Minuartia rosei

(Maguire & Barneby) McNeill

Rhodora 82: 499. 1980.

Common names: Peanut stitchwort
Endemic
Basionym: Arenaria rosei Maguire & Barneby Leafl. W. Bot. 8: 56. 1956
Treatment appears in FNA Volume 5. Treatment on page 133. Mentioned on page 119, 124, 129, 130, 134.

Plants perennial, mat-forming. Taproots moderately stout, woody. Stems ascending to erect, green, 5–20 cm, glabrous except in inflorescence, glaucous, internodes of stems 0.5–4 times as long as leaves (proximal leaves longer than internodes); rhizomes and trailing stems 5–20 cm. Leaves loosely overlapping proximally, ± evenly spaced, connate proximally, with tight, scarious sheath 0.2–0.6 mm; blade straight or outwardly curved, green, shallowly concave (dorsiventrally flattened, curved into trough), 1-veined abaxially, needlelike, 4–15 × 0.5–1.2 mm, ± flexuous, margins not thickened, scarious in proximal 1/5, smooth, apex green to purple, acute to obtuse, sometimes apiculate, navicular, dull, glabrous, glaucous; axillary leaves well developed among proximal cauline leaves. Inflorescences 12–25-flowered, open cymes; bracts subulate, herbaceous, margins scarious proximally. Pedicels 0.4–3 cm, often stipitate-glandular. Flowers: hypanthium disc-shaped; sepals obscurely 1-veined, narrowly ovate to lanceolate (herbaceous portion narrowly ovate to lanceolate), 2.5–4 mm, not enlarging in fruit, apex green to purple, acute to acuminate, not hooded, glabrous or very sparsely stipitate-glandular; petals oblanceolate to narrowly oblongelliptic, 1.4–2.2 times as long as sepals, apex rounded, entire. Capsules sessile, ovoid, 3.5–4.3 mm, longer than sepals. Seeds reddish-brown to brown, oblongelliptic, compressed, 2.3–2.8 mm, tuberculate; tubercles low, rounded.


Phenology: Flowering spring–summer.
Habitat: Open, serpentine slopes with scattered oak and Jeffrey pine
Elevation: 700-1400 m

Discussion

Minuartia rosei, like M. decumbens and M. stolonifera, is restricted to serpentine soils of northwestern California. The three species are most closely related to the polymorphic M. nuttallii.

Selected References

None.

Lower Taxa

None.

"-4timesaslongasleaves" is not declared as a valid unit of measurement for this property."-2.2timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Minuartia rosei"
entire +  and apiculate +
green +  and purple +
stipitate-glandular +, glabrous +  and glaucous +
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(Maguire & Barneby) McNeill +
Arenaria rosei +
flexuous +, curved +  and straight +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
concave +
? (?) +  and ? (?) +
0.5mm;1.2mm +
subulate +
reduced +
scarious +  and herbaceous +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
Peanut stitchwort +
axillary +  and terminal +
dish--shaped +
expanded +
700-1400 m +
straight +  and curved +
central +  and peripheral +
axillary +  and terminal +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Open, serpentine slopes with scattered oak and Jeffrey pine +
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 +
0.4 cm4 mm <br />0.004 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Lilac (?) +, Pink (?) +  and White (?) +
fugacious +
Flowering spring–summer. +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
tuberculate +
compressed +  and oblongelliptic +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
distinct +
narrowly ovate;lanceolate +
not enlarging +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
branched +  and simple +
trailing;ascending;erect +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 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 />) +
Alsinanthe +, Alsinopsis +, Lidia +, Minuopsis +, Porsildia +, Sabulina +, Tryphane +  and Wierzbickia +
Minuartia rosei +
Minuartia +
species +
divided +
10 +  and 8 +
erect +  and recurved +
rhizomatous +  and taprooted +
plant +  and mat-forming +
pubescence of simple hairs or stalked glands +  and glabrous +
23 +, 15 +, 14 +, 13 +, 12 +, 10 +, 9 +  and 7 +