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| 1 |
Leaf blade not lobed, convolute in bud; pome without stone cells. |
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(2) |
| + |
Leaf blade usually lobed, rarely not lobed, folded in bud; pome without or with few stone-cells. |
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(16) |
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| 2 (1) |
Sepals caducous in fruit; styles 3–5; pome usually less than 1.5 cm in diam. |
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(3) |
| + |
Sepals persistent in fruit; styles (4 or)5; pome larger, usually more than 2 cm in diam. |
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(11) |
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| 3 (2) |
Sepals triangular-ovate, ca. as long as or slightly shorter than hypanthium. |
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(4) |
| + |
Sepals lanceolate, longer than hypanthium. |
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(6) |
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| 4 (3) |
Hypanthium, sepals, branchlets, petiole, and pedicel tomentose. |
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8 M. daochengensis |
| + |
Hypanthium and sepals abaxially glabrous; branchlets, petiole, and pedicel slightly pubescent when young, soon glabrescent. |
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(5) |
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| 5 (4) |
Leaf blade acutely serrulate; sepals apically acuminate or acute; styles 3, rarely 4; pome ellipsoid to subglobose. |
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6 M. hupehensis |
| + |
Leaf blade obtusely serrulate; sepals apically obtuse; styles 4 or 5; pome pyriform or obovoid. |
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7 M. halliana |
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| 6 (3) |
Branchlets glabrous or puberulous; leaf blade initially puberulous, glabrescent or subglabrous later. |
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(7) |
| + |
Branchlets and leaf blade abaxially often tomentose or pubescent. |
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(9) |
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| 7 (6) |
Petiole, leaf veins, pedicel, and hypanthium often sparsely pubescent; pome ellipsoid or obovoid. |
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3 M. manshurica |
| + |
Petiole, leaf veins, pedicel, and hypanthium glabrous; pome subglobose or obovoid. |
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(8) |
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| 8 (7) |
Sepals lanceolate, apex long acuminate; styles 5 or 4, basally densely villous, pome subglobose with an obscure small scar at apex. |
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1 M. baccata |
| + |
Sepals ovate, apex caudate, rarely acuminate; styles (3 or)4, basally slightly pilose or glabrous, pome obovoid, with a large scar at apex. |
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2 M. jinxianensis |
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| 9 (6) |
Styles basally glabrous, pome obovoid or pyriform, white punctate; leaf blade abaxially densely tomentose. |
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4 M. sikkimensis |
| + |
Styles basally pubescent or glabrous, pome subglobose, not punctate; leaf blade abaxially pubescent. |
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(10) |
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| 10 (9) |
Leaf margin adpressed serrate, blade abaxially densely puberulous, base rounded or broadly cuneate; petals white but pink abaxially; pome ovoid or subglobose, slightly convex at apex, sepals caducous. |
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5 M. rockii |
| + |
Leaf margin acutely serrate, blade abaxially pubescent when young, glabrescent, base cuneate; petals pink; pome subglobose, impressed at apex, sepals caducous or persistent. |
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14 M. ×micromalus |
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| 11 (2) |
Sepals apically acute, shorter than or ca. as long as hypanthium. |
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(12) |
| + |
Sepals apically acuminate, longer than hypanthium. |
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(13) |
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| 12 (11) |
Leaf base broadly cuneate or subrounded; petiole 1.5–2 cm, pome yellow, without cavity at base; sepals persistent. |
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13 M. spectabilis |
| + |
Leaf base cuneate; petiole 2–3.5 cm; pome red with cavity at base; sepals caducous or persistent. |
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14 M. ×micromalus |
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| 13 (11) |
Leaf margin obtusely serrate; pome depressed-globose or globose, often projected at apex. |
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(14) |
| + |
Leaf margin often acutely serrate; pome ovoid, attenuate at apex, not or slightly projected at apex. |
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(15) |
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| 14 (13) |
Cultivated species; pome large, with short pedicel; leaf blade serrate; branchlets, buds, and leaves with many hairs. |
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9 M. pumila |
| + |
Native species; pome small, with long pedicel, leaf blade serrulate; branchlets, buds, and leaves with few hairs. |
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10 M. sieversii |
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| 15 (13) |
Pome large, 4–5 cm in diam., with 1.5–2 cm pedicel; leaf blade abaxially densely puberulous. |
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11 M. asiatica |
| + |
Pome smaller, 2–2.5 cm in diam., with 3.2–3.5 cm pedicel; leaf blade abaxially puberulous or subglabrous only along veins. |
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12 M. prunifolia |
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| 16 (1) |
Sepals caducous. |
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(17) |
| + |
Sepals persistent. |
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(21) |
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| 17 (16) |
Styles basally villous; pome subglobose. |
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15 M. sieboldii |
| + |
Styles basally glabrous; pome ellipsoid or obovoid, rarely subglobose. |
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(18) |
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| 18 (17) |
Leaf blade often 3–5-lobed, doubly serrate at margin; pome with few stone cells. |
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(19) |
| + |
Leaf blade 3–5-parted, not doubly serrate at margin; pome without stone cells. |
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(20) |
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| 19 (18) |
Lobes of leaf blade triangular-ovate; leaf blade rounded or truncate at base; fruiting pedicel 2–3.5 cm. |
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16 M. kansuensis |
| + |
Lobes of leaf blade oblong-ovate; leaf blade cordate or subcordate at base; fruiting pedicel 1.2–1.5 cm. |
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17 M. komarovii |
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| 20 (18) |
Young branches puberulous, soon glabrescent; leaf blade undivided or sometimes parted, both surfaces pubescent; flower 2–2.5 cm in diam. |
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18 M. toringoides |
| + |
Young branches tomentose; leaf blade parted, tomentose on both surfaces; flowers 1.5–2 cm in diam. |
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19 M. transitoria |
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| 21 (16) |
Pome projected at apex, core separated. |
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(22) |
| + |
Pome with cupular cavity at apex, core not separated. |
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(23) |
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| 22 (21) |
Pedicel, hypanthium, and sepals abaxially tomentose. |
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24 M. doumeri |
| + |
Pedicel, hypanthium, and sepals abaxially glabrous. |
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25 M. leiocalyca |
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| 23 (21) |
Leaf margin not lobed; inflorescence subcorymbiform. |
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(24) |
| + |
Leaf margin 3–6-lobed, acutely doubly serrate; inflorescence subracemose. |
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(25) |
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| 24 (23) |
Leaf margin serrulate, abaxially glabrous or sparsely puberulous; pome 1–1.5 cm in diam.; fruiting pedicel glabrous. |
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20 M. prattii |
| + |
Leaf margin doubly serrate, abaxially tomentose; pome 1.5–2 cm in diam.; fruiting pedicel villous. |
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21 M. ombrophila |
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| 25 (23) |
Styles 3 or 4; leaf blade abaxially puberulous; hypanthium and pedicel sparsely pubescent. |
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22 M. honanensis |
| + |
Styles 5; leaf blade abaxially tomentose; hypanthium and pedicel tomentose. |
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23 M. yunnanensis |
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