Flora of North America species comparison

1+ (derived from root shoots), erect;

bark dark brown, reddish brown, or gray, firm, platy or scaly; long and short shoots present;

thorns present (modified short shoots); glabrous, glabrescent, villous, densely puberulent, or tomentose.

6–45 cm diam.;

bark dark reddish brown to gray, with narrow reddish brown scales, sometimes glaucous when young;

young branches reddish gray, tomentose, becoming reddish brown or dark brown and glabrous or slightly puberulous; flowering shoots becoming spurs or spiny thorns, 10–60 mm.

reddish brown, ovoid, 3–4 mm, scale margins tomentose.

deciduous [semipersistent], cauline, simple, shoot dimorphism, long- and juvenile-shoot leaves usually larger and more deeply serrate (lobed) than short-shoot leaves;

stipules deciduous (or persistent on vigorous shoot leaves in M. baccata), basally adnate to petiole, linear-lanceolate to lanceolate, sometimes filiform, membranous, sometimes herbaceous, margins entire, serrulate, glandular-serrate, sparsely glandular-denticulate, or white-ciliate;

petiole present;

blade elliptic, ovate, obovate, triangular-ovate, oval, lanceolate, ovate-oblong, or oblong, (2–)4–12 cm, membranous or leathery, margins flat, sometimes lobed, dentate, serrulate, serrate, doubly serrate, crenate, or sometimes entire, venation pinnate (craspedodromous when lobed, camptodromous when unlobed), surfaces glabrous or tomentose.

conduplicate in bud;

heteromorphic;

stipules deciduous, narrowly lanceolate, 3–8 mm, apex acute; vigorous shoot leaves: petiole 15–30 mm, tomentose;

blade ovate, sometimes triangular-ovate or oval, 3–9(–12) × 1.5–4(–6) cm, base cuneate to rounded, margins usually lobed, serrate or crenate-serrate, sometimes doubly serrate, apex acute, broadly acute, or rounded, abaxial surface tomentose (villous only on veins), adaxial glabrous or slightly villous; flowering shoot leaves: petiole 5–20(–25) mm, tomentose, sometimes puberulent;

blade elliptic, oval, or ovate, 2–5 × 1–2 cm, base cuneate or rounded, sometimes truncate-rounded, margins lobed or unlobed, serrate, doubly serrate, or crenate-serrate, apex acute, broadly acute, or rounded, abaxial surface usually tomentose, adaxial glabrous.

corymblike;

peduncles absent;

bracteoles sometimes persistent, filiform, 3–10 mm.

terminal on short shoots, 2–12-flowered, flat-topped panicles, glabrous or tomentose;

bracts present (absent in M. fusca), caducous, ovate, linear-lanceolate, membranous, glabrous;

bracteoles present.

present.

15–30 mm, tomentose, sometimes puberulent or sparsely strigose.

bisexual (occasionally andromonoecious in M. halliana), opening with leaves, perianth and androecium epigynous, 15–50 mm diam.;

hypanthium campanulate, size not recorded, glabrous or tomentose;

sepals 5, reflexed to wide spreading, triangular, triangular-lanceolate, triangular-ovate, or lanceolate;

petals 5 (or more in M. halliana), white, pink, or red, suborbiculate, obovate, narrowly or oblong-obovate, ovate, or ± elliptic, base clawed;

stamens 15–50, unequal, usually shorter than, rarely equal to, petals;

carpels 3–5, connate, adnate to hypanthium, styles 3–5, emerge from base of hypanthium, basally connate, glabrous or tomentose basally;

ovules 2.

fragrant, 35–50 mm diam.;

hypanthium tomentose;

sepals triangular, 3–7 mm, equal to tube, apex acuminate, surfaces hoary-tomentose;

petals pink, sometimes fading white, oblong to narrowly obovate, (11–)14–20(–22) mm, claws (2–)3–4 mm, margins entire, sinuate, or fimbriate, apex rounded;

stamens 20, 8–16 mm, anthers rose before dehiscence;

styles 5, connate basally, 9–15 mm, ± equal to stamens, tomentose in proximal 1/3.

pomes, green, yellow, or red, globose, depressed-globose, obovoid, or oblong, 6–50(–70) mm diam., glaucous, waxy, punctate;

flesh homogeneous, stone cells adjacent to carpels and epidermis;

hypanthium persistent;

sepals persistent or deciduous, erect or reflexed;

carpels cartilaginous;

styles persistent or deciduous.

green, sometimes yellow, depressed-globose, sometimes globose, 20–30 mm diam., greasy, waxy, cores not enclosed at apex;

sepals persistent, erect;

sclereids abundant surrounding core.

2 per carpel, light, dark, or reddish brown, smooth.

dark brown.

= 17.

= 34, 51, 64.