Rhus L.

Sumac (en), Sumac (fr)

Genus

Angiosperms > Sapindales > Anacardiaceae

Characteristics

Erect or scandent shrubs, trees, or lianas, sometimes hemi-epiphytic, mostly deciduous. Leaves spiral, imparipinnate, trifoliolate, unifoliolate, rarely simple (R. borneensis), petioled; venation (in Mal. spp.) not reticulate, no areolae. Leaflets usually opposite or subopposite, entire, rarely crenate-dentate; without or with (glabrous pit-like) domatia (Fig. 65b-c), or sometimes with a spot-like group of reddish brown papillae or glands (Fig. 65h-i) in the axils of the nerves beneath. Inflorescences paniculate, rarely racemose and few-flowered, terminal, axillary, sometimes pseudoterminal (then terminal bud of the twig present). Flowers unisexual or bisexual (plants dioecious, sometimes polygamous, or polygamo-dioecious). Calyx 5-lobed. Petals 5, imbricate, glabrous, rarely hairy on the inner surface. Stamens 5; filaments subulate, glabrous; anthers dorsifixed, imperfect or sterile in ♀. Disk intrastaminal, discoid, shortly cupular, or round and flat. Ovary 1-celled, abortive in ♂; style short, distinct or obscure; stigmas 3, free or united, capitate or obscure. Pistillode in ♂ very small. Drupe 1-celled; endocarp coriaceous, crustaceous or bony. Seed with the testa adhering to the endocarp or free from it; embryo straight, cotyledons free, flat.
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Suffrutices, shrubs or trees. Leaves alternate, simple, 3-foliolate or imparipinnate, rarely digitately 5-foliolate. Inflorescences of terminal and/or axillary panicles. Flowers unisexual, occasionally bisexual, very small. Male flowers: calyx (4–)5(–6)-partite, segments imbricate; petals (4–)5(–6), longer than the calyx, imbricate; stamens 5, filaments subulate, inserted below the disk, anthers ovate, dorsifixed, introrse; disk saucer-or cup-shaped; pistillode usually absent. Female flowers: perianth similar to ♂; staminodes frequently present; ovary ovoid to subglobose, usually unilocular, with the ovule pendent from an ascendent funicle inserted at the base of the locule; styles 3, apical, free or occasionally connate at the base; stigmas somewhat capitate. Drupe globose or ovoid and compressed, frequently asymmetrical, glabrous or hairy; mesocarp fleshy, somewhat resinous, sometimes rather dry; endocarp bony or crustaceous. Seed ovoid or reniform, compressed, with a thin testa; cotyledons very compressed.
Trees or (not in Australia) shrubs, sometimes lianes. Leaves alternate, compound or (not in Australia) simple. Inflorescence terminal and axillary. Flowers unisexual or (not in Australia) bisexual. Calyx lobes 5. Petals mostly 5, imbricate. Disc present. Male flowers: stamens 5; anthers dorsifixed, introrse to latrorse; pistillode present. Female flowers: staminodes present; ovary 1-locular with 1 ovule attached to wall near base by a long funicle; style sometimes obscure; stigmas 3, free or united. Fruit a drupe, 1-locular, 1-seeded; exocarp membranous; mesocarp ±resinous; endocarp coriaceous, crustaceous or bony. Seed with testa adhering to or free from endocarp. Embryo straight; cotyledons free, flat.
Trees or shrubs, sometimes climbing, usually dioecious, usually deciduous, sometimes evergreen but not in N.Z. Sap resinous or milky. Lvs usually imparipinnate, sometimes 3-foliolate or simple. Panicles terminal or axillary, bracteate. Calyx 5-partite; segments imbricate, sometimes unequal. Petals 5, ± imbricate, inconspicuous. ♂ fls with 5 stamens and rudimentary pistil. ♀ fls 1-celled; styles 3; stigmas ± capitate. Drupe globose or compressed; exocarp thin, glabrous or hairy; mesocarp resinous; endocarp ± bony; stigmas often persistent.
Deciduous shrubs or trees, polygamous or dioecious. Leaves imparipinnately compound; leaf rachis sometimes winged; leaflets petiolate or sessile, with serrate or entire margin. Inflorescence terminal, paniculate or thyrsoid, floral subtending bracts persistent or deciduous. Flowers functionally unisexual or bisexual, 5-merous. Ovary 1-locular and 1-ovulate; styles 3, often united basally. Drupe globose, slightly compressed, mixed glandular pubescent and pilose, red at maturity; exocarp and mesocarp united; mesocarp glutinous, red.
Pet 5, often hairy, especially on the inner surface; stamens 5; ovary 3-carpellate but unilocular, with a short, terminal, 3-lobed style; ovule basal; frs red or reddish, glandular-hairy; innocuous, polygamo-dioecious shrubs or small trees with dense, crowded infls terminal or lateral on last-year’s twigs. (Schmaltzia) 100, cosmop.
Female flowers: perianth similar to that of the male; staminodes frequently present; ovary ovoid to subglobose, usually 1-locular, with the ovule pendent from an ascendent funicle inserted at the base of the loculus; styles 3, apical, free or connate at the base; stigmas ± capitate.
Male flowers: calyx (4)5(6)-partite, the segments imbricate; petals (4)5(6), longer than the calyx, imbricate; stamens 5; filaments subulate, inserted below the disk; anthers ovate, dorsifixed, introrse; disk patellifonn or cupuliform; pistillode usually absent.
Drupe globose or ovoid and compressed, frequently asymmetrical, glabrous or hairy; mesocarp fleshy, ± resinous, sometimes ± dry; endocarp bony or crustaceous.
Leaves alternate, simple, 3-foliolate or imparipinnate, rarely digitately 5-foliolate.
Seed ovoid or reniform, compressed, with a thin testa; cotyledons very compressed.
Flowers unisexual, exceptionally bisexual, very small.
Panicles terminal, axillary or both, ± branched.
Shrublets, suffrutices, shrubs or trees.
Life form perennial
Growth form
Growth support -
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) -
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

In Malesia usually in primary or montane forest, sometimes in savannahs, in mossy and inundated forest, or in secondary forest, from sea-level up to 2400 m.Several species may occur obviously as hemi-epiphytes, e.g. R. caudata, R. lenticellosa, R. linguata, and R. nodosa, similarly as in Spondias.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-10

Usage

Uses. No uses known of native species. Growing the Sino-japanese lacquer yielding R. vernicifera DC. has been unsuccessful (BURKILL) and suggestions to attempt this quite unrealistic (HEYNE).
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Some species cultivated as ornamentals.
Uses ornamental
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 30 - 90
Germination temperacture (C°) 18 - 21
Germination luminosity -
Germination treatment soaking
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -