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 orange-brown 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 red-brown, 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.

... more about "Cerastium texanum"
John K. Morton +
Britton +
Chihuahuan mouse-ear chickweed +
Ariz. +, N.Mex. +  and Mexico. +
1200-2800 m +
Canyons, sandy washes, oak woodlands, mountain pine forests +
Flowering spring. +
Bull. Torrey Bot. Club +
turner1995a +
Illustrated +
Cerastium longepedunculatum var. sordidum +, Cerastium sordidum +  and Stellaria montana +
Cerastium texanum +
Cerastium +
species +