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FOC | Family List | FOC Vol. 19 | Annonaceae

14. Polyalthia Blume, Fl. Javae, Annonaceae. 68. 1830.

暗罗属 an luo shu

Authors: Bingtao Li & Michael G. Gilbert

Trees or shrubs. Inflorescences axillary, internodal, or leaf-opposed, sessile or shortly pedunculate, 1- to many flowered. Flowers usually bisexual. Sepals 3, usually small, valvate or rarely subimbricate in bud, free. Petals 6, in 2 whorls, free, valvate or rarely subimbricate in bud, subequal, flat and spreading; inner petals sometimes slightly larger or smaller than outer, concave and arched over stamens. Stamens usually many; anther locules cuneate; connectives apically orbicular or rhomboidal, concealing anther locules, apex flat-topped or slightly convex. Carpels rather few to many, free; ovules 1 or 2(or 3) per carpel, basal or sutural; styles absent, very short, or long; stigmas mostly dilated. Fruit apocarpous; monocarps few to many, short to long stipitate, mostly globose or ovoid, fleshy. Seeds 1 or 2(or 3) per monocarp, with a longitudinal circumferential groove.

About 120 species: Old World tropics from Africa to the W Pacific, with the center of distribution in SE Asia; 17 species (six endemic, one introduced) in China.

Molecular data (Mols et al., Amer. J. Bot. 91: 590-600. 2004) have shown that Polyalthia as traditionally delineated is polyphyletic and will eventually have to be divided among several genera.


Key to flowering material

1 Inner petals 0.2-1 cm   (2)
+ Inner petals (1-)1.3-9 cm   (6)
       
2 (1) Sepals 8-9 mm.   8 P. cerasoides
+ Sepals 2-2.5 mm   (3)
       
3 (2) Leaf blade leathery, glabrous; carpels at least partly hairy.   9 P. littoralis
+ Leaf blade membranous to papery, adaxially minutely hairy along midrib; carpels glabrous or pubescent   (4)
       
4 (3) Inner petals ca. 3.5 mm; carpels ca. 7, glabrous.   10 P. florulenta
+ Inner petals ca. 10 mm; carpels many, pubescent   (5)
       
5 (4) Leaf blade 5-11 × 2-4 cm, secondary veins inconspicuous; stigmas glabrous.   12 P. suberosa
+ Leaf blade 13.5-24 × 4-5 cm, secondary veins raised; stigmas villous.   15 P. lancilimba
       
6 (1) Petals 6-9 cm   (7)
+ Petals (1-)1.3-5.5 cm   (8)
       
7 (6) Sepals ca. 12 mm.   2 P. litseifolia
+ Sepals 3-5 mm.   17 P. liukiuensis
       
8 (6) Petals 0.6-3 cm wide   (9)
+ Petals 0.2-0.5 cm wide   (11)
       
9 (8) Leaf blade secondary veins 24-28 on each side of midvein.   7 P. pingpienensis
+ Leaf blade secondary veins 7-18 on each side of midvein   (10)
       
10 (9) Petiole puberulent; leaf blade secondary veins 7-10 on each side of midvein; inflorescences several flowered; petals 2-3.5 × 1-1.5 cm.   11 P. laui
+ Petiole glabrous; leaf blade secondary veins 14-18 on each side of midvein; inflorescences 1-flowered; petals 3-5.5 × 1.5-3 cm.   16 P. rumphii
       
11 (8) Pedicel 1-1.8 cm; petals white, 1-1.3 cm.   14 P. obliqua
+ Pedicel 2-4 cm; petals green to yellow, 1.3-3.8(-5) cm   (12)
       
12 (11) Leaf blade margin undulate, secondary veins 18-24 on each side of midvein.   13 P. longifolia
+ Leaf blade margin not undulate, secondary veins 13-20 on each side of midvein   (13)
       
13 (12) Petals densely minutely hairy, to 3.8(-5) cm.   4 P. fragrans
+ Petals glabrous or only very sparsely hairy on inside, 1.3-3.5 cm   (14)
       
14 (13) Leaf blade with pellucid dots; ovaries pubescent and with 1 basal ovule.   5 P. simiarum
+ Leaf blade without pellucid dots; ovaries glabrous and with 2 ovules   (15)
       
15 (14) Branches and leaf midvein and secondary veins pubescent; leaf blade 18-28 × 5-8.5 cm, smooth; petals ca. 3 cm.   6 P. viridis
+ Branches and leaf midvein and secondary veins glabrous; leaf blade 9-17 × 2.5-5 cm; petals ca. 1.3 cm   (16)
       
16 (15) Leaf blade membranous, densely verrucate, secondary veins 15-18 on each side of midvein, apex acuminate.   1 P. verrucipes
+ Leaf blade thinly papery, not verrucate, secondary veins 8-10 on each side of midvein, apex caudate.   3 P. chinensis

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