Solanum species of eastern and northern Australia
Habit. Prostrate or sprawling, herbaceous resprouter, 0.2–0.4 m high.
Branchlets. Branchlets grey or yellow or brown or green. Branchlet prickles 140–320 per decimetre, straight, acicular, 1–6 mm long, 13–20 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae sparse to moderate to dense, 0.3–0.45 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 5–8, porrect. Branchlet stellae central ray 0.3–0.7 times as long as laterals, not gland-tipped, rigid. Branchlet Type 2 hairs absent.
Leaves. Leaves broadly ovate or orbicular, entire or shallowly lobed throughout. Leaf lobes 0 on each side or 2–3 on each side, obtuse, lobing index 1–1.1. Leaves 6.5–9.5 cm long, 3.4–6 cm wide, 1.1–2.1 times longer than broad. Leaf apex obtuse, base cuneate or obtuse. Leaf oblique part 0–6 mm long, obliqueness index 0–6 percent. Petioles 1.2–1.7 cm long, 13–35% length of lamina, prickles present.
Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles present on midvein and lateral veins, 100–400, straight, acicular, 1–6 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae absent, hair density very sparse to sparse. Upper leaf surface stellae 0.8–2.5 mm apart, 0.25–0.45 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 3–7, porrect. Upper leaf surface stellae central ray 0.8–1.6 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 present on midvein and lateral veins, 40–250, straight, acicular. Lower leaf surface stellate hair density sparse to dense. Lower leaf surface stellae 0.3–1.4 mm apart, 0.5–0.7 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 6–8, porrect. Lower leaf surface stellae central ray 0.5–1 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 17–27 mm long. Inflorescence rachis prickles present. Inflorescence 6–10-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 8–14 mm long, same thickness throughout, 0.5–0.8 mm thick at mid-point, prickles present. Calyx tube at anthesis 2.5–4 mm long. Calyx lobes at anthesis attenuate, 3–6 mm long. Calyx prickles at anthesis present, 36–50 per flower, 1.5–4 mm long. Calyx stellae moderate to dense, transparent, 0.4–0.5 mm across, stalks 0–0.1 mm long, lateral rays 4–8. Calyx stellae central ray 0.8–1.2 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla white or mauve, 13–18 mm long, rotate, inner surface glabrous. Anthers 6.5–8.5 mm long. Ovary with Type 2 hairs only or with stellate and Type 2 hairs. Functional style 11–14 mm long, strongly bent near base, not touching anthers, with Type 2 hairs only or with stellate and Type 2 hairs. Functional style stellae 0.2–0.4 mm across, lateral rays 6–8, central ray 1–2 times as long as laterals.
Fruits. Fruiting calyx lobes less than half length of mature fruit or lobes more than half length of mature fruit, prickles 1.5–4 mm long. Mature fruits 1–6 per inflorescence, globular, 16–21 mm diameter, yellowish-green or green, often streaked, 1-locular (septum absent or incomplete). Mature fruits placenta sessile, elliptical. Mature fruits interior moist but not juicy, pericarp 0.4–0.5 mm thick. Pedicels at fruiting stage 18–28 mm long, 1.4–2 mm thick at mid-point. Seeds pale yellow, 3.3–3.5 mm long.
Distribution and habitat. Queensland. Qld: Cook, Kennedy North. Semi-evergreen vine thicket or brigalow/belah, shrubby eucalypt woodland, remote from rainforest.
Miscellaneous. Subg. Leptostemonum. Data source: specimens.
Illustrations. • plant. • flowers.
Cite this publication as: ‘Bean, A.R. 2012 onwards. Solanum species of eastern and northern Australia. Version: 29th June 2013. http://delta-intkey.com’.