Strychnos spinosa Lam.

Natal orange (en)

Species

Angiosperms > Gentianales > Loganiaceae > Strychnos

Characteristics

Trees 3-9 m tall, bark often somewhat corky, flaking in rectangular pieces, leaving smooth white patches. Branchlets usually armed, from slender and shiny 'varnished' to fairly thick, dull and pale coloured, glabrous or puberulous, persistent leaf-bases somewhat prominent, upturned, sparsely setose in the axils, lateral and terminal twigs sometimes reduced to spines (coppice shoots very spinous); spines slender and straight to fairly thick and somewhat recurved, sometimes rudimentary. Leaves obovate-oblong, ovate-oblong or suborbicular, 5-nerved (rarely 7-nerved) from near the base, tertiary veins faint to fairly distinct, variable in shape, size and pubescence, often (a) leaves small, on an average 2-4. 5 cm long and 1-2. 5 cm broad, broadly rounded at the apex, somewhat cuneate at the base, glabrous or with hairs in the axils of the nerves below, rarely (b) leaves medium to large, on an average 5-7 cm long and 3.5-6 cm broad, abruptly narrowing in the upper third into a distinct blunt acumen, broadly cuneate to rounded at the base, thin in texture, or (c) leaves large, 5-9.5 cm long and 3-6 cm broad, sub-orbicular, puberulous on both surfaces (the form nearest subsp. lokua of tropical Africa); petioles 5-7 mm long. Cymes terminal on the branchlets and on the short lateral twigs, arranged in pseudo-umbels on more or less 1 cm long peduncles, pedicels and peduncles puberulous; bracts from about 2-4 mm long, linear acuminate from a rather broad and somewhat vaginating base. Calyx pubescent without at least at the base, 5-lobed almost to the base; lobes linear subulate about 5ú5 mm long, about as long as the corolla of the mature flower, sometimes slightly longer or slightly shorter. Corolla pale green to greenish white, buds oblong-globose overtopped by the calyx-lobes, open corolla about 4 mm long, 5-lobed to about midway, glabrous within except for a dense fringe of hair at the throat, glabrous or rarely puberulous without. Stamens inserted at the base of the tube, filaments about as long as the anthers; anthers with their tops reaching to the throat of the corolla, minutely apiculate, cells bearded near the base. Ovary 1-celled sometimes 2-celled at base, subglobose, puberulous at least in upper portion, abruptly narrowed into a short style; stigma terminal, conical, about as long as the style; disc at base of ovary not protruding. Fruit green, becoming yellow, large, globose, 6-9 cm diam., rind thick and woody, not completely smooth and sometimes conspicuously warty outside; seeds many embedded in pulp; seed coats thin, shrinking with the endosperm.
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Shrub or small tree with spreading habit, up to 6.5 m. high; bark sometimes reticulate and irregularly corky but never thick; young branchlets varying from pale to dark mottled or concolorous, glabrous to shortly pubescent, sometimes longitudinally ridged and often powdery corky; spines slender to stout, straight or curved, sometimes absent.. Leaves shortly petiolate; lamina membranous to coriaceous, ovate, obovate or elliptic, 3–8 cm. long, 1.3–7 cm. wide, rounded, subacute or more rarely acute or emarginate and often apiculate at the apex, cuneate or more rarely rounded at the base, matt or shiny, 3–7-nerved at or just above the base, with hair-pockets sometimes visible in the angles, indumentum of lamina varying on both surfaces from pubescent to glabrous.. Cymes terminal; peduncle and pedicels spreading-pubescent.. Calyx-lobes narrowly deltoid to linear, 3.5–5.5 mm. long, shorter or longer than the corolla, acuminate, usually glabrous except for the base, very rarely pubescent up to the lobes.. Corolla greenish-white; lobes deltoid, subacute, about half the length of the corolla-tube, with dense hairs forming a ring at the base.. Anthers densely bearded at the base.. Ovary broadly ovoid, unilocular; ovules numerous.. Fruit globose, 5–12 cm. in diameter; rind woody, yellow; seeds numerous, flat and disk-like, 1.5–2 cm. long, embedded in fleshy yellow edible pulp.
A shrub which loses some of its leaves during the year. It can be spiny. It grows 4-5 m tall and can be 9 m tall. It has a large rounded crown. There can be one or several trunks. The branches can be flexible or stiff and smooth or hairy. The branches have spines in pairs which are 7 mm long and have a black tip. They are slightly curved backwards. The bark is grey brown and scaly. On old branches the bark becomes corky. The leaves are oval and up to 10 cm long. They are shiny green and hairy. They are produced opposite each other. They tend to be hairy and have 3-5 veins which start near the base of the leaf. The leaf base is wedge shaped. The flowers are small and pale green. They occur in groups at the ends of branches. The fruit is round and 5-17 cm across. It is green and becomes light brown at maturity. Sometimes the fruit is prickly. The fruit have a hard shell. The flesh of the ripe fruit is edible. The seeds are flat and poisonous. Fruit from trees with short fruit stalks are sweet while fruit from trees with long fruit stalks and narrow leaves are bitter.
