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| 1 |
Terminal buds glabrous |
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(2) |
| + |
Terminal buds hairy |
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(18) |
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| 2 (1) |
Leaf blade abaxially densely glandular-punctate |
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(3) |
| + |
Leaf blade abaxially not glandular-punctate |
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(5) |
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| 3 (2) |
Leaf blade large, 12.5-40 × 7-21 cm, thickly papery, ovate to ovate-oblong. |
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23 B. fasciata |
| + |
Leaf blade smaller, 7-16 × 2.5-5.5 cm, papery or leathery, narrowly elliptic or lanceolate |
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(4) |
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| 4 (3) |
Leaf blade papery, narrowly elliptic, adaxially gray-brown and abaxially purple-black when dry, apex acuminate or long acuminate, always falcate-curved; terminal buds small; fruits oblong-ellipsoid, 3-4.3 cm. |
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24 B. pergamentacea |
| + |
Leaf blade leathery, lanceolate or narrowly elliptic, adaxially green-brown or gray-brown and abaxially dark brown or purple-black when dry, apex obtuse or shortly acuminate; terminal buds large; fruits obovoid or subturbinate, ca. 3 cm. |
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25 B. robusta |
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| 5 (2) |
Midrib adaxially plane or elevated |
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(6) |
| + |
Midrib adaxially impressed (at least near base) |
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(8) |
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| 6 (5) |
Leaf apex rounded. |
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26 B. longepetiolata |
| + |
Leaf apex not rounded |
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(7) |
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| 7 (6) |
Leaves alternate, leaf blade ovate or ovate-lanceolate, abaxially powdery green or powdery brown, veins densely reticulate, adaxially foveolate when dry. |
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27 B. glauca |
| + |
Leaves opposite or alternate, leaf blade narrowly elliptic or ovate-lanceolate, dark brown and shiny when dry, veins sparsely foveolate on both surfaces when dry. |
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28 B. erythrophloia |
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| 8 (5) |
Fruits small, ellipsoid or subglobose, less than 2 cm, always verruculose |
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(9) |
| + |
Fruits large, more than 2.5 cm, smooth or verruculose |
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(11) |
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| 9 (8) |
Leaf blade large, (6-)8-12 × (2.5-)3-4.5 cm; inflorescences axillary. |
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29 B. fordii |
| + |
Leaf blade small, 2.5-8 × 1-2.8(-3) cm; inflorescences terminal and/or axillary |
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(10) |
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| 10 (9) |
Leaf blade longer, 4-8 cm, leathery, adaxially dark brown when dry, lateral veins slightly conspicuous, veins inconspicuous, petiole 1-1.5 cm; fruits ellipsoid, ca. 1.1 cm in diam.. |
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30 B. brevipaniculata |
| + |
Leaf blade shorter, 2.5-4(-6) cm, thinly leathery, adaxially dark gray when dry, lateral veins and reticulate veins conspicuously elevated, abaxially dark brown, petiole 2-5 mm; fruits subglobose, ca. 1.5 cm in diam.. |
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31 B. brevifolia |
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| 11 (8) |
Fruits nearly obovoid-ellipsoid, ovoid, or globose to subglobose; leaf blade veins slender, always slightly conspicuous; petiole 7-15 mm |
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(12) |
| + |
Fruits ellipsoid or nearly olive-shaped; leaf blade veins mostly conspicuously elevated; petiole 10-30 mm |
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(13) |
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| 12 (11) |
Leaf blade oblong or oblong-elliptic, 7-14 × 3-6 cm, adaxially opaque, abaxially furfuraceous, apex acute or somewhat obtuse; fruits nearly obovoid-ellipsoid or subglobose, brown, densely furfuraceous, ca. 3.2 × 2 cm; fruiting pedicels ca. 4 mm in diam.. |
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32 B. furfuracea |
| + |
Leaf blade narrowly elliptic or ovate-elliptic, 5-8(-10) × 2-3.5 cm, adaxially shiny, apex abruptly caudate; fruits ovoid or globose, 2.5-3 × 2.3-2.5 cm; fruiting pedicels ca. 1.5 mm in diam.. |
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33 B. kweichowensis |
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| 13 (11) |
Leaf base decurrent. |
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34 B. intermedia |
| + |
Leaf base not decurrent |
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(14) |
