Solanum species of eastern and northern Australia

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A. R. Bean

Solanum amblymerum

Habit. Erect, rhizomatous perennial shrub, 0.8–1.8 m high.

Branchlets. Branchlets grey or brown. Branchlet prickles 1–10 per decimetre, straight, acicular, 5–9 mm long, 7–10 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae very dense, 0.3–0.4 mm diameter, stalks 0 mm long. Branchlet stellae lateral rays 7–10, porrect. Branchlet stellae central ray absent or present, 0–0.5 times as long as laterals, not gland-tipped.

Leaves. Leaves linear or narrow lanceolate, entire or with basal lobes only. Leaf lobes 0–1 on each side, obtuse. Leaves 5–11 cm long, 0.5–1.3 cm wide, 6–13 times longer than broad. Leaf apex obtuse or acute, base cuneate or obtuse or hastate. Leaf oblique part 0–1.5 mm long, obliqueness index 0–2 percent. Petioles 0.3–0.9 cm long, 5–15% length of lamina, prickles absent or present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles present on midvein only, 1–7, straight, acicular, 4–10 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density very sparse to sparse. Upper leaf surface stellae 0.4–0.7 mm apart, 0.1–0.2 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 7–8, porrect. Upper leaf surface stellae central ray 0–0.5 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 absent or present on midvein only, 0–5, straight, acicular. Lower leaf surface stellate hair density very dense. Lower leaf surface stellae c. 0.05 mm apart, 0.2–0.45 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 7–8, porrect. Lower leaf surface stellae central ray 0.5–1 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 1–11 mm long. Inflorescence rachis prickles absent. Inflorescence 3–6-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 5–10 mm long, same thickness throughout, 0.8–0.9 mm thick at mid-point, prickles absent. Calyx tube at anthesis 1.5–2.5 mm long. Calyx lobes at anthesis deltate or attenuate, 2.5–4.5 mm long. Calyx prickles at anthesis absent. Calyx stellae dense, transparent or purple, 0.25–0.4 mm across, stalks 0–0.1 mm long, lateral rays 7–8. Calyx stellae central ray 0.5–1 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 8–14 mm long, rotate, inner surface glabrous or sparsely stellate-hairy. Anthers 4.5–6.5 mm long. Ovary with Type 2 hairs only. Functional style 8–11 mm long, protruding between anthers, with stellate and Type 2 hairs. Functional style stellae 0.4–0.5 mm across, lateral rays 8–11, central ray c. 1 times as long as laterals.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1–3 per inflorescence, oblate or globular, 11–16 mm diameter, yellowish-green or green, often streaked, 2-locular. Mature fruits placenta stalked, anvil-shaped. Mature fruits interior moist but not juicy, pericarp 0.7–0.8 mm thick. Pedicels at fruiting stage 9–13 mm long, 0.9–1.4 mm thick at mid-point. Seeds white or pale yellow, 2.3–3 mm long.

Distribution and habitat. Queensland, New South Wales. Qld: Moreton, Darling Downs. NSW: Northern Tablelands, North-west Slopes. Shrubby eucalypt woodland, remote from rainforest.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • amblymer1.jpg. • amblymer.jpg.


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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