Solanum species of eastern and northern Australia

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A. R. Bean

Solanum hamulosum

Habit. Erect, perennial vine, 1.5–7 m high.

Branchlets. Branchlets grey or yellow or rusty or brown. Branchlet prickles 50–140 per decimetre, curved, broad-based, 1–3.5 mm long, 1–2.5 times longer than wide, with scattered stellate hairs on lower half. Branchlet hairs stellate. Branchlet stellae very dense, 0.3–0.4 mm diameter, stalks 0–0.4 mm long. Branchlet stellae lateral rays 7–10, porrect or ascending. Branchlet stellae central ray 0.5–1 times as long as laterals, not gland-tipped, thready.

Leaves. Leaves elliptical or ovate, entire. Leaves 11–15 cm long, 5–6.5 cm wide, 1.7–2.4 times longer than broad. Leaf apex acute or acuminate, base cuneate or obtuse or cordate. Leaf oblique part 0–6 mm long, obliqueness index 0–6 percent. Petioles 1.9–3.8 cm long, 17–25% length of lamina, prickles present.

Upper leaf surface. Upper leaf surface green or grey-green. Upper leaf surface prickles absent or present on midvein only or present on midvein and lateral veins, 0–10, straight, broad-based, 2.5–7 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density moderate density to dense. Upper leaf surface stellae 0.2–0.3 mm apart, 0.25–0.4 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 6–8, porrect. Upper leaf surface stellae central ray 0.7–1.2 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 or yellowish. Lower leaf surface prickles present on midvein only, 1–6, curved, broad-based. Lower leaf surface stellate hair density dense. Lower leaf surface stellae 0.1–0.15 mm apart, 0.4–0.5 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 8–9, porrect. Lower leaf surface stellae central ray 0.7–1.5 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 absent or present, 0–5 mm long. Inflorescence rachis prickles absent or present. Inflorescence 5–11-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 8–18 mm long, markedly thicker distally, 0.5–0.6 mm thick at mid-point, prickles absent. Calyx tube at anthesis 2–3.5 mm long. Calyx lobes at anthesis deltate, 2–3.5 mm long. Calyx prickles at anthesis absent. Calyx stellae dense to very dense, white or brown or rusty, 0.25–0.5 mm across, stalks 0–0.2 mm long, lateral rays 7–8. Calyx stellae central ray 0.7–1.2 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve, 9–15 mm long, shallowly lobed or deeply lobed, inner surface sparsely stellate-hairy. Anthers 4.5–6 mm long. Ovary with stellate hairs only. Functional style 8–8.5 mm long, protruding between anthers, with stellate hairs only. Functional style stellae 0.3–0.5 mm across, lateral rays 6–8, central ray 0.7–1.2 times as long as laterals.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1–2 per inflorescence, globular, 13–15 mm diameter, yellowish-green or green, often streaked, 2-locular. Mature fruits placenta sessile, semi-circular or stalked, anvil-shaped. Mature fruits interior moist but not juicy, pericarp 0.8–1 mm thick. Pedicels at fruiting stage 18–25 mm long, 0.8–1.2 mm thick at mid-point. Seeds pale yellow, 2–2.5 mm long.

Distribution and habitat. Queensland. Qld: Cook, Kennedy North. Evergreen notophyll rainforest (no eucalypts).

Miscellaneous. Subg. Leptostemonum. Common name: Dirran Curse. 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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