Hopea helferi

• Overview
• Description
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Overview

Critically Endangered

Description

Family Dipterocarpaceae

Trees , evergreen or semievergreen, rarely deciduous in dry season . Xylem with aromatic resin in intercellular resin canals. Branchlets with stipular scars , sometimes annular . Leaves simple , alternate; stipules persistent or caducous , large or small; leaf blade with lateral veins pinnate, margin entire or sinuate-crenate. Inflorescences few- or many-flowered, terminal or axillary racemes or panicles; flowers usually sweetly scented; bracts usually fugacious and minute, rarely persistent and large. Inflorescences, calyces, petals, ovary, and other parts usually with stellate , squamate , fascicled or free-standing hairs . Flowers bisexual , actinomorphic , contorted. Calyx lobes 5, free or united at base , imbricate in bud if not united. Petals 5, adnate or connate at base. Stamens (10-) 15 to many, free from or connate to petals; filaments usually dilated at base; anthers 2-celled, with 2 pollen sacs per cell (Chinese species) ; connective appendages aristate , filiform or stout. Ovary superior, rarely semi-inferior, slightly immersed in torus, usually 3-loculed, each locule 2-, rarely many ovuled; ovules pendulous, lateral or anatropous . Fruit usually nutlike, sometimes capsular and 3-valved, 1(to many) -seeded, with persistent, variously accrescent calyx of which 2 or more lobes are usually developed into lorate wings. Seed exalbuminous ; cotyledons fleshy , equal or unequal, applanate or folded or cerebriform , entire or laciniate ; radicle directed toward hilum , usually included between cotyledons.

About 17 genera and 550 species: tropical Africa, Asia, and South America (in Asia, most species and genera in NW Borneo) ; five genera and 12 species (one endemic, one introduced ) in China.[1]

Genus Hopea

Trees evergreen , of main canopy or understory , white resinous . Stipules caducous , small; leaf blade thinly leathery; lateral veins pinnate; tertiary veins scalariform (in Chinese species) [or subreticulate], margin entire. Flowers sessile or shortly pedicellate , in lax panicles of unilateral racemes ; bracts early caducuous, linear . Calyx segments imbricate. Exposed parts of petals usually pubescent in bud. Stamens (10-) 15, slightly connate and adnate to petals; anthers ovoid , small, subequal ; connectival appendages aristate or filiform . Ovary ovoid, with prominent filiform style, or hourglass-shaped, with short tapering style. Fruit ovoid or globose ; pericarp usually thin, waxy; 1-seeded, closely surrounded by thickened base of calyx segments; 2 fruit sepals winglike, linear, or all orbicular or ovate , subequal.

About 100 species: Cambodia, China, S India, Indonesia, Laos, Malaysia, Myanmar, Papua New Guinea, Philippines, Thailand, Vietnam; four species (one endemic) in China.

These trees are a source of a damar resin used in varnishes. The wood is finely grained, very durable, and used for making boats , bridges , and furniture.[2]

Habitat

Ecology: A large tree found in semi-evergreen and evergreen forests .[3]

Taxonomy

Notes

Publishing author : Brandis & C.E.C.Fisch. Publication : Bull . Misc. Inform. Kew 1927, 206, descr. ampl.

Similar Species

Members of the genus Hopea

ZipcodeZoo has pages for 200 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

H. acuminata · H. aequalis · H. albescens · H. altocollina · H. andamanica · H. andersonii · H. andersonii basalticola · H. anomala · H. apiculata · H. aptera · H. argentea · H. aspera · H. auriculata · H. avellanea · H. balangeran · H. bancana · H. basilanica · H. beccariana · H. bilitonensis · H. borneensis · H. brachyptera · H. bracteata · H. brevipetiolaris · H. bullatifolia · H. cagayanensis · H. canarensis · H. celebica · H. celtidifolia · H. centipeda · H. cernua · H. chinensis · H. conduplicata · H. cordata · H. cordifolia · H. coriacea · H. curtisii · H. dalingdingan · H. dasyrrachis · H. dasyrrhachia · H. dasyrrhachis · H. dealbata · H. decandra · H. depressinerva · H. discolor · H. diversifolia · H. dolosa · H. dryobalanoides · H. dyeri · H. eglandulosa · H. enicosanthoides · H. erosa · H. exalata · H. fagifolia · H. faginea · H. ferrea · H. ferruginea · H. floribunda · H. fluvialis · H. forbesii · H. foxworthyi · H. fulvialis · H. garangbuaya · H. glabra · H. glabrifolia · H. glaucescens · H. globosa · H. glutinosa · H. gracilis · H. grandiflora · H. gratissima · H. gregaria · H. griffithii · H. grisea · H. hainanensis · H. hasskarliana · H. heimiana · H. helferi · H. hongayanensis · H. hongayensis · H. inexpectata · H. intermedia · H. iriana · H. jacobi · H. javanica · H. jianshu · H. johorensis · H. jucunda · H. jucunda jucunda · H. jucunda modesta · H. juncunda · H. kelantanensis · H. kerangasensis · H. laevifolia · H. laevis · H. lanceolata · H. latifolia · H. laxa · H. linggensis · H. longiflora · H. longifolia

More Info

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Further Reading

• Ashton, P.S. 1990. Annotations to: conservation status listings for Dipterocarpaceae.
• Balakrishnan, N.P. and Nair, N.G. 1983. New taxa and record from Saddle Peak, Andaman Islands. Bulletin of the Botanical Survey of India 24(1): 28-36.
• Tong Shaoquan & Tao Gouda. 1990. Dipterocarpaceae. In: Li Hsiwen, ed., Fl. Reipubl. Popularis Sin. 50(2): 113-131.

Notes

Contributors

• Ashton, P. 1998. In IUCN 2008. 2008 IUCN Red List of Threatened Species. IUCNRedList.org. Downloaded July 19, 2008.

Identifiers

• Biodiversity Heritage Library NamebankID: 5883641
• Global Biodiversity Information Facility Taxonkey: 15453244
• Globally Unique Identifier: urn:lsid:ipni.org:names:320912-1
• International Plant Names Index (IPNI) ID: 320912-1
• IUCN ID: 32506
• Zipcode Zoo Species Identifier: 1020846

Footnotes

1. Xi-wen Li, Jie Li & Peter S. Ashton "Dipterocarpaceae". in Flora of China Vol. 13 Page 48. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
2. "Hopea". in Flora of China Vol. 13 Page 48, 49. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
3. Ashton, P. 1998. In IUCN 2008. 2008 IUCN Red List of Threatened Species. IUCNRedList.org. Downloaded July 19, 2008. [back]

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