Metastelma palmeri

S. Watson

Proc. Amer. Acad. Arts 18: 115. 1883.

Synonyms: Cynanchum maccartii Shinners
Treatment appears in FNA Volume 14.
Revision as of 21:33, 6 October 2024 by imported>Volume Importer
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Stems woody, not corky at base, glabrous. Leaves: 1 stipular col­leter on each side of petiole, sometimes with 1 additional interpetiolar colleter; petiole 2–5 mm, sparsely puberulent; blade linear-lanceolate, ellip­tic, or lanceolate, 10–30 × 2–8 mm, chartaceous, faintly pinnately veined, base rounded to cuneate, with 2 laminar colleters, margins planar, apex acute to rounded, mucronulate, surfaces glabrous abaxially, pilosulous on midvein adaxially, margins sometimes sparsely pilosulous. Inflorescences shortly racemiform, 3–8-flowered; peduncle 0–2 mm, puberulent. Pedicels 1–2 mm, glabrous. Flowers: calyx lobes lanceolate to ovate, apices obtuse to acute, 1–1.5 mm, margins scarious, with 1 colleter per sinus; corolla cream to yellowish cream, campanulate, tube 0.5 mm, lobes erect with spreading tips, opening not obscured, linear, 1.5–2 mm, abaxially glabrous, adaxially densely, short-puberulent marginally and apically with opaque, matted, flattened hairs, densely hispid centrally with downward-pointing acicular, translucent hairs; corona segments united to base of anthers, laminar, lanceolate, 1 mm, slightly longer than gynostegium; gynostegium sessile; style apex convex. Follicles dark brown, 4–7 × 0.4–0.7 cm, apically acuminate, glabrous. Seeds 8–12, brown, flat, 4–6 × 2–3 mm, winged, with minute papillae forming ridges, chalazal margin erose; coma white, 2–3 cm.


Phenology: Flowering Apr–Oct; fruiting Jun–Oct.
Habitat: Valleys, plains, canyons, limestone, rocky, caliche, clay, or sandy soils, thorn scrub, oak-juniper woodland.
Elevation: 100–600 m.

Distribution

Tex., Mexico (Coahuila, Nuevo León, Tamaulipas).

Discussion

Metastelma palmeri overlaps in range with M. barbigerum in southern Texas. It is commonly encoun­tered in the blackbrush thorn scrub of the Rio Grande valley and southwestern margin of the Edwards Plateau.

Selected References

None.

Lower Taxa

None.
... more about "Metastelma palmeri"
Mark Fishbein +
S. Watson +
Tex. +, Mexico (Coahuila +, Nuevo León +  and Tamaulipas). +
100–600 m. +
Valleys, plains, canyons, limestone, rocky, caliche, clay, or sandy soils, thorn scrub, oak-juniper woodland. +
Flowering Apr–Oct +  and fruiting Jun–Oct. +
Proc. Amer. Acad. Arts +
Cynanchum maccartii +
Metastelma palmeri +
Metastelma +
species +