent, navicular with small mucro or spinescent, dull, stipitate-glandular;
axillary leaves present proximally to throughout.
tightly appressed to slightly arcuate-spreading;
blade 5–10 mm, apex acute to acuminate, navicular, with small mucro, not spine-tipped.
(3–)6–30-flowered, open cymes;
bracts lanceolate to subulate, usually scarious.
0.2–2 cm, stipitate-glandular.
hypanthium disc-shaped;
sepals 1–3-veined, narrowly lanceolate to lanceolate or ovate (herbaceous portion narrowly lanceolate to lanceolate or ovate), 3–6(–7) mm, not enlarging in fruit, apex often purple, acute to acuminate or spinescent, not hooded, stipitate-glandular;
petals obovate, 0.5–1.6 times as long as sepals, apex rounded, entire.
sepals 1- or 3-veined, lateral veins less distinct, ovate to lanceolate (herbaceous portion ovate to lanceolate), 3–6 mm, apex acute to acuminate;
petals 1.1–1.6 times as long as sepals.
on stipe ca. 0.1–0.2 mm, ovoid, 5 mm, usually shorter than sepals.
reddish brown to dark brown, oblong-elliptic with hilar notch on 1 end, 1.5–2.7 mm, tuberculate;
tubercles low-rounded.
Minuartia nuttallii
Minuartia nuttallii var. gregaria
Varieties 4 (4 in the flora).
Minuartia nuttallii, M. decumbens, M. rosei, and M. stolonifera form a complex that, together with the eastern species M. caroliniana and M. michauxii, comprise sect. Sclerophylla Mattfeld. The four western species all have capsules that contain one to three(?) large (1.5–2.8 mm) seeds; unfortunately, these plants appear to be collected only rarely in fruit.
Minuartia nuttallii includes four varieties, which can, for the most part, be easily recognized. There is some overlap between var. gracilis and var. fragilis in western Nevada and southeastern Oregon, where some plants exhibit prominently arcuate-spreading leaves (as in var. fragilis) and weakly veined sepals (as in var. gracilis).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety gregaria is the variety likely the most closely related to M. decumbens, M. rosei, and M. stolonifera; it is the only one found in northwestern California and adjacent southwestern Oregon.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaf blade apices spinecent; sepal apices spinescent | → 2 |
1. Leaf blade apices acute to acuminate, somewhat navicular; sepal apices acuminate | → 3 |
2. Leaves prominently arcuate-spreading, blade 10-20 mm; sepals (1-)3-veined | var. fragilis |
2. Leaves appressed to occasionally arcuate- spreading, blade 5-7 mm; sepals 1(-3)-veined | var. gracilis |
3. Sepals lanceolate to narrowly so; petals 0.5-1.2 times as long as sepals | var. nuttallii |
3. Sepals ovate to lanceolate; petals 1.1-1.6 times as long as sepals | var. gregaria |
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