Solanum species of eastern and northern Australia

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A. R. Bean

Solanum angustum

Habit. Sprawling or erect, herbaceous resprouter, 0.3 m high.

Branchlets. Branchlets grey or yellow. Branchlet prickles 5–30 per decimetre, straight, acicular, 3–6 mm long, 10–15 times longer than wide, glabrous or with scattered stellate hairs on lower half. Branchlet hairs stellate. Branchlet stellae very dense, 0.3–0.5 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 6–8, porrect. Branchlet stellae central ray present, 0.5–1 times as long as laterals, not gland-tipped, rigid.

Leaves. Leaves narrow lanceolate or lanceolate or elliptical or ovate, entire or shallowly lobed throughout. Leaf lobes 0 on each side or 2–3 on each side, obtuse, lobing index 1–1.8. Leaves 1.5–5 cm long, 0.4–1.8 cm wide, 2.4–7 times longer than broad. Leaf apex obtuse, base cuneate. Leaf oblique part 0–5 mm long, obliqueness index 0–9 percent. Petioles 0.3–2.2 cm long, 17–55% length of lamina, prickles absent or present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles absent or present on midvein only, 0–4, straight, acicular, 3–6 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae absent, hair density very sparse to sparse. Upper leaf surface stellae 0.3–0.9 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 0.5–1 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 or yellowish. Lower leaf surface prickles absent. Lower leaf surface stellate hair density sparse to dense. Lower leaf surface stellae 0.1–0.7 mm apart, 0.3–0.6 mm diameter, stalks 0–0.1 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 leaf-opposed, solitary or cymose (pseudo-racemose). Inflorescence common peduncle absent or present, 0–15 mm long. Inflorescence rachis prickles absent or present. Inflorescence 1–4-flowered, with one bisexual flower, the rest male or some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 7–19 mm long, markedly thicker distally, 0.7–1 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 2–3 mm long. Calyx lobes at anthesis deltate, 2–3.5 mm long. Calyx prickles at anthesis absent or present, 0–10 per flower, 0.5–4 mm long. Calyx stellae dense, transparent, 0.3–0.4 mm across, stalks 0 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, 10–17 mm long, rotate, inner surface glabrous. Anthers 4.6–5.5 mm long. Ovary with Type 2 hairs only. Functional style 9–10 mm long, protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes less than half length of mature fruit or lobes more than half length of mature fruit, prickles absent or present, prickles 0.5–4 mm long. Mature fruits 1 per inflorescence, globular, 16–20 mm diameter, 2-locular. Mature fruits placenta sessile, semi-circular. Mature fruits interior juicy, succulent or moist but not juicy, pericarp 0.4–0.5 mm thick. Pedicels at fruiting stage 15–27 mm long, 0.9–1.2 mm thick at mid-point. Seeds pale yellow, 2.5–3.7 mm long.

Distribution and habitat. Queensland. Qld: Cook, Kennedy North. Shrubby eucalypt woodland, remote from rainforest.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • fruits. • flowers and leaves. • flowering plant.


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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