Leaves on main axis sometimes ternate; petiole 2–10 mm. long, glabrous or pubescent; lamina coriaceous also when living, young thinner and papyraceous when dry, very variable in shape and size, orbicular, elliptic, narrowly elliptic, ovate, or obovate, 1–2(3) x as long as wide, sometimes comparatively wider or narrower on main axis, usually comparatively wider on flowering branches, 1·4–9·5 x 1·2–7·5 cm., rarely larger, up to 13·5 x 7·5 cm., emarginate, rounded to acute and often apiculate, sometimes acuminate (mostly in trees along water courses), or rarely abruptly acuminate at the apex, cuneate, less often rounded, or sometimes on main axis subcordate at the base, often with hair pockets in the angles of the main veins beneath, glabrous or pubescent on both sides (in sucker shoots and seedlings of plants with few hairs more hairy, smaller and cordate); 1–3 pairs of distinct secondary veins from above the base curved along the margin.
Tree or shrub, 1-10 m high. Leaves decussate, glabrous, shiny both sides, elliptic, oblong or narrowly ovate, apex apiculate, margins revolute; petioles up to 10 mm long. Inflorescence terminal, dense. Flowers 5-merous, cream-coloured. Calyx green, connate at base, apex acuminate, 4-lobed. Corolla 4-lobed, green, glabrous; tube short, campanulate. Stamens inserted on corolla tube; anthers oblong; filaments glabrous, short. Ovary with up to 120 ovules; style straight, stigma oblong. Flowering time Aug.-Mar. Fruit 1-seeded, globose, yellow, hard, small. Seeds elliptic or ovate, testa thick.
Corolla when mature 0·8–2·7 x as long as the calyx, .4–5(3·8–6) mm. long, pale green, greenish, or less often white, creamy, or yellow, glabrous or sparsely pubescent outside, inside with a narrow entire white–penicillate corona at the mouth of the tube; tube 1·2–2·7 x as long as the lobes, 2·5–3(2·2–4·4) x 2–3(3·5) mm., urceolate or campanulate, often somewhat contracted in the throat; lobes triangular, 1·2–1·8 x as long as wide, 1·2–2 x 1–1·5 mm., acute, erect or suberect.
Sepals pale green, connate at the base, narrowly triangular to linear, equal, subequal, or sometimes unequal, 2–6(10) x as long as wide, 1·5–6 x (0·3)0·5–1·2 mm., acuminate or subulate at the apex, minutely ciliate at the base or not, outside mostly sparsely pubescent at the base and glabrous at the apex or entirely glabrous, never with an even indumentum all over, inside glabrous and usually with some hairs at the base or sometimes minutely pubescent, without colleters.
Fruit yellow or when nearly mature yellow–green or green, large, hard, resembling an orange or a grapefruit, globose, often slightly shining, with granular skin, 7–11(15) cm. in diam., with about 10–100 seeds, immature often slightly pear–shaped. Wall rather thick, hard, 2–5(8) mm., thick, thickened inside above the pedicel. Pulp yellow, edible.
Tree, 3-9 m high. Lateral and terminal twigs often converted into spines. Bark not very thickly corky; ultimate twigs from thin and varnished to thick, dull and light-coloured, sometimes puberulous. Inflorescence terminal. Ovary 1-celled. Fruit large, 60-90 mm in diameter, many-seeded. Flowers pale green to greenish white.
Seed ochraceous in fruit, very pale brown when dried up, darkening in rotten fruits, obliquely ovate or elliptic, flattened, more or less plano–convex, usually irregularly curved, about 1–2 x as long as wide, 11 x 6 x 2–23 x 18 x 5 mm., mostly smooth, very shortly pubescent.
Stamens included; filaments glabrous, 0·7–1·5 x as long as the anthers, inserted at 0·4–0·8 mm. from the base of the corolla; anthers oblong or elliptic, 1·2–1·4 x 0·8–1 mm., ciliate with a villose or sometimes pilose indumentum all around by which they are coherent.
Branches sometimes deeply ringed at nodes, grey or brown, not lenticellate, often with curved or straight spines; branchlets glabrous or pubescent, green or yellow–green when fresh, green or brown and often sulcate when dry, sometimes terminating in a straight spine.
Trunk 4–15 cm. in diam. (sometimes Huted), branched from below; bark pale to dark grey or brown, shallowly fissured, not or sometimes thinly corky, often scaly, sometimes blackened by bush fire, not lenticellate; wood hard, whitish, without bark–islets.
Usually thorny tree with corky bark to 9 m. Leaves ovate to suborbicular, 5-7-veined from base. Flowers in terminal cymes, greenish white, calyx lobes awl-shaped, 5 mm long. Fruits turning yellow, 60-90 mm diam.
Pistil pubescent, rarely obscurely so, glabrous just below the stigma, 1·8–2·4(3) mm. long; ovary ovoid, broadly ovoid, or globose, (1)1·2–1·6(2) x 1–1·3 mm., 1–celled; stigma subsessile, oblong.
Deciduous shrub or small tree, (0·30)1–6(10) m. high, sometimes flowering on first year shoots (with small leaves) on old fire–cut stumps.
Inflorescence terminal, seemingly umbellate, congested or less often not, 1·5 x 1·5–5 x 3·5(6–5 x 7) cm., mostly many–flowered.
A small tree up to 20 ft. high with light spreading crown and branches armed with spines
One large globose basal placenta with about 60–120 ovules.
Branchlets and leaves sometimes softly pubescent
Flowers greenish-white, in short compound cymes
Fruit with a hard yellow shell
Flowers 5–merous.
Corolla not split
Testa thick.
Life form perennial
Growth form tree
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) -
Mature height (meter) 5.05 - 9.0
Root system -
Rooting depth (meter) 1.5
Root diameter (meter) -
Flower color
Blooming months -
Fruit color
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

