Minuartia drummondii
Minuartia michauxii
Drummond's stitchwort
Michaux's sandplant, Michaux's stitchwort, rock sandwort
filiform.
thickened, woody;
crown many-branched, thickened.
erect to ascending, green, 5–20 cm, stipitate-glandular, often densely so, internodes of all stems 1–3 times as long as leaves.
erect to ascending, green, 8–40 cm, glabrous, internodes of flowering stems 0.5–10+ times as long as leaves.
overlapping proximally, perfoliate proximally, with ± loose, scarious to herbaceous sheath 0.5–1 mm;
blade green, flat, 1-veined, oblanceolate to cuneate (proximal) to oblong-lanceolate to ovate (remaining cauline), 5–30(–35) × 2–4 mm, flexuous, margins not thickened, ± scarious, smooth, apex green to purple, obtuse to abruptly pointed, dull, glabrous;
axillary leaves absent.
tightly overlapping in proximal 1/3 of stem, variable spaced, usually connate proximally, with loose, scarious sheath 0.2–1 mm;
blade erect to spreading, green, flat or convex to 3-angled, 1–3-veined, prominently so abaxially, filiform, linear to linear-lanceolate, 8–30 × 0.5–1.8 mm, rigid, margins not thickened, ± scarious, smooth, apex green, blunt to pungent, flat to navicular, shiny, glabrous;
axillary leaves present among vegetative leaves.
7–12-flowered, open cymes, or rarely solitary, terminal;
bracts ± lanceolate, herbaceous, sometimes scarious-margined proximally.
5–30-flowered, lax to congested cymes;
bracts narrowly lanceolate to subulate, herbaceous, margins scarious.
reflexed in fruit, 0.5–2.5 cm, stipitate-glandular.
0.3–6 cm, glabrous.
hypanthium disc-shaped;
sepals obscurely veined, ovate to broadly elliptic (herbaceous portion ovate to broadly elliptic), 3–6 mm, to 7 mm in fruit, apex green or purple, acute to acuminate, not hooded, stipitate-glandular;
petals obovate to oblanceolate, 2–2.5 times as long as sepals, apex rounded, broadly notched.
hypanthium dish-shaped;
sepals 3-veined, ovate to lanceolate (herbaceous portion ovate to narrowly lanceolate), 3–6 mm, not enlarging in fruit, apex green, acute to mostly acuminate, not hooded, glabrous;
petals oblong-obovate, 1.3–2 times as long as sepals, apex rounded, entire.
sessile, broadly ellipsoid, 6–7.5 mm, equaling or longer than sepals.
on stipe ca. 0.1–0.2 mm, ellipsoid, 3–4 mm, usually shorter than sepals.
dark brown to blackish, orbiculate with radicle prolonged into beak, only slightly compressed, 0.7–0.8 mm, echinate with rounded tubercles.
black, suborbiculate, compressed, 0.8–0.9 mm, tuberculate;
tubercles elongate.
= 30(?), 44.
Minuartia drummondii
Minuartia michauxii
Minuartia drummondii is easily recognized by the proportionally large corollas (petals to three times as long as sepals) and pedicels reflexing in fruit.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
We concur with J. A. Steyermark (1963) and G. Yatskievych and J. Turner (1990) that the concept of Arenaria texana originally put forth by Britton requires further study. Plants labeled as Minuartia michauxii var. texana have slightly shorter leaves that are crowded into the proximal one-third rather than one-half of the somewhat shorter stem. The plants are often in the southern part of the range and may, as Steyermark noted, be associated with more open, xeric habitats.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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