Arenaria livermorensis

Correll

Brittonia 18: 308. 1967.

Common names: Livermore sandwort
EndemicConservation concern
Treatment appears in FNA Volume 5. Treatment on page 54. Mentioned on page 51, 52.

Plants perennial, matted, moss-like. Taproots filiform. Stems 15–25, decumbent, trailing, green, 1–4 cm; internodes angular to grooved, 1–11/2 times as long as leaves, minute, shiny, pubescence of widely spreading to slightly retrorse hairs in 2 lines. Leaves connate basally, with herbaceous sheath 0.1–0.2 mm, sessile; blade 1-veined, vein prominent abaxially, linear, 4–6 × 1 mm, herbaceous, rigid, margins thickened, herbaceous, shiny, lined with peglike cilia, apex acute, pungent-tipped, not pustulate, glabrous; axillary leaf clusters present. Inflorescences solitary flowers in distal leaf-axils. Pedicels erect or ascending in fruit, 6–10 mm, minutely pubescent. Flowers: sepals green, 1-veined, slightly keeled proximally, broadly lanceolate (herbaceous portion narrowly lanceolate), 3–4 mm, not enlarging in fruit, apex acute to acuminate, not pustulate, glabrous; petals absent; stamens ca. 8. Capsules very loosely enclosed by calyx, ovoid, 2–3 mm, 2/3–4/5 times as long as sepals. Seeds 5–7, dark-brown to black, subglobose, slightly compressed, ca. 1 mm, shiny, smooth.


Phenology: Flowering spring–summer.
Habitat: Crevices of cliffs and bare walls
Elevation: 2100-2500 m

Discussion

Of conservation concern.

Arenaria livermorensis is known only from the Davis Mountains in the Trans-Pecos region of western Texas. It may be related to A. lycopodioides Willdenow ex Schlechtendal, a species found in the mountains of central Mexico.

Selected References

None.

Lower Taxa

None.

"/3-4/5timesaslongassepals" is not declared as a valid unit of measurement for this property."-11/2timesaslongasleaves" is not declared as a valid unit of measurement for this property.

... more about "Arenaria livermorensis"
pungent-tipped +
not pustulate +
Ronald L. Hartman +, Richard K. Rabeler +  and Frederick H. Utech +
Correll +
Laciniate (?) +, Emarginate (?) +, Jagged (?) +, 2-fid (?) +  and Entire (?) +
linear-lanceolate +  and usually elliptic +
smaller +
herbaceous +  and scarious +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Livermore sandwort +
dish--shaped +
expanded +
2100-2500 m +
straight +  and curved +
central +  and peripheral +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Crevices of cliffs and bare walls +
retrorse +  and spreading +
disc--shaped +  and dish +
connate +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
ascending;erect +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
fugacious +
Flowering spring–summer. +
tuberculate +, rugulose +  and smooth +
compressed +  and subglobose +
persistent +
connate +  and distinct +
lanceolate;keeled +
not enlarging +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Endemic +  and Conservation concern +
grooved +, branched +  and simple +
terete;ellipsoid +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
[30 +  and 3 +
papillate +
distinct +
filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Spergulastrum +
Arenaria livermorensis +
Arenaria +
species +
ascending;recurved +
divided +
10 +  and 8 +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
rhizomatous +  and taprooted +
plant +, moss-like +  and matted +
pubescence of simple hairs or stalked glands +  and glabrous +
11 +, 10 +, 8 +  and [7 +