Cerastium texanum

Britton

Bull. Torrey Bot. Club 15: 97. 1888.

Common names: Chihuahuan mouse-ear chickweed
Illustrated
Synonyms: Cerastium longepedunculatum var. sordidum (B. L. Robinson) Briquet Cerastium sordidum B. L. Robinson Stellaria montana Rose
Treatment appears in FNA Volume 5. Treatment on page 90. Mentioned on page 74, 75.

Plants annual, with slender taproot and branched caudex. Stems erect, sparingly branched proximally, slender, 15–35 cm, sparsely glandular-pilose; small axillary tufts of leaves absent. Leaves not marcescent; proximal blades broadly spatulate-petiolate, 8–55 × 3–16 mm, apex acute or obtuse, sometimes short-acuminate, softly pilose; cauline few, sessile, blade linear-lanceolate to narrowly oblanceolate, 7–30 mm, apex acute, pilose. Inflorescences very open and loose, 2–9 (–25) -flowered cymes; bracts narrowly lanceolate, pilose. Pedicels straight, becoming sharply deflexed at base, slender, 5–20 mm, elongating in fruit, 1.5–4 times as long as sepals, glandular-pilose. Flowers: sepals green, turning pale orangebrown in fruit, lanceolate to ovate, 3–6 mm, margins narrow, apex acute, with short, glandular pubescence; petals oblanceolate, 5–8 mm, 1.5–2 times as long as sepals, apex 2-fid; stamens 5; styles 5. Capsules cylindric, straight, 5–12 mm, 1.5–2 times as long as sepals; teeth 10, becoming outwardly coiled. Seeds redbrown, 0.4–0.7 mm diam., tuberculate; tubercles ± pointed; testa not inflated. 2n = 36.


Phenology: Flowering spring.
Habitat: Canyons, sandy washes, oak woodlands, mountain pine forests
Elevation: 1200-2800 m

Discussion

Cerastium texanum is exceptionally variable in flower and capsule size. The extent to which this variation is due to environmental conditions or is genic in origin is not known. The broad, spatulate basal leaves and the straight, cylindric capsule with its outwardly coiled (revolute) teeth distinguish this species.

Lower Taxa

None.

"-2timesaslongassepals" 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 "Cerastium texanum"
perigynous +  and hypogynous +
John K. Morton +
Britton +
elliptic to broadly ovate +  and linear +
linear-lanceolate +  and narrowly oblanceolate +
0.7 cm7 mm <br />0.007 m <br /> (3 cm30 mm <br />0.03 m <br />) +
often +  and herbaceous +
lanceolate +
reduced +
herbaceous +  and scarious +
8 +  and 6 +
cylindric +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Chihuahuan mouse-ear chickweed +
2-9(-25)-flowered +
dish--shaped +
expanded +
Ariz. +, N.Mex. +  and Mexico +
1200-2800 m +
straight +  and curved +
central +  and peripheral +
pistillate +  and subsessile +
inconspicuous +
unisexual +  and bisexual +
pale orangebrown +
1.5-4 times as long as sepals +
stalked +  and simple +
Canyons, sandy washes, oak woodlands, mountain pine forests +
disc--shaped +  and dish +
sessile +  and petiolate +
not marcescent +
connate +
translucent +  and purplish +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
elongating +
glandular-pilose +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
perigynous +  and hypogynous +
fugacious +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
Flowering spring. +
spatulate-petiolate +
0.8 cm8 mm <br />0.008 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Bull. Torrey Bot. Club +
turner1995a +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
tuberculate +
compressed +  and angular-obovate +
persistent +
distinct +
lanceolate;ovate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
Illustrated +
slender +
15 cm150 mm <br />0.15 m <br /> (35 cm350 mm <br />0.35 m <br />) +
subterminal +
[30 +  and 5 +
roughened +  and papillate +
distinct +
clavate +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Cerastium longepedunculatum var. sordidum +, Cerastium sordidum +  and Stellaria montana +
rooting +  and rhizomatous +
Cerastium texanum +
Cerastium +
species +
not inflated +
divided +
10 +  and 8 +
rhizomatous +  and taprooted +
pubescence of simple hairs or stalked glands +  and glabrous +
19 +, 18 +, 17 +, 15] +, 13 +  and [9 +