Minuartia marcescens

(Fernald) House

Amer. Midl. Naturalist 7: 132. 1921.

Common names: Serpentine stitchwort or sandwort minuartie de la serpentine
EndemicConservation concern
Basionym: Arenaria marcescens Fernald Rhodora 21: 15. 1919
Synonyms: Arenaria laricifolia var. marcescens (Fernald) B. Boivin
Treatment appears in FNA Volume 5. Treatment on page 128. Mentioned on page 116, 118.

Plants perennial, mat-forming or more commonly straggly. Taproots stout, woody. Stems ascending, green, 4–6 cm, glabrous proximally, stipitate-glandular distally, internodes of flowering-stems 6–8 times as long as leaves. Leaves tightly overlapping (vegetative), variably spaced (cauline), usually connate proximally, with tight, scarious to herbaceous sheath 0.5–1.5 mm; blade straight to outwardly curved, green, 3-angled, prominently 1-veined abaxially, subulate, 4–8 × 0.3–0.8 mm, flexuous, margins not thickened, herbaceous, smooth, apex green, rounded to truncate, sometimes apiculate, shiny, glabrous; axillary leaves present among vegetative leaves. Inflorescences solitary flowers, terminal; bracts lance-subulate, herbaceous. Pedicels 0.5–1.5 cm, usually densely stipitate-glandular. Flowers: hypanthium cupshaped; sepals 3-veined, ovate to broadly lanceolate (herbaceous portion oblong to narrowly ovate), 3–4 mm, not enlarging in fruit proximally, apex often purple, rounded, hooded or not, stipitate-glandular; petals white or rarely lilac, spatulate to spatulate-obovate, 1.5–2 times as long as sepals, apex rounded, entire. Capsules narrowly ellipsoid, 6–10 mm, longer than sepals. Seeds brown, suborbiculate with radicle prolonged into beak, somewhat compressed, 0.9–1.2 mm, smooth.


Phenology: Flowering summer.
Habitat: Ultramafic ledges and barrens
Elevation: 200-1000 m

Distribution

V5 261-distribution-map.gif

Nfld. and Labr. (Nfld.), Que., Vt.

Discussion

Of conservation concern.

Marcescent leaves are a characteristic feature of this species.

Selected References

None.

Lower Taxa

None.

"-8timesaslongasleaves" is not declared as a valid unit of measurement for this property."-2timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Minuartia marcescens"
not +  and hooded +
entire +  and apiculate +
stipitate-glandular +  and glabrous +
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(Fernald) House +
Arenaria marcescens +
flexuous +, straight +  and outwardly curved +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
subulate +  and 3-angled +
? (?) +  and ? (?) +
0.3mm;0.8mm +
lance-subulate +
reduced +
scarious +  and herbaceous +
ellipsoid +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Serpentine stitchwort or sandwort +  and minuartie de la serpentine +
axillary +  and terminal +
dish--shaped +
expanded +
Nfld. and Labr. (Nfld.) +, Que. +  and Vt. +
200-1000 m +
straight +  and curved +
central +  and peripheral +
axillary +  and terminal +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Ultramafic ledges and barrens +
disc--shaped +  and dish +
sessile +  and petiolate +
spaced +  and overlapping +
connate +
not thickened +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
reflexed;erect;arcuate-spreading +
stipitate-glandular +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
fugacious +
Flowering summer. +
Amer. Midl. Naturalist +
prolonged +
muriculate-papillate +  and tuberculate +
compressed +  and suborbiculate +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
distinct +
ovate;broadly lanceolate +
not enlarging +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
scarious +  and herbaceous +
Endemic +  and Conservation concern +
branched +  and simple +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
[30 +  and 3 +
papillate +
distinct +
filiform +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Arenaria laricifolia var. marcescens +
Minuartia marcescens +
Minuartia +
species +
divided +
10 +  and 8 +
erect +  and recurved +
rhizomatous +  and taprooted +
plant +, straggly +  and mat-forming +
pubescence of simple hairs or stalked glands +  and glabrous +
23 +, 15 +, 14 +, 13 +, 12 +, 10 +, 9 +  and 7 +