Brachystegia allenii Hutch. & Burtt Davy

Species

Angiosperms > Fabales > Fabaceae > Brachystegia

Characteristics

Tree 3–15(–20) m. high, glabrous; bark rough, persistent, usually deeply fissured and transversely cracked, pale grey; crown rounded; foliage bushy (see notes below), maturing blue-grey, especially beneath.. Branchlets often rusty-yellow where pale grey epidermis peels.. Stipules shortly connate (or ± free but partly intrapetiolar), linear to falcate, 0.5-l(–2) cm. long, usually subpersistent; auricle often more persistent, broadly reniform, 0.3–1 (–2) cm. long, rarely undeveloped; intrapetiolar stipule-bases persistent but often very short and obscure, subtending flattened and laterally keeled dormant buds.. Leaves with (3–)4–5(–6) subequal pairs of leaflets or the middle pairs the largest; petiole (1–)1.5–2.5 cm. long; rhachis (4–)6–15(–18) cm. long, ± channelled, with or without spreading stipels or short narrow wings; leaflets subcircular or broadly oblong to obovate, (1.5–)2–6 × (1–)1.5–4 cm., emarginate or subtruncate to rounded at apex, cordate to truncate and subsymmetrical at base; midrib subcentral; basal fanwise nerves (3–)4–5(–6); nerves conspicuous; veins very closely reticulate.. Panicles terminal or terminal and axillary, slender, 4–7 × 3–7 cm.; branches rather long, usually subtended at anthesis by pairs of stipular auricles or complete stipules, with or without reduced 1–3-jugate leaves.. Flowers cream-yellow or with rose-pink bracteoles and white tepals; bracteoles 5–8 × 3–4 mm.. Tepals (4–)5(–8), all sepaloid or more rarely (4–)5 ± 1–3, usually all free; outer (4–)5, ovate to spathulate, usually unequal, ± imbricate, 2–4 × 1–2 mm., ± densely long-ciliate, sometimes grading into the (0–)1–3 inner, or the latter linear to vestigial, usually glabrous.. Stamens ± 10, ± free, 8–12 mm. long.. Ovary 2–3 mm. long, densely setose mainly on the margins.. Pod woody, up to 16 × 4.5 cm., usually held conspicuously like a flag above crown of tree, smooth and drying blue-black and ± pruinose when immature, slowly becoming pinkish-brown and finely scurfy throughout when mature; sutural wings spreading, each 4–8 mm. wide.. Fig. 39, p. 183.
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Leaves 6–15 cm long; petioles 10–30 mm long; rachis deeply canaliculate above with raised and winged margins; leaflets glaucous in 3–6 overlapping to widely spaced pairs, broadly oblong or rectangular, 1.5–2 times as long as broad, proximal leaflet pair 2–5 × 1.5–3.5 cm, the rest 3–7 × 2–4 cm, obliquely rounded, obtuse or emarginate at the apex, obliquely cordate at the base, glabrous, midvein central, 3–5 veins from the proximal leaflet base.
Stipules persistent, 10–26 × 1.5–3 mm, shortly connate at the base, erect, linear or falcate; auricles 7–22 × 5–15 mm, reniform to semicircular, palmately nerved, caducous independently of the stipules.
Tree to 15 m tall; bark deeply or shallowly fissured longitudinally, often coarsely reticulate, flaking in thick rectangular scales, dark grey.
Sepals 5, 2–4 × 1–2 mm, oblong, orbicular or oblong-lanceolate, imbricate, densely cilate on the margins.
Flowers up to 3–6 × 3–4 mm; pedicels up to 2.5 mm long; bracteoles 5–8 × 3–4 mm, obovate or orbicular.
Inflorescences in terminal and/or axillary panicles to 10 cm long; bracts 2–3 × 1.5–2 mm, ovate.
Pods dark brown, 9–16 × 3–4.5 cm, oblong to obovate, with suberect ventral flanges.
Ovary 3–5 × 1.5–2.5 mm, densely pubescent, oblong, stipe to 3.5 mm long.
Stamens 10, united to 2 mm at the base filaments 8–12 mm long.
Young branchlets pubescent with brown or cream hairs.
Seeds up to 7, 15–20 × 10–15 mm, oblong or circular.
Petals 0–3, up to 3 × 1.5 mm, filiform or linear.
Dormant axillary buds much flattened.
Life form
Growth form tree
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 12.0 - 15.0
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Deciduous woodland; dry wooded savannah; locally dominant on well drained sites (more rarely on poorly drained sandy soils); typical of hot, dry rocky escarpments around lakes; also on sandy slopes; usually in pure stands; elevations to 1,000 metres.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) -

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings.
Mode seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Conservation status

Brachystegia allenii threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:482186-1
WFO ID wfo-0001057422
COL ID -
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Brachystegia pruinosa Brachystegia schliebenii Brachystegia giorgii Brachystegia allenii