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false serviceberry

Big Bend serviceberry, southern false serviceberry

Habit Shrubs, 10–30[–50] dm.
Stems

1–20, ascending, much branched, often ± twisted, young stems terete, closely villous, smooth;

bark brown or gray, young stems not hairy; long shoots present, short shoots sometimes present; unarmed;

grayish- or whitish-tomentose, sometimes glabrate; overwintering buds tomentose.

Leaves

drought-deciduous or persistent, cauline, simple, slightly conduplicate;

stipules tardily deciduous or ± persistent, free, lanceolate, glandlike, margins entire;

petiole present;

blade elliptic or oblong-ovate to orbiculate, 0.5–1.5[–3.1] cm, leathery, margins flat, denticulate or entire, teeth gland-tipped, venation pinnate, abaxial surface tomentose, adaxial ± glabrous.

stipules 1 mm;

petiole 2–4(–10) mm;

blade 0.5–1.5 × 0.3–1 mm, base cuneate to rounded or truncate, margins: teeth 4–8 per side, apex truncate to rounded or acute to mucronate.

Bracts

persistent, lanceolate, ciliate.

Inflorescences

terminal on leafy shoots of season, 1–5[–7]-flowered, corymbs [panicles], axes glabrous or hairy;

bracts absent;

bracteoles sometimes present.

Pedicels

present.

2–7(–9) mm.

Flowers

perianth and androecium epigynous, 10 mm diam.;

hypanthium campanulate [urceolate], (2–)3–4 mm, distally copiously white-tomentose;

sepals 5, spreading, nearly orbiculate (inner broadly deltate);

petals 5, white, round or kidney-shaped, base short-clawed;

stamens [8–]14–20[–22], longer or shorter than petals;

carpels 2 or 3[–5], barely connate or distinct, adnate to proximal 1/2–4/5 of hypanthium, ovary appearing 4–10-loculed by false partitions, densely hairy, styles 2 or 3, ventral, distinct;

ovules 2 (separated by false partition).

sepals 1.6 × 2.8 mm, ciliate;

petals 2.5–5.5 mm.

Fruits

berrylike pomes, translucent, vivid pink, drying purplish black, globose, 6–10 mm, glabrous;

flesh whitish;

hypanthium persistent;

sepals persistent, erect or recurving;

carpels cartilaginous;

styles persistent.

Pomes

edible, insipid.

Seeds

4–6(–10).

Malacomeles

Malacomeles denticulata

Phenology Flowering spring; fruiting summer.
Habitat Talus slopes, canyons, on limestone and igneous substrates
Elevation (500–)800–1700 m ((1600–)2600–5600 ft)
Distribution
from USDA
United States; Mexico; Central America
[BONAP county map]
from FNA
TX; Mexico; Central America (Guatemala)
[BONAP county map]
Discussion

Species 2 (1 in the flora).

Malacomeles shares with Amelanchier and Peraphyllum the feature of false partitions within the carpels; the partitions partially divide the locules and make the fruit appear to have twice as many locules as the number of carpels (G. N. Jones 1945; K. R. Robertson et al. 1991; J. R. Rohrer et al. 1991). Sequences from multiple chloroplast and nuclear genes indicate that Malacomeles is closely related to Amelanchier and Peraphyllum (C. S. Campbell et al. 2007).

The other species in the genus, Malacomeles nervosa (Decaisne) G. N. Jones, is known from Nuevo León, Mexico south to Guatemala.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Malacomeles denticulata is a xerophytic shrub with small leaves and flowers. The species is found in the flora area only in trans-Pecos Texas.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 9, p. 645. Author: Christopher S. Campbell. FNA vol. 9, p. 646.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Maleae Rosaceae > subfam. Amygdaloideae > tribe Maleae > Malacomeles
Subordinate taxa
M. denticulata
Synonyms Cotoneaster section M. Cotoneaster denticulatus, 6(qto.), plate, Amelanchier denticulata
Name authority (Decaisne) Decaisne: Ann. Gén. Hort. 23: 156. (1882) (Kunth) Decaisne: Fl. Serres Jard. Paris 23: 156. (1882)
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