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| 14 (13) |
Lateral veins 9-13 pairs |
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(15) |
| + |
Lateral veins 6-9 pairs |
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(16) |
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| 15 (14) |
Leaf blade elliptic to oblong, 9-21 × 3.5-6 cm; lateral veins 9-13 pairs; fruits 3.3-3.7 × 1.5-2.3 cm, attenuate or subrounded at both ends. |
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38 B. linocieroides |
| + |
Leaf blade elliptic or lanceolate-elliptic, 7-14 × 2-5 cm; lateral veins generally 10 pairs; fruits ca. 2.8 × 1.6 cm, apex apiculate. |
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39 B. henghsienensis |
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| 16 (14) |
Leaf blade ovate to oblong, veins adaxially obscure; fruits ellipsoid, always verruculose. |
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35 B. sichourensis |
| + |
Leaf blade elliptic or narrowly so, veins adaxially conspicuously elevated; fruits narrowly ellipsoid or ovoid-oblong, smooth |
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(17) |
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| 17 (16) |
Fruits narrowly ellipsoid. |
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36 B. percoriacea |
| + |
Fruits ovoid-oblong. |
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37 B. ovoidea |
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| 18 (1) |
Midrib adaxially impressed |
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(19) |
| + |
Midrib adaxially elevated or plane |
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(25) |
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| 19 (18) |
Terminal buds small, densely yellow-brown tomentose or gray-brown villous |
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(20) |
| + |
Terminal buds large, ferruginous tomentose or ferruginous furfuraceous |
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(22) |
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| 20 (19) |
Leaf blade large, obovate, obovate-oblong, or oblong, 15-24 × 7-11 cm; fruits cylindric, up to 5 cm, scattered verruculose. |
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1 B. cylindrica |
| + |
Leaf blade small, elliptic, 4-11 × 1.5-4.5 cm; fruits small, below 2 cm, always verruculose |
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(21) |
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| 21 (20) |
Terminal buds and branchlets densely yellow-brown tomentose or yellow-brown puberulent; leaf blade elliptic to oblong, 6-9(-14) × 1.5-4.5 cm, apex acute with an obtuse acumen or sometimes round or incised, veins conspicuously and densely reticulate on both surfaces, somewhat laxly foveolate when dry. |
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2 B. tsangii |
| + |
Terminal buds and branchlets gray-brown puberulent; leaf blade oblong, 4-7 × 1.5-2.5 cm, apex shortly acuminate or somewhat obtuse, lateral veins and veinlets adaxially inconspicuous but abaxially slightly conspicuous. |
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3 B. muricata |
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| 22 (19) |
Branchlets, leaf blade abaxially, and petioles densely ferruginous tomentose. |
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4 B. obconica |
| + |
Branchlets, leaf blade abaxially, and petioles glabrous or furfuraceous only |
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(23) |
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| 23 (22) |
Petiole 1.5-3 cm. |
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7 B. laevis |
| + |
Petiole 0.6-1.2 cm |
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(24) |
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| 24 (23) |
Leaf blade leathery, lanceolate or narrowly elliptic, adaxially green-brown or gray-brown and abaxially always purplish when dry; fruits large, ellipsoid or subglobose, up to 5 × 4 cm, brown-furfuraceous and rugulose; apex of fruiting pedicels and base of infructescence swollen, 7-15 mm in diam.. |
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5 B. macropoda |
| + |
Leaf blade papery, oblong, abaxially purplish brown and somewhat furfuraceous; fruits ellipsoid, up to 3 × 2.3 cm, narrowed into a stalk at base, ferruginous- furfuraceous when young, dark brown and glabrous when old; fruiting pedicels up to 5 mm in diam.. |
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6 B. purpurascens |
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| 25 (18) |
Leaf blade abaxially not glandular-punctate |
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(26) |
| + |
Leaves abaxially (or sometimes adaxially) densely glandular-punctate |
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(32) |
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| 26 (25) |
Leaf blade leathery, veins densely reticulate, conspicuously minutely foveolate adaxially or on both surfaces |
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(27) |
| + |
Leaf blade leathery, papery, or submembranous, veins laxly reticulate, not foveolate on both surfaces |
