Minuartia pusilla

(S. Watson) Mattfeld

Bot. Jahrb. Syst. 57(Beibl. 126): 28. 1921.

Common names: Annual sandwort dwarf stitchwort
Endemic
Basionym: Arenaria pusilla S. Watson Proc. Amer. Acad. Arts 17: 367. 1882
Synonyms: Alsinopsis pusilla (S. Watson) Rydberg
Treatment appears in FNA Volume 5. Treatment on page 132. Mentioned on page 116, 118, 123.

Plants annual. Taproots threadlike. Stems spreading to erect, green, 1–5 cm, glabrous, internodes of all stems 2–10 times as long as leaves. Leaves not overlapping, irregularly spaced, connate proximally, with loose, mostly herbaceous sheath 0.2–0.3 mm; blade ascending to widely spreading, green, concave proximally, flat distally, obscurely 1-veined, awl-shaped to lanceolate, 1.5–5 × 0.2–1.5 mm, flexuous, margins not thickened, scarious throughout or proximally, smooth, apex green or purple, acute to obtuse, flat to navicular, often shiny, glabrous; axillary leaves absent. Inflorescences 2–9-flowered, open cymes; bracts subulate, herbaceous, margins scarious proximally. Pedicels 0.1–0.5 cm, glabrous. Flowers: hypanthium disc-shaped; sepals 1-veined, or weakly 3-veined in proximal 1/5, ovate to lanceolate (herbaceous portion lanceolate to narrowly so), 1.5–3.5 mm, not enlarging in fruit, apex green or purple, acute to acuminate, not hooded, glabrous; petals narrowly lanceolate, 0.5–1 times as long as sepals, apex narrowly acute, entire, or absent. Capsules on stipe ca. 0.1 mm, ± ovoid, ca. 3 mm, equaling or longer than sepals. Seeds brown or reddish, asymmetically reniform with radicle prolonged into beak, not compressed, 0.5–0.6 mm, minutely papillate.


Phenology: Flowering spring–summer.
Habitat: Plains, pine barrens, dry rock cliffs
Elevation: 50-2400 m

Distribution

V5 271-distribution-map.gif

B.C., Calif., Idaho, Nev., Oreg., Utah, Wash.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Minuartia pusilla"
purple +  and green +
acute;acute;acuminate +
Richard K. Rabeler +, Ronald L. Hartman +  and Frederick H. Utech +
(S. Watson) Mattfeld +
Arenaria pusilla +
flexuous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
awl-shaped +  and lanceolate +
herbaceous +  and succulent +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
subulate +
reduced +
scarious +  and herbaceous +
3 cm30 mm <br />0.03 m <br /> (?) +
Annual sandwort +  and dwarf stitchwort +
axillary +  and terminal +
dish--shaped +
expanded +
B.C. +, Calif. +, Idaho +, Nev. +, Oreg. +, Utah +  and Wash. +
50-2400 m +
straight +  and curved +
central +  and peripheral +
axillary +  and terminal +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Plains, pine barrens, dry rock cliffs +
disc--shaped +  and dish +
disc--shaped +
2-10 times as long as leaves +
sessile +  and petiolate +
spaced +  and not overlapping +
connate +
not thickened +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
reflexed;erect;arcuate-spreading +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
lilac +, pink +  and white +
fugacious +
0.5-1 times as long as sepals +
lanceolate +
Flowering spring–summer. +
Bot. Jahrb. Syst. +
prolonged +
reddish;brown +
papillate +
not compressed +  and reniform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
3-veined +  and 1-veined +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
persistent +
distinct +
ovate;lanceolate +
not enlarging +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
branched +  and simple +
spreading;erect +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
[30 +  and 3 +
papillate +
0.1 cm1 mm <br />0.001 m <br /> (?) +
distinct +
filiform +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Alsinopsis pusilla +
thread-like +
Minuartia pusilla +
Minuartia +
species +
divided +
10 +  and 8 +
erect +  and recurved +
rhizomatous +  and taprooted +
pubescence of simple hairs or stalked glands +  and glabrous +
23 +, 15 +, 14 +, 13 +, 12 +, 10 +, 9 +  and 7 +