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FOC | Family List | FOC Vol. 7 | Myristicaceae | Horsfieldia

3. Horsfieldia prainii (King) Warburg, Monogr. Myristic. 292. 1897.

云南风吹楠 yun nan feng chui nan

Myristica prainii King, Ann. Roy. Bot. Gard. Calcutta 3: 299. 1891; Endocomia macrocoma (Miquel) W. J. de Wilde subsp. prainii (King) W. J. de Wilde; Horsfieldia longipedunculata Hu; H. pandurifolia Hu.

Trees to 25 m tall; trunk to 50 cm d.b.h.; twigs terete, pubescent, glabrescent, gray or brown, lenticellate or not, glabrous, longitudinally striate, sometimes cracking. Leaves distichous (?always); petioles short or long, (5-)10-30 mm, glabrescent; leaf blade obovate-oblong, rarely ovate-oblong, widest at or above middle, 20-35 × 8-13 cm, papery or leathery, base shortly to long attenuate or cuneate, sometimes rounded, or slightly decurrent on petiole, apex subobtuse to subacute or rounded; nerves 9-20 pairs, average 20 pairs, raised on both surfaces, lateral veins parallel, distinctly interarching; leaf bud 20-25 × ca. 4 mm, ferruginous pubescent. Inflorescences situated just behind leaves, condensed to lax, usually much branched, often purple, 8-30 cm, rusty stellate pubescent or tomentulose, glabrescent. Plants monoecious. Male flowers: pedicel slender, 1.5-2.5 mm; bud ellipsoid or subglobose, 1-2 mm in diam., yellowish or greenish inside, leathery, lobes 3 or 4(or 5), splitting bud to 3/4, diverging; synandrium stipitate, subglobose, ca. 0.5 mm in diam.; anthers 4-6, column ca. 0.5 mm. Female flowers usually a few mixed among male flowers; female bud ovoid-globose, 2.5-3 × 2.5-2.8 mm, split to 3/4; ovary ovoid, ca. 2 mm in diam., glabrous; stigma 2-lobed, each lobe finely lobulate. Fruiting pedicel 5-20 mm. Fruit ellipsoid to ovoid, 3-4.5 × 1.2-2.5 cm; dry pericarp 1-2.5 mm thick. Seeds 2-3.2 cm, apex acute or shortly beaked; testa variegated; aril orange, at apex either almost entirely closed or laciniate 1/5-1/3 deep.

Primary forests, forests in ravines, valleys; 500-1100 m. S Yunnan [India (Andaman Islands), Indonesia, Papua New Guinea, Philippines, Thailand].

In China, this species has been misidentified as Horsfieldia valida (Miquel) Warburg (Myristica valida Miquel). True H. valida is distributed in Indonesia (Sumatra).


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