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(29) |
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| 27 (26) |
Leaf blade larger, 8-16(-18) × 4-6(-7.5) cm, adaxially conspicuously foveolate; petiole 1-2.5 cm. |
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18 B. yunnanensis |
| + |
Leaf blade smaller, 5-11 × 2-4 cm, adaxially minutely foveolate; petiole 0.6-1.5 cm |
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(28) |
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| 28 (27) |
Leaf blade oblong or oblong-lanceolate, rarely ovate-lanceolate, 5-11 × 2-4 cm, green-brown when dry; fruits dark brown, densely and minutely furfuraceous; fruiting pedicels ca. 2 mm in diam.. |
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16 B. obscurinervia |
| + |
Leaf blade elliptic or narrowly elliptic, 6-9(-12) × 2-3(-5) cm, brownish when dry; fruits black-brown, shiny, smooth; fruiting pedicels 3-4 mm in diam.. |
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17 B. tungfangensis |
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| 29 (26) |
Fruits smooth, but slightly furfuraceous or wrinkled when dry |
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(30) |
| + |
Fruits densely verruculose |
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(31) |
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| 30 (29) |
Leaf blade black-brown when dry, oblong to oblong-lanceolate, 7-10 × 2-4 cm, papery or submembranous; fruits slightly furfuraceous when dry. |
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21 B. ningmingensis |
| + |
Leaf blade abaxially brownish when dry, narrowly elliptic to oblanceolate, 4.5-8.5 × 1.5-3.5 cm, leathery, adaxially densely glandular-spotted; fruits wrinkled when dry. |
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22 B. glandulosa |
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| 31 (29) |
Inflorescences 2-6 cm; fruits ellipsoid or obovoid-ellipsoid, 2-3 × 1-2 cm. |
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19 B. delicata |
| + |
Inflorescences 1.2-1.5 cm; fruits ellipsoid, ca. 3 × 1.3 cm. |
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20 B. brachythyrsa |
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| 32 (25) |
Terminal buds densely ferruginous puberulent or ferruginous hirtellous |
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(33) |
| + |
Terminal buds yellow-brown pubescent or gray-brown pubescent |
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(35) |
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| 33 (32) |
Terminal buds and inflorescences densely ferruginous hirtellous. |
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8 B. rufohirtella |
| + |
Terminal buds and inflorescences densely ferruginous pubescent |
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(34) |
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| 34 (33) |
Leaf blade broadly elliptic or elliptic-lanceolate, 9-14 × 3.5-7 cm, apex obtuse or shortly acuminate, base subrotund or acute; panicles 4-8 cm, many ramified. |
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9 B. wangii |
| + |
Leaf blade lanceolate or narrowly elliptic-lanceolate, 6-13 × 2-4 cm, apex shortly acuminate with an obtuse acumen, base cuneate; panicles ca. 2 cm, few ramified. |
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10 B. shangsiensis |
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| 35 (32) |
Leaf blade submembranous or papery to subleathery, black or black-brown when dry |
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(36) |
| + |
Leaf blade leathery or thinly leathery, not black or black-brown when dry |
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(37) |
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| 36 (35) |
Leaf blade abaxially white glandular-punctate, always alternate, submembranous, oblong to elliptic, apex acuminate, base cuneate or broadly cuneate; petiole 5-13 mm; fruits ovoid, ca. 3.3 × 2.7 cm, fruiting pedicels ca. 2 mm in diam.. |
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11 B. punctilimba |
| + |
Leaf blade abaxially also with glands but not white in color, opposite or sometimes alternate, papery or subleathery, elliptic to elliptic-lanceolate, apex obtuse, obtusely acuminate, acute, or subrounded, base broadly cuneate or rotund; petiole 15-20 mm; fruits ellipsoid, 4-5 × 2-3 cm, fruiting pedicels up to 7 mm in diam.. |
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12 B. roxburghiana |
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| 37 (35) |
Leaf blade large, usually ca. 20 × 6 cm. |
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13 B. pauciflora |
| + |
Leaf blade small, 5-11 × 2-4.5 cm |
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(38) |
| |
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| 38 (37) |
Fruits globose, ca. 1.8 cm in diam., densely brown furfuraceous. |
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14 B. baotingensis |
| + |
Fruits ellipsoid or ovoid-ellipsoid, ca. 1 cm in diam., always verruculose. |
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15 B. appendiculata |
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