A tropical plant. It grows in the drier areas of tropical Africa. It grows in the Sahel. It is in open woodland and secondary forest. It grows in areas with more than 500 mm rainfall per year. It will grow on slopes and ridges and is a tough tree. It grows up to 1,500 m altitude. In West Africa it grows up to 2,200 m altitude. It can grow in arid places. It grows in Miombo woodland in Africa. It suits hardiness zones 10-12.
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Woodland, bush savannah and sometimes in galleried forest at elevations up to 2,200 metres. Found in a wide variety of dry woodland, thickets and savannah woodland, frequently on sandy loams of river banks, at elevations from 400-2,200 metres.
In savanna woodland.
Light -
Soil humidity -
Soil texture 6-7
Soil acidity -
Soil nutriment -
Hardiness (USDA) 10-12

Usage

CAUTION: The seeds are poisonous. The skin is poisonous. Unripe fruit will cause vomiting. The fruit pulp is eaten when fully ripe. It will not keep well. In some places it is cooked. It can be sun dried then stored. It is added to maize meal porridge. The fruit is fermented into a drink. It is also used for jam and jellies. The young leaves are eaten. CAUTION: Many Loganiaceae are very poisonous.
Uses animal food charcoal environmental use fodder food food additive fuel gene source material medicinal non-vertebrate poison oil poison social use timber vertebrate poison wood
Edible fruits leaves seeds
Therapeutic use Poison (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

It can be grown from seeds or basal shoots. It can also be grown from root cuttings. The seed has a hard seed coat so should be treated either by putting in hot water or by burning. It can be grown by grafting.
Mode cuttings seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment soaking
Minimum temperature (C°) -
Optimum temperature (C°) 20 - 28
Size -
Vigor -
Productivity -

Images

Leaf

Strychnos spinosa leaf picture by Gerd Luedke (cc-by-sa)
Strychnos spinosa leaf picture by susan brown (cc-by-sa)
Strychnos spinosa leaf picture by Gerd Luedke (cc-by-sa)

Flower

Strychnos spinosa flower picture by susan brown (cc-by-sa)
Strychnos spinosa flower picture by susan brown (cc-by-sa)
Strychnos spinosa flower picture by susan brown (cc-by-sa)

Fruit

Strychnos spinosa fruit picture by Gerd Luedke (cc-by-sa)
Strychnos spinosa fruit picture by Balasundaram Balasundaram Krishnamurthy (cc-by-sa)
Strychnos spinosa fruit picture by cinturao Dr Candido (cc-by-sa)

Distribution

Strychnos spinosa world distribution map, present in Angola, Benin, Burkina Faso, Botswana, Central African Republic, Côte d'Ivoire, Cameroon, Congo, Ethiopia, Gabon, Ghana, Guinea, Gambia, Guinea-Bissau, Equatorial Guinea, Kenya, Liberia, Madagascar, Mozambique, Mauritius, Malawi, Mayotte, Namibia, Nigeria, Réunion, Sudan, Senegal, Sierra Leone, Somalia, South Sudan, eSwatini, Seychelles, Togo, Tanzania, United Republic of, Uganda, United States of America, South Africa, Zambia, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:547485-1
WFO ID wfo-0000502889
COL ID 6ZYB8
BDTFX ID -
INPN ID 706845
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Strychnos courtetii Strychnos leiosepala Brehmia spinosa Strychnos vuntac Strychnos gracillima Strychnos schweinfurthii Strychnos tonga Strychnos volkensii Strychnos miniungansamba Strychnos carvalhoi Strychnos euryphylla Strychnos megalocarpa Strychnos omphalocarpa Strychnos emarginata Strychnos gilletii Strychnos cardiophylla Strychnos cuneifolia Strychnos flacurtii Strychnos lokua Strychnos laxa Strychnos buettneri Strychnos harmsii Strychnos radiosperma Strychnos rhombifolia Strychnos mueghe Strychnos djalonis Strychnos pluvialis Strychnos gracillima var. paucispinosa Strychnos spinosa var. pubescens Strychnos unguacha var. retusa Strychnos spinosa subsp. lokua Strychnos spinosa subsp. spinosa Strychnos sansibariensis Strychnos spinosa