Solanum species of eastern and northern Australia

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A. R. Bean

Solanum emmottii

Habit. Erect, rhizomatous perennial shrub, 0.2–0.5 m high.

Branchlets. Branchlets white or grey or yellow. Branchlet prickles 5–280 per decimetre, straight, acicular, 1–5 mm long, 10–14 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae very dense, 0.4–0.8 mm diameter, stalks 0–0.2 mm long. Branchlet stellae lateral rays 7–13, porrect or ascending or multiradiate. Branchlet stellae central ray 0.8–1.3 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs absent.

Leaves. Leaves ovate, entire. Leaves 3.5–8.8 cm long, 1.4–3.8 cm wide, 1.7–2.9 times longer than broad. Leaf apex obtuse or acute, base cuneate or obtuse or cordate. Leaf oblique part 0–4 mm long, obliqueness index 0–7 percent. Petioles 0.6–4.2 cm long, 18–48% length of lamina, prickles absent or present.

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, 0.4–0.7 mm across, stalks 0–0.1 mm long. Upper leaf surface stellae lateral rays 6–10, porrect. Upper leaf surface stellae central ray 0.7–1.2 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 or present on midvein only, 0–2, straight, acicular. 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 0–0.3 mm long. Lower leaf surface stellae lateral rays 7–11, porrect or ascending. Lower leaf surface stellae central ray 0.7–1.2 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 15–50 mm long. Inflorescence rachis prickles absent or present. Inflorescence 2–6-flowered, with all flowers bisexual. Flowers 5-merous. Pedicels at anthesis 4–15 mm long, same thickness throughout, prickles absent or present. Calyx tube at anthesis 2.5–4 mm long. Calyx lobes at anthesis deltate or attenuate, 2–7 mm long. Calyx prickles at anthesis present, 1–25 per flower, 0.5–2 mm long. Calyx stellae very dense, yellow or white, 0.4–0.8 mm across, stalks 0–0.3 mm long, lateral rays 8–10. Calyx stellae central ray 0.7–1.3 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 9–13 mm long, rotate or shallowly lobed, inner surface sparsely stellate-hairy. Anthers 4.2–5.5 mm long. Filaments 1.2–1.6 mm long. Ovary glabrous. Functional style 8–9.5 mm long, strongly bent near base, not touching anthers, glabrous. Stigma expanded, obtuse or lobed.

Fruits. Fruiting calyx lobes less than half length of mature fruit or lobes more than half length of mature fruit, prickles 0.5–2 mm long. Mature fruits 1–3 per inflorescence, globular, 13 mm diameter. Mature fruits pericarp 0.3–0.4 mm thick. Pedicels at fruiting stage 8–13 mm long, 1.2–1.5 mm thick at mid-point. Seeds pale yellow, 2.5–3.3 mm long.

Distribution and habitat. Queensland. Qld: Mitchell, Gregory South, Gregory North. Shrublands in arid zone.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • habit. • fruit. • 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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