Solanum species of eastern and northern Australia

DELTA Home

A. R. Bean

Solanum pisinnum

Habit. Erect, herbaceous resprouter, 0.2–0.4 m high. Large stems prickles absent.

Branchlets. Branchlets grey or yellow or rusty or brown. Branchlet prickles absent. Branchlet hairs stellate. Branchlet stellae very dense, 0.3–0.5 mm diameter, stalks 0–0.2 mm long. Branchlet stellae lateral rays 7–8, porrect. Branchlet stellae central ray 0.8–1.5 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs absent.

Leaves. Leaves ovate, entire. Leaves 2.8–8.5 cm long, 1.1–4.2 cm wide, 2–2.5 times longer than broad. Leaf apex obtuse or acute, base obtuse or cordate. Leaf oblique part 0–3 mm long, obliqueness index 0–7 percent. Petioles 0.8–2.6 cm long, 18–40% length of lamina, prickles absent.

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 or very dense. Upper leaf surface stellae 0.05–0.2 mm apart, 0.3–0.65 mm across, stalks 0.1–0.25 mm long. Upper leaf surface stellae lateral rays 7–8, porrect. Upper leaf surface stellae central ray 0.4–1.1 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 or yellowish. Lower leaf surface prickles absent. Lower leaf surface stellate hair density dense or very dense. Lower leaf surface stellae 0.05–0.2 mm apart, 0.4–0.7 mm diameter, stalks 0.1–0.3 mm long. Lower leaf surface stellae lateral rays 7–8, porrect. Lower leaf surface stellae central ray 0.4–1.1 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent. Lower leaf surface branched/dendritic hairs absent. Lower leaf surface Type 2 hairs absent.

Inflorescence. Inflorescence supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle 2–15 mm long. Inflorescence rachis prickles absent. Inflorescence 1–3-flowered. Flowers 5-merous. Pedicels at anthesis 4–13 mm long, same thickness throughout, 0.9–1.3 mm thick at mid-point, prickles absent. Calyx tube at anthesis 3.5–4.5 mm long. Calyx lobes at anthesis deltate or rostrate or attenuate, 2–4.5 mm long. Calyx prickles at anthesis absent. Calyx stellae very dense, yellow or brown or rusty, 0.3–0.45 mm across, stalks 0–0.3 mm long, lateral rays 7–8. Calyx stellae central ray 0.6–1.2 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve or purple, 10–13 mm long, shallowly lobed, inner surface densely stellate-hairy. Anthers 4.3–6.2 mm long. Filaments 1.2–1.3 mm long. Ovary glabrous. Functional style 7.5–9 mm long, protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1 per inflorescence, globular, 12–17 mm diameter, yellowish-green, 2-locular. Mature fruits placenta sessile, semi-circular. Mature fruits interior moist but not juicy, pericarp 1.8–2.3 mm thick. Pedicels at fruiting stage 9–22 mm long, 1.1–1.4 mm thick at mid-point. Seeds pale yellow or brown, 3.1–3.4 mm long.

Distribution and habitat. Queensland. Qld: Warrego, Mitchell. Shrubby eucalypt woodland, remote from rainforest, red earths in mulga (Acacia aneura) dominated communities.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • plant (drought affected). • fruits.


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

Contents