Solanum species of eastern and northern Australia

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A. R. Bean

Solanum dysprosium

Habit. Erect, rhizomatous perennial shrub, 0.5–1 m high.

Branchlets. Branchlets mauve to purple or brown. Branchlet prickles 25–50 per decimetre, straight, acicular, 3–8 mm long, 9–12 times longer than wide, glabrous. Branchlet hairs Type 2 or stellate. Branchlet stellae sparse to moderate, 0.25–0.5 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 4–8, porrect. Branchlet stellae central ray absent or present, 0–4 times as long as laterals, not gland-tipped, rigid. Branchlet Type 2 hairs sparse.

Leaves. Leaves ovate, shallowly lobed throughout. Leaf lobes 4–5 on each side, acute, lobing index 1.3–1.6. Leaves 7–10.5 cm long, 3.5–5 cm wide, 1.9–2.2 times longer than broad. Leaf apex acute or acuminate, base obtuse. Leaf oblique part 0–5 mm long, obliqueness index 0–6 percent. Petioles 1.3–3.5 cm long, 20–35% length of lamina, prickles present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles present on midvein and lateral veins, 30–50, straight, acicular, 2–8 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density sparse. Upper leaf surface stellae 0.5–0.8 mm apart, 0.25–0.5 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 4–5, porrect. Upper leaf surface stellae central ray 0.5–3 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 green. Lower leaf surface prickles present on midvein and lateral veins, 11–17, straight, acicular. Lower leaf surface stellate hair density moderate. Lower leaf surface stellae 0.4–0.8 mm apart, 0.5–0.8 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 4–6, porrect. Lower leaf surface stellae central ray 0–1 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 17–35 mm long. Inflorescence rachis prickles present. Inflorescence 12–15-flowered. Flowers 5-merous. Pedicels at anthesis 8–11 mm long, same thickness throughout, 0.3–0.6 mm thick at mid-point, prickles absent. Calyx tube at anthesis 2–2.5 mm long. Calyx lobes at anthesis attenuate, 2–3.5 mm long. Calyx prickles at anthesis absent. Calyx stellae very sparse to sparse, transparent, 0.15–0.2 mm across, stalks 0 mm long, lateral rays 4–5. Calyx stellae central ray 1–2 times as long as laterals, not gland-tipped. Calyx simple hairs present, Type 2 hairs absent. Corolla purple, 10–14 mm long, shallowly lobed or deeply lobed. Anthers 5–5.8 mm long. Functional style protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1 per inflorescence, globular, 7 mm diameter. Pedicels at fruiting stage 15 mm long, 0.7 mm thick at mid-point. Seeds pale yellow, 2.5–3 mm long.

Distribution and habitat. Queensland. Qld: Cook. Semi-deciduous vine forest on sand, laterite or granite.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • type specimen.


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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