Solanum species of eastern and northern Australia

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A. R. Bean

Solanum pycnotrichum

Habit. Erect, rhizomatous perennial shrub, 1.1–1.8 m high.

Branchlets. Branchlets white or yellow. Branchlet prickles 10–32 per decimetre, straight, acicular or straight, broad-based, 2–10 mm long, 7–14 times longer than wide, glabrous or with scattered stellate hairs on lower half. Branchlet hairs stellate. Branchlet stellae very dense, 0.5–0.7 mm diameter, stalks 0–0.4 mm long. Branchlet stellae lateral rays 8, ascending. Branchlet stellae central ray 1–2.2 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs absent.

Leaves. Leaves lanceolate or ovate, entire or shallowly lobed throughout. Leaf lobes 0–6 on each side, obtuse, lobing index 1–1.1. Leaves 4.8–9 cm long, 1.6–3.4 cm wide, 2.6–4.5 times longer than broad. Leaf apex obtuse or acute, base cuneate or obtuse. Leaf oblique part 0–2 mm long, obliqueness index 0–3 percent. Petioles 0.5–0.9 cm long, 7–18% length of lamina, prickles absent.

Upper leaf surface. Upper leaf surface grey-green or grey. Upper leaf surface prickles absent. Upper leaf surface stellate hairs distributed throughout, hair density dense or very dense. Upper leaf surface stellae 0.05–0.2 mm apart, 0.35–0.6 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 6–8, porrect. Upper leaf surface stellae central ray 1–2.5 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. Lower leaf surface prickles absent. Lower leaf surface stellate hair density dense or very dense. Lower leaf surface stellae 0.05–0.1 mm apart, 0.4–0.6 mm diameter, stalks 0–0.2 mm long. Lower leaf surface stellae lateral rays 6–8, 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 supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle 5–18 mm long. Inflorescence rachis prickles absent or present. Inflorescence 8–29-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 5–6 mm long, same thickness throughout, prickles absent. Calyx tube at anthesis 2–3 mm long. Calyx lobes at anthesis hemispherical or deltate, 1.5–2.5 mm long. Calyx prickles at anthesis absent. Calyx stellae dense or very dense, yellow or white, 0.3–0.5 mm across, stalks 0–0.1 mm long, lateral rays 8. Calyx stellae central ray 1.2–2 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 13 mm long, rotate, inner surface glabrous or with simple hairs. Anthers 7–7.3 mm long. Filaments 1.7 mm long. Ovary glabrous or with Type 2 hairs only. Functional style 10–11 mm long, protruding between anthers, with Type 2 hairs only.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 2–4 per inflorescence, globular, 15 mm diameter, black, 1-locular (septum absent or incomplete). Mature fruits pericarp 0.1–0.3 mm thick. Pedicels at fruiting stage 9–12 mm long. Seeds brown or black, 3.2–3.4 mm long.

Distribution and habitat. Western Australia.

Miscellaneous. Subg. Leptostemonum. 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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