Solanum species of eastern and northern Australia

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A. R. Bean

Solanum stenopterum

Habit. Sprawling or erect, herbaceous resprouter, 0.2–0.4 m high.

Branchlets. Branchlets green. Branchlet prickles 7–15 per decimetre, straight, acicular, 2–8 mm long, 10–15 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae sparse to moderate, 0.4–1.2 mm diameter, stalks 0 mm long. Branchlet stellae lateral rays 4–8, porrect. Branchlet stellae central ray 0.7–1.4 times as long as laterals, not gland-tipped. Branchlet simple hairs erect, straight.

Leaves. Leaves linear or narrow lanceolate or lanceolate or ovate, entire or shallowly lobed throughout or deeply lobed throughout. Leaf lobes 0 on each side or 2–3 on each side, acute or obtuse, lobing index 1–5. Leaves 4–7 cm long, 0.5–2.6 cm wide, 2.2–12 times longer than broad. Leaf apex acute, base cuneate. Leaf oblique part 0–3 mm long, obliqueness index 0–5 percent. Petioles 0.5–1.3 cm long, 10–18% length of lamina, winged, prickles absent.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles present on midvein only or present on midvein and lateral veins, 3–15, straight, acicular, 1–4 mm long. Upper leaf surface stellate hairs confined to midrib or distributed throughout, hair density very sparse to sparse. Upper leaf surface stellae 0.8–2.5 mm apart, 0.3–1.1 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 3–5, porrect. Upper leaf surface stellae central ray 1–3 times as long as laterals, not gland-tipped. Upper leaf surface simple hairs absent or erect, straight, sparse, not gland-tipped, 0.6–1.2 mm long. Upper leaf surface Type 2 hairs absent.

Lower leaf surface. Lower leaf surface green. Lower leaf surface prickles present on midvein only or present on midvein and lateral veins, 1–15, straight, acicular. Lower leaf surface stellate hair density very sparse to moderate. Lower leaf surface stellae 0.8–3 mm apart, 0.5–1 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 4–7, porrect. Lower leaf surface stellae central ray 1–2 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 sessile (rachis very short or absent). Inflorescence common peduncle absent. Inflorescence 1–2-flowered, with one bisexual flower, the rest male or some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 21–38 mm long, same thickness throughout, 0.5–0.7 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 2–3 mm long. Calyx lobes at anthesis deltate, 1.5–2.5 mm long. Calyx prickles at anthesis present, 5–40 per flower, 1–4 mm long. Calyx stellae very sparse to sparse to dense, transparent, 0.3–0.6 mm across, stalks 0 mm long, lateral rays 2–6. Calyx stellae central ray 1–3 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 14–18 mm long, shallowly lobed, inner surface glabrous. Anthers 3.5–5 mm long. Ovary with Type 2 hairs only. Functional style 7.5–8.5 mm long, protruding between anthers, glabrous or with Type 2 hairs only.

Fruits. Fruiting calyx lobes more than half length of mature fruit, prickles 2–4 mm long. Mature fruits 1 per inflorescence, globular, 10 mm diameter. Pedicels at fruiting stage 21–38 mm long, 1.5 mm thick at mid-point.

Distribution and habitat. Queensland, New South Wales. Qld: Darling Downs, Burnett. NSW: North-west Slopes. Semi-evergreen vine thicket or brigalow/belah, grassland or open woodland on cracking clays.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • leaves and flower. • plant. • flower.


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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