Solanum species of eastern and northern Australia


A. R. Bean

Solanum pugiunculiferum

Habit. Prostrate or sprawling, herbaceous resprouter, 0.2–0.6 m high.

Branchlets. Branchlets grey or yellow or brown. Branchlet prickles 10–200 per decimetre, straight, acicular or straight, broad-based, 2–16 mm long, 6–8 times longer than wide, glabrous. Branchlet hairs Type 2. Branchlet stellae absent. Branchlet Type 2 hairs sparse.

Leaves. Leaves elliptical or ovate, deeply lobed throughout. Leaf lobes 2–3 on each side, acute, lobing index 2.3–10. Leaves 1.6–4.5 cm long, 1.1–2.8 cm wide, 1.4–1.7 times longer than broad. Leaf apex acute, base obtuse or cordate. Leaf oblique part 0.5–11 mm long, obliqueness index 2–24 percent. Petioles 0.5–1 cm long, 20–30% length of lamina, prickles absent or present.

Upper leaf surface. Upper leaf surface green or grey-green. Upper leaf surface prickles present on midvein only or present on midvein and lateral veins, 3–10, straight, broad-based, 1–17 mm long. Upper leaf surface stellate hairs absent, hair density absent from surface. Upper leaf surface simple hairs absent. Upper leaf surface Type 2 hairs present only in vein depressions.

Lower leaf surface. Lower leaf surface green. Lower leaf surface prickles present on midvein only or present on midvein and lateral veins, 2–8, straight, broad-based. Lower leaf surface stellate hair density absent. Lower leaf surface simple hairs absent. Lower leaf surface Type 2 hairs absent.

Inflorescence. Inflorescence supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle 2–4 mm long. Inflorescence rachis prickles present. Inflorescence 2–5-flowered, with all flowers bisexual. Flowers 5-merous. Pedicels at anthesis 3–5 mm long, same thickness throughout, 0.4–0.6 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 1–1.5 mm long. Calyx lobes at anthesis deltate, 0.5–1 mm long. Calyx prickles at anthesis present, 1–4 per flower, 2–6 mm long. Calyx stellae absent. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve, 4–5 mm long, rotate, inner surface glabrous. Anthers 1.5–2.5 mm long. Ovary glabrous. Functional style 2.5–3.5 mm long, protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles 2.5–9 mm long. Mature fruits 1–4 per inflorescence, globular, 8–11 mm diameter, brown or yellow. Mature fruits interior dry. Pedicels at fruiting stage 5–8 mm long, 0.7–1 mm thick at mid-point. Seeds pale yellow, 3–3.8 mm long.

Distribution and habitat. Queensland, Northern Territory, Western Australia. Qld: Cook, Burke. Saline littoral zone.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • flowering plant.

Cite this publication as: ‘Bean, A.R. 2012 onwards. Solanum species of eastern and northern Australia. Version: 29th June 2013.’.