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8. Goniothalamus (Blume) J. D. Hooker & Thomson, Fl. Ind. 1: 105. 1855.
哥纳香属 ge na xiang shu
Authors: Bingtao Li & Michael G. Gilbert
Polyalthia sect. Goniothalamus Blume, Fl. Javae, Annonaceae, 71, 79. 1830.
Trees or erect shrubs. Petiole short; leaf blade large, secondary veins arcuately looped near margin. Inflorescences axillary or extra-axillary, 1-flowered or several flowers in fascicles. Pedicel bracteolate at base. Sepals 3, valvate. Petals 6, in 2 whorls, with each whorl valvate; outer petals flat, thick; inner petals small, base shortly clawed, apex forming a cap. Stamens many; anther locules linear or oblong, extrorse; connectives oblong or clavate, 3-angular, apex truncate or rarely rounded. Carpels many; ovules 1-10 per carpel, ± basal; styles elongate; stigmas entire or apex 2-lobed. Fruit apocarpous; monocarps subsessile to shortly stipitate, oblong-ellipsoid or ovoid. Seeds 1-10 per monocarp.
About 130-140 species: tropical and subtropical Asia; 11 species (five endemic) in China.
A record of Goniothalamus macrophyllus (Blume) J. D. Hooker & Thomson from the Flora area (X. L. Hou, http://www.abclunwen.com/ lunwen-free-387606/; accessed on 25 Nov 2010) was based on a misidentification of Polyalthia simiarum.
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| 1 |
Leaf blade margin and midvein abaxially densely rust-colored hirsute |
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(2) |
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Leaf blade glabrous throughout |
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(3) |
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| 2 (1) |
Leaf blade 56-76 × 13-19 cm; monocarps 6-9 × ca. 2 cm. |
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1 G. cheliensis |
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Leaf blade 20-41 × 5.5-11.5 cm; monocarps 2-3 × 0.6-0.8 cm. |
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2 G. donnaiensis |
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| 3 (1) |
Inflorescences 3- or 4-flowered; leaf blade abaxially grayish green; inner petals ca. 2 × as long as outer petals. |
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11 G. laoticus |
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Inflorescences 1- or 2-flowered; leaf blade abaxially green, sometimes drying brownish; inner petals much shorter than outer petals |
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(4) |
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| 4 (3) |
Leaf blade narrowly lanceolate to oblong-lanceolate |
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(5) |
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Leaf blade oblong, oblong-elliptic, elliptic, or obovate |
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(7) |
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| 5 (4) |
Branchlets and petioles pubescent; stigmas deeply 2-cleft. |
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3 G. chinensis |
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Branchlets and petioles glabrous; stigmas entire or shallowly 2-cleft |
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(6) |
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| 6 (5) |
Ovaries pubescent; ovules 2 per carpel. |
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4 G. gardneri |
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Ovaries glabrous; ovules 1 per carpel. |
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5 G. gabriacianus |
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| 7 (4) |
Leaf blade thinly papery, secondary veins adaxially flat to depressed; inflorescences 2-flowered |
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(8) |
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Leaf blade papery to leathery, secondary veins adaxially raised; inflorescences 1-flowered |
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(9) |
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| 8 (7) |
Pedicel ca. 4 mm; styles ca. 2 × as long as ovaries; ovules basal; leaf blade secondary veins 7-9 on each side of midvein. |
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6 G. yunnanensis |
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Pedicel 9-15 mm; styles 1-1.5 × as long as ovaries; ovules lateral; leaf blade secondary veins 9-21 on each side of midvein. |
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7 G. leiocarpus |
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| 9 (7) |
Petioles and monocarps pubescent to puberulent. |
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8 G. amuyon |
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Petioles and monocarps glabrous |
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(10) |
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| 10 (9) |
Flowers to 7 cm, ca. 5.5 cm in diam.; outer petals oblong-lanceolate; ovules 2 per carpel; monocarps ca. 1.5 × 1.3 cm. |
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9 G. calvicarpus |
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Flowers to 2.5 cm, ca. 2.5 cm in diam.; outer petals broadly ovate; ovules 6 per carpel; monocarps 3-6 × 2-2.5 cm. |
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10 G. howii |
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List of lower taxa
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