Solanum species of eastern and northern Australia
Habit. Erect, herbaceous resprouter, 0.3–0.6 m high.
Branchlets. Branchlets terete or ridged, white or grey. Branchlet prickles absent or present, 0–30 per decimetre, straight, acicular or straight, broad-based, 0.5–1.5 mm long, 6–10 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae very dense, 0.4–0.5 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 15–18, porrect. Branchlet stellae central ray absent or present, 0–0.5 times as long as laterals, not gland-tipped, thready.
Leaves. Leaves narrow lanceolate or lanceolate, entire or shallowly lobed throughout. Leaf lobes 0 on each side or 3–6 on each side, obtuse, lobing index 1–1.1. Leaves 3–6.5 cm long, 0.8–1.4 cm wide, 3.9–5.2 times longer than broad. Leaf apex acute, base cuneate. Leaf oblique part 0–3 mm long, obliqueness index 0–6 percent. Petioles 0.4–1.3 cm long, 13–25% 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, protostellae absent, hair density dense to very dense. Upper leaf surface stellae 0.05–0.2 mm apart, 0.4–0.5 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 10–15, porrect. Upper leaf surface stellae central ray 0–0.5 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 very dense. Lower leaf surface stellae c. 0.05 mm apart, 0.3–0.6 mm diameter, stalks 0–0.2 mm long. Lower leaf surface stellae lateral rays 13–16, porrect. Lower leaf surface stellae central ray 0.2–0.6 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 6–21 mm long. Inflorescence rachis prickles absent. Inflorescence 4–8-flowered, with all flowers bisexual. Flowers 5-merous. Pedicels at anthesis 7–14 mm long, same thickness throughout, 0.7–0.9 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 3–4.5 mm long. Calyx lobes at anthesis attenuate, 3–6 mm long. Calyx prickles at anthesis absent or present, 0–35 per flower, 1–2.5 mm long. Calyx stellae very dense, white, 0.4–0.5 mm across, stalks 0–0.1 mm long, lateral rays 13–20. Calyx stellae central ray 0.1–1 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve or purple, 12–14 mm long, shallowly lobed or deeply lobed, inner surface glabrous. Anthers 7–9 mm long. Ovary with stellate hairs only. Functional style 11–13 mm long, protruding between anthers, glabrous or with stellate hairs only. Functional style stellae 0.6–0.7 mm across, lateral rays 11–14, central ray 0.4–1 times as long as laterals.
Fruits. Fruiting calyx lobes more than half length of mature fruit, prickles absent or present, prickles 1–2.5 mm long. Mature fruits 2–5 per inflorescence, globular, 13–15 mm diameter, yellow or yellowish-green, with a few scattered stellate hairs. Mature fruits interior moist but not juicy. Pedicels at fruiting stage 16–27 mm long, 1.2–1.5 mm thick at mid-point. Seeds black, 2.9–3.5 mm long.
Distribution and habitat. Queensland, New South Wales, Victoria, Western Australia. Qld: Moreton, Darling Downs, Burnett. NSW: North Coast, North-west Slopes, Central-west Slopes, South-west Slopes, North Western Plains, South Western Plains.
Miscellaneous. Naturalised. Subg. Leptostemonum. Common name: Silver-leaf Nightshade. 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’.