Solanum species of eastern and northern Australia

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A. R. Bean

Solanum octonum

Habit. Erect, rhizomatous perennial shrub, 0.8–1.5 m high.

Branchlets. Branchlets white or grey. Branchlet prickles 10–56 per decimetre, straight, acicular or straight, broad-based, 4–7 mm long, 5–12 times longer than wide, 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 8–15, porrect or ascending. Branchlet stellae central ray present, 0.2–0.8 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs absent.

Leaves. Leaves lanceolate, entire. Leaves 5.9–8 cm long, 0.8–1.7 cm wide, 3.9–8 times longer than broad. Leaf apex obtuse, base cuneate. Leaf oblique part 0–7 mm long, obliqueness index 0–10 percent. Petioles 0.5–1.6 cm long, 8–25% length of lamina, prickles absent or present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles absent or present on midvein only, 0–3. Upper leaf surface stellate hairs distributed throughout, hair density very sparse. Upper leaf surface stellae 0.4–0.6 mm apart, 0.2–0.4 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 6–12, porrect. Upper leaf surface stellae central ray 0.1–0.8 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. Lower leaf surface prickles absent or present on midvein only, 0–1. Lower leaf surface stellate hair density sparse or moderate or dense. Lower leaf surface stellae 0.15–0.4 mm apart, 0.25–0.5 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 7–11, porrect. Lower leaf surface stellae central ray 0.1–0.5 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 1–10 mm long. Inflorescence rachis prickles absent or present. Inflorescence 6–13-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 6–9 mm long, same thickness throughout, prickles absent. Calyx tube at anthesis 2.5–3 mm long. Calyx lobes at anthesis hemispherical or deltate, 2–3 mm long. Calyx prickles at anthesis absent. Calyx stellae dense or very dense, yellow or white, 0.25–0.35 mm across, stalks 0–0.1 mm long, lateral rays 6–13. 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, 12–15 mm long, rotate, inner surface glabrous or with simple hairs. Anthers 5.2–6.5 mm long. Filaments 1.3–1.6 mm long. Ovary with Type 2 hairs only. Functional style 8–9.5 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 1–4 per inflorescence, globular, black, 1-locular (septum absent or incomplete). Mature fruits pericarp 0.1–0.3 mm thick. Pedicels at fruiting stage 8 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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