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FOC | Family List | FOC Vol. 5 | Olacaceae

3. Olax Linnaeus, Sp. Pl. 1: 34. 1753.

铁青树属 tie qing shu shu

Trees or shrubs, sometimes climbers. Branchlets unarmed. Leaves alternate; leaf blade pinnately veined. Inflorescences racemelike or spikelike, sometimes paniculate; rachis ± zigzagged before anthesis. Calyx cupular, truncate or obscurely dentate, greatly accrescent in fruit. Petals 3, margin entire or deeply 2-lobed, free or connate at base. Stamens 3, basally adnate to petals; filaments flat; anthers oblong; staminodes 5, 2-cleft. Disk annular. Ovary superior, 3-loculed below, 1-loculed above, placenta central, free; ovules 3. Style short or elongate; stigma capitellate, minutely 3-lobed. Drupe ellipsoid to ± globose, basal 1/2 to near apex covered by persistent calyx, 1-seeded; endosperm copious.

About 40 species: tropical Africa, Asia, and Australia; three species (one endemic) in China.

1 Petals 3-4 mm, not 2-lobed; inflorescences 1-1.5 cm; leaf blade apex acuminate; fruiting calyx 0.8-0.9 cm.   3 O. acuminata
+ Petals 8-13 mm, 2 petals 2-lobed; inflorescences 1.5-5 cm; leaf blade apex acute; fruiting calyx 1.4-2 cm.   (2)
2 (1) Drupe 1.5-2 cm, nearly covered by accrescent calyx; inflorescences 1.5-2.5 cm; pedicel 1-3 mm; petals blackish when dried.   1 O. imbricata
+ Drupe 2.8-3.8 cm, basal 1/2 covered by accrescent calyx; inflorescences 3.5-5 cm; pedicel 3-10 mm; petals yellowish when dried.   2 O. austrosinensis

Lower Taxa


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