Horsfieldia triandra W.j.de Wilde

Species

Angiosperms > Magnoliales > Myristicaceae > Horsfieldia

Characteristics

Low tree. Twigs sometimes faintly ridged, 1.5-3(-4) mm diameter, early glabrescent, hairs rusty, 0.3-0.7 mm long; bark finely, lower down coarsely striate, not flaking; lenticels small but conspicuous. Leaves membranous to thinly chartaceous, (elliptic-)oblong, 5-9 by 2-3.5 cm, base (short-)attenuate, apex acute-acuminate with acumen 8-12 mm long; upper surface glabrous, drying dark olivaceous to dark brown, lower surface brown, early glabrescent; dots absent; midrib raised above, glabrous; nerves 6-10 pairs, flat or ± sunken above; venation lax, faint on both surfaces; petiole 7-13 by 1-1.5 mm; leaf bud 6-8 by 2 mm, with dense rusty hairs 0.3-0.7 mm long. Inflorescences with dense rusty hairs 0.3-0.4 mm; in male: 1 or 2 times branched, 3-5 by 1-2 cm, peduncle 0.3-1 cm long, not many-flowered, (10-20 flowers per inflorescence and in different stages of development), solitary or in loose clusters of 2-4; in female (from infructescences): 0.5-1 cm long, few-flowered; bracts ellipsoid-oblong, pubescent, 2-3 mm long, caducous, and each inflorescence usually with one (rarely two) persistent subapical enlarged bract, resembling a small foliage leaf, 5-12 mm long (see note 1); flowers with 3-lobed perianth, towards the base with fine hairs 0.2-0.4 mm, pedicel pubescent, not articulated. Male flowers: pedicel 3-4 mm long, slender; buds ± obconical-obovoid, apex broadly rounded or blunt, base tapering, 2.5 by 2.5 mm, cleft 1/5-1/6, not collapsing on drying, lobes at apex 0.2, towards base 0.4 mm thick, ± clasping the anthers, at anthesis hardly opening, the basal part of perianth thick-walled, 0.8-1 mm thick; androecium including androphore ± turbinate, 1.5-1.7 by 0.6-0.8 mm, circular in cross section (Plate 2: 45)\ thecae 6, acutish, erect, subsessile, 0.6-0.7 mm long, the apical 0.3 mm free; column solid, below proceeding into ± obconical androphore, 1 by 0.6-0.8 mm. Female flowers not seen. Fruits 1 or 2 per infructescence, broadly ellipsoid, 23-25 by 19-20 mm, drying blackish, glabrescent with remnants of minute indumentum of scattered hairs 0.1 mm or less towards the base; pericarp 1-1.5 mm thick; perianth not persistent.
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Foliage retention evergreen
Sexuality dioecy
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Cultivation

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Distribution

Horsfieldia triandra world distribution map, present in Indonesia

Conservation status

Horsfieldia triandra threat status: Vulnerable

Identifiers

LSID urn:lsid:ipni.org:names:929018-1
WFO ID wfo-0000724972
COL ID 6MDFB
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Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Horsfieldia triandra