Arenaria ludens

Shinners

Sida 1: 51. 1962.

Common names: Trans-Pecos sandwort
Treatment appears in FNA Volume 5. Treatment on page 54. Mentioned on page 51.

Plants annual. Taproots filiform. Stems 1–18+, erect to ascending, green or reddish, 15–30 (–45) cm; internodes ± terete, 1–10 times as long as leaves, dull, retrorsely pubescent in 2 lines. Leaves usually connate basally, with narrow, scarious sheath 0.2–0.5 mm, petiolate (proximal leaves) or sessile; petiole 2–4 mm; blade 1-veined, vein prominent abaxially, usually narrowly lanceolate, elliptic, or oblanceolate, 10–17 × 2–4 mm, herbaceous, margins ± flat, herbaceous, dull, ciliate in proximal 1/2, apex acute to acuminate, not pustulate, glabrous; axillary leaf clusters absent. Inflorescences terminal, open, minutely bracteate, 3–45+-flowered cymes. Pedicels erect or ascending in fruit, 3–20 mm, retrorsely pubescent in 2 lines. Flowers: sepals green or often purple, 1-veined, strongly keeled proximally, ovatelanceolate to narrowly lanceolate (herbaceous portion pale, narrowly lanceolate to linear), 3–4 mm, not enlarging in fruit, apex acuminate, not pustulate, glabrous; petals oblong to broadly elliptic, 2.8–4 mm, 1–11/3 times as long as sepals, apex rounded. Capsules loosely enclosed by calyx, ovoid, 3–3.5 mm, 4/5–1 times as long as sepals. Seeds 7–15, dark-brown to black, suborbicular, slightly compressed, 0.6–0.7 mm, shiny, obscurely tuberculate (20×).


Phenology: Flowering late summer–early autumn.
Habitat: Igneous soil on cliffs and ledges
Elevation: 1000-2000 m

Discussion

Arenaria ludens may be more closely related to A. lanuginosa than to A. benthamii, the taxon with which it is often confused, if seed morphology is any indication.

Selected References

None.

Lower Taxa

None.

"/5-1timesaslongassepals" is not declared as a valid unit of measurement for this property."-10timesaslongasleaves" is not declared as a valid unit of measurement for this property."-11/3timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Arenaria ludens"
not pustulate +
Ronald L. Hartman +, Richard K. Rabeler +  and Frederick H. Utech +
Shinners +
Laciniate (?) +, Emarginate (?) +, Jagged (?) +, 2-fid (?) +  and Entire (?) +
linear-lanceolate +  and usually elliptic +
smaller +
herbaceous +  and scarious +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Trans-Pecos sandwort +
3-45+-flowered +
dish--shaped +
expanded +
Tex. +  and n Mexico (Coahuila) +
1000-2000 m +
straight +  and curved +
central +  and peripheral +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Igneous soil on cliffs and ledges +
disc--shaped +  and dish +
bracteate +  and open +
sessile +  and petiolate +
connate +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
ascending;erect +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
fugacious +
0.28 cm2.8 mm <br />0.0028 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering late summer–early autumn. +
tuberculate +
compressed +  and suborbicular +
persistent +
connate +  and distinct +
ovatelanceolate;narrowly lanceolate +
not enlarging +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
grooved +, branched +  and simple +
reddish +  and green +
erect;ascending +
terete;ellipsoid +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 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 ludens +
Arenaria +
species +
ascending;recurved +
divided +
10 +  and 8 +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
2mm;4mm +
rhizomatous +  and taprooted +
pubescence of simple hairs or stalked glands +  and glabrous +
11 +, 10 +, 8 +  and [7 +