Solanum species of eastern and northern Australia

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A. R. Bean

Solanum kentrocaule

Habit. Erect, rhizomatous perennial shrub, 1–1.5 m high.

Branchlets. Branchlets terete or ridged, white or yellow or brown. Branchlet prickles 200–1000 per decimetre, straight, acicular, 1.5–12 mm long, 9–18 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae dense or very dense, 0.25–0.4 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 8–16, porrect or ascending. Branchlet stellae central ray 0.2–0.6 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs absent.

Leaves. Leaves narrow lanceolate or lanceolate, entire or shallowly lobed throughout. Leaf lobes 3–5 on each side, obtuse, lobing index 1–1.1. Leaves 3.5–12.5 cm long, 0.9–2 cm wide, 3.7–6.5 times longer than broad. Leaf apex acute, base cuneate or obtuse. Leaf oblique part 0–4 mm long, obliqueness index 0–6 percent. Petioles 0.6–2.2 cm long, 14–22% length of lamina, prickles present.

Upper leaf surface. Upper leaf surface green or grey-green. Upper leaf surface prickles present on midvein and lateral veins, 10–60, straight, acicular, 1.5–9 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density sparse or moderate density or dense. Upper leaf surface stellae 0.15–0.4 mm apart, 0.15–0.3 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 8–13, porrect. Upper leaf surface stellae central ray 0.2–0.4 times as long as laterals, not gland-tipped. Upper leaf surface simple hairs absent. Upper leaf surface Type 2 hairs absent.

Lower leaf surface. Lower leaf surface white, grey. Lower leaf surface prickles present on midvein and lateral veins, 40–70, straight, acicular. Lower leaf surface stellate hair density moderate or dense or very dense. Lower leaf surface stellae 0.1–0.3 mm apart, 0.2–0.4 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 8–13, porrect. Lower leaf surface stellae central ray 0.2–0.5 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent. Lower leaf surface Type 2 hairs absent.

Inflorescence. Inflorescence supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle 4–11 mm long. Inflorescence rachis prickles present. Inflorescence 8–17-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 2.5–9 mm long, same thickness throughout, 0.5–0.7 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 2–3.5 mm long. Calyx lobes at anthesis hemispherical or deltate, 1–3 mm long. Calyx prickles at anthesis absent or present, 0–5 per flower, 1–2.5 mm long. Calyx stellae very dense, yellow or white or purple, 0.2–0.25 mm across, stalks 0–0.05 mm long, lateral rays 8–12. Calyx stellae central ray 0.4–0.7 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve or purple, 13–17 mm long, rotate, inner surface glabrous. Anthers 5–7.5 mm long. Filaments 0.8–1.8 mm long. Ovary with Type 2 hairs only. Functional style 7–12 mm long, protruding between anthers, with Type 2 hairs only.

Fruits. Fruiting calyx lobes less than half length of mature fruit or lobes more than half length of mature fruit, prickles absent or present. Mature fruits 1–4 per inflorescence, globular, 13 mm diameter, black, 1-locular (septum absent or incomplete). Mature fruits placenta sessile, linear. Mature fruits interior moist but not juicy, pericarp 0.1–0.3 mm thick. Pedicels at fruiting stage 6–9 mm long. Seeds brown, 2.5–3 mm long.

Distribution and habitat. Western Australia. Shrublands in arid zone.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.


Cite this publication as: ‘Bean, A.R. 2012 onwards. Solanum species of eastern and northern Australia. Version: 29th June 2013. http://delta-intkey.com’.

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