Clethra sumatrana J.J.Sm.

Species

Angiosperms > Ericales > Clethraceae > Clethra

Characteristics

Much-branched shrub, or tree with erect or crooked trunk and a dense crown, (3-)5-15 (rarely up to 25) m; bark whitish. Branchlets stoutish, younger parts covered with a rusty stellate tomentum maybe mixed with simple hairs, early glabrescent. Leaves lanceolate to oblong-or obovate-elliptic, apex shortly acutely acuminate, base cuneate, thin-coriaceous, young ones covered with a thick tomentum of rusty to rufous shorter stellate and longer fascicled hairs at least on midrib and nerves, older ones mostly rather persistently so by both or but one type of these hairs on the entire undersurface or only on midrib, nerves and maybe veins, generally distantly serrate with callose teeth especially in the upper part of the lamina, rarely subentire or entire, reddish when young, dark green at maturity, 4-11 (-15) by (1.5-)2-4.5(-8) cm, nerves in 8-13 pairs, curved-spreading, slightly raised beneath as are the transverse veins, reticulation not conspicuous in general; petiole 6-12(-15, rarely up to 30) mm. Racemes elongate, erect-ascendent, 8-30 cm, usually solitary and terminal, more rarely also from the axil of 2 or 3 upper leaves, the latter mostly normal in size and ± persistent, rarely reduced and caducous during anthesis, covered by the same, but generally more dense and more persistent indumentum found in the branchlets and leaves. Pedicels rather slender, 3-10 mm (in fruit 10-20 mm), bracts lanceolate-linear, caducous, 8-15 by 1-2.5 mm. Calyx lobes subovate or ovate-oblong, subacute, rusty-tomentellous or-tomentose in the upper part inside and all over outside, the fascicled hairs few to numerous, (4-)5-6(-8) by 2-3 mm. Petals obovate, erose-crenulate at apex, glabrous, white-creamy to pinkish, (5-)6-7(-9) by 4-5(-6) mm. Filaments linear, glabrous at both ends, longish and subappressedly hirsutu-lous between, 4-5 mm; anthers obsagittate, 1.5-2(-2.5) mm, base extended into an acute triangular appendix. Ovary subappressed-hirsute; style slender, glabrous or with a few hairs at the very base, 6-7 mm at anthesis, 8-12 mm in later stages, apex thickened and very shortly trilobed at anthesis, rarely more deeply so in fruit. Capsule subglobose, hirsutulous, 4-5 mm ø. Seeds sub-obovoid-oblong or subtrigonous, variously compressed, c. 1.5 mm.
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Foliage retention deciduous
Sexuality hermaphrodite
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Environment

In primary and secondary forest, also in Pinus merkusii forest, (390-)900-3000(-3300?) m. Fl. fr. Jan.-Dec.
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Cultivation

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Distribution

Clethra sumatrana world distribution map, present in Indonesia

Identifiers

LSID urn:lsid:ipni.org:names:169518-1
WFO ID wfo-0000890209
COL ID W4GW
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Wikipedia (EN)
Wikipedia (FR)

Synonyms

Clethra pubifolia Clethra sumatrana Clethra longipedicellata Clethra pulcherrima