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FOC | Family List | FOC Vol. 13 | Myrtaceae

9. Decaspermum J. R. Forster & G. Forster, Char. Gen. Pl. 37. 1775.

子楝树属 zi lian shu shu

Nelitris Gaertner.

Shrubs or trees. Branchlets terete or 4-angled, glabrous or pubescent. Stipules small, filiform, caducous. Leaves opposite, petiolate; leaf blade punctate, pinnately veined, with intramarginal veins. Inflorescences axillary and 1-3-flowered dichasia, racemes, or thyrses, sometimes terminal and paniculate. Flowers bisexual or sometimes staminate, 3-5-merous, often fragrant; bracteoles often small, sometimes caducous. Hypanthium globose, urceolate, or obconiform. Calyx lobes sometimes subequal, persistent. Petals pink or white, punctate. Stamens numerous, in several series; filaments filiform; anthers globular, dorsifixed, dehiscing by longitudinal slits; connectives usually terminating in an apical gland. Ovary 3-13-loculed, placentation axile; ovules 1-2[-4] per locule, collateral. Style filiform; stigma capitate or peltate. Fruit a berry, globular, vertically ribbed, usually 1- or 2-seeded per locule. Seeds separated by a vertical false septum; seed coat and pericarp separate; testa bony; embryo horseshoe-shaped; radicle long; cotyledons short.

About 30 species: SE Asia, Australia, Pacific islands; eight species (five endemic) in China.

Specimens of Decaspermum have flowers that are either perfect or staminate, but it is unclear whether plants with staminate flowers are andromonoecious or androdioecious.

The treatment and descriptions for Decaspermum are largely adapted from Scott (Kew Bull. 34: 59-67. 1979; 35: 403-411. 1980) except for more recently described species. The genus name "Pyrenocarpa" (Hung T. Chang & R. H. Miao, Acta Sci. Nat. Univ. Sunyatseni 1975: 62. 1975), which was not validly published because no type was indicated, was established on the basis of its possessing an 11-13-loculed ovary and fruit with a solitary ovule in each locule; however 9-loculed material of D. hainanense also has been observed. Given the variation in these characters elsewhere in Decaspermum (ovary 3-10-loculed, ovules 2-4 per locule), it is considered that the two Chinese species assigned to "Pyrenocarpa" are better included within the former genus.

1 Inflorescences with flowers solitary or occasionally 2-flowered.   1 D. albociliatum
+ Inflorescences dichasia, racemes, thyrses, or panicles   (2)
2 (1) Flowers 3-merous; ovary 3-loculed.   2 D. gracilentum
+ Flowers (3 or)4- or 5-merous; ovary 4-13-loculed   (3)
3 (2) Branchlets glabrous.   6 D. glabrum
+ Branchlets sericeous, pubescent, or tomentose   (4)
4 (3) Ovary 11-13-loculed   (5)
+ Ovary 4-6-loculed   (6)
5 (4) Branchlet angled; leaf blade oblong, secondary veins 20 on each side of midvein; peduncle angled.   7 D. hainanense
+ Branchlets terete; leaf blade elliptic to obovate, secondary veins 12-15 on each side of midvein; peduncle terete.   8 D. teretis
6 (4) Leaf blade secondary veins 10-20 on each side of midvein, apex acute to acuminate and with an acumen to 2 cm.   5 D. parviflorum
+ Leaf blade secondary veins 5-10 on each side of midvein, apex obtuse, acute, or shortly acuminate   (7)
7 (6) Flowers (3 or)4-merous; calyx glabrous.   3 D. montanum
+ Flowers 4- or 5-merous; calyx sparsely pubescent.   4 D. austrohainanicum

Lower Taxa


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