Flora of North America species comparison

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Metastelma barbigerum
Stems

woody, not corky at base, glabrous.
Leaves

1 stipular colleter on each side of petiole;

petiole 1.5–4 mm, glabrous;

blade linear, oblong, or lanceolate, 10–45 × 1–18 mm, chartaceous, faintly pinnately veined, base rounded to subcordate, with 1–2 laminar colleters, margins revolute on drying, apex acute to attenuate, mucronulate, surfaces glabrous abaxially, pilosulous on midvein adaxially.
Inflorescences

umbelliform to shortly racemiform, 3–6-flowered;

peduncle 0–0.5 mm.
Pedicels

1–3 mm, glabrous.
Flowers

calyx lobes ovate, lanceolate, or oblong, apices obtuse to acute, 0.5–1 mm, glabrous, margins scarious, with 1 colleter per sinus;

corolla cream to yellowish cream, campanulate, tube 1 mm, lobes erect with spreading and recurved tips, opening not obscured, linear-lanceolate, 2.5–3.5 mm, abaxially glabrous, adaxially densely long-villous marginally and apically with erect, opaque, flattened hairs, densely hispid centrally with downward-pointing acicular translucent hairs;

corona segments united to base of column, laminar, acicular, 1–1.5 mm, ± as long as gynostegium;

gynostegial column 0.5–0.7 mm;

style apex convex.
Seeds

10–16, brown, flat to somewhat navicular, 5–6 × 2–3 mm, broadly winged, smooth;

coma white, 2–2.5 cm.
Follicles

dark brown, 4–6 × 0.4–0.7 cm, apically acuminate, glabrous.
2n

= 22.

Metastelma barbigerum
Phenology Flowering Mar–Nov; fruiting Apr–Dec.
Habitat Ridge tops, cliffs, stream banks, edges of marshes, coastal dunes, disturbed areas, limestone, granite, clay, silt or sand soils, thorn scrub, mesquite grasslands, oak woods.
Elevation 0–800 m. (0–2600 ft.)
Distribution
from FNA
TX; Mexico (Coahuila, Nuevo León, Tamaulipas)
Discussion

Metastelma barbigerum is a morphologically and ecologically variable species. It is the most commonly encountered species of Metastelma in Texas. Plants on the Edwards Plateau are commonly found in more mesic microsites and have much larger leaves than plants found near the coast or in the Rio Grande valley. This name is commonly misapplied to specimens of other species in the southwestern United States and northern Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 14.
Parent taxa Apocynaceae > Metastelma
Sibling taxa
M. arizonicum, M. bahamense, M. blodgettii, M. mexicanum, M. palmeri, M. pringlei
Synonyms Cynanchum barbigerum
Name authority Scheele: Linnaea 21: 760. (1849)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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