Solanum species of eastern and northern Australia

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A. R. Bean

Solanum sporadotrichum

Habit. Erect, rhizomatous perennial shrub, 1.5–4 m high. Large stems bark furrowed, corky throughout.

Branchlets. Branchlets yellow or rusty or brown. Branchlet prickles absent or present, 0–3 per decimetre, straight, acicular, 4–7 mm long, 10–12 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae sparse to moderate, 0.3–0.6 mm diameter, stalks 0 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.

Leaves. Leaves elliptical or ovate, shallowly lobed throughout. Leaf lobes 3–4 on each side, obtuse, lobing index 1.1–1.4. Leaves 6.5–11 cm long, 3.5–5.5 cm wide, 1.6–2.1 times longer than broad. Leaf apex obtuse or acute, base obtuse. Leaf oblique part 0–6 mm long, obliqueness index 0–8 percent. Petioles 1–2.2 cm long, 13–25% length of lamina, prickles absent.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles absent or present on midvein only or present on midvein and lateral veins, 0–30, straight, acicular, 1–6 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density very sparse or sparse. Upper leaf surface stellae 0.9–1.6 mm apart, 0.4–0.5 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 4–8, porrect. Upper leaf surface stellae central ray 0.5–1 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 green. Lower leaf surface prickles absent or present on midvein only or present on midvein and lateral veins, 0–15, straight, acicular. Lower leaf surface stellate hair density moderate to dense. Lower leaf surface stellae 0.4–0.8 mm apart, 0.5–0.9 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 6–8, porrect. Lower leaf surface stellae central ray 0.3–0.7 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 11–16 mm long. Inflorescence rachis prickles absent. Inflorescence 3–7-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 5–10 mm long, same thickness throughout, 0.5–0.8 mm thick at mid-point, prickles absent. Calyx tube at anthesis 2–3 mm long. Calyx lobes at anthesis deltate or attenuate, 2.5–7.5 mm long. Calyx prickles at anthesis absent. Calyx stellae moderate to dense, transparent, 0.3–0.5 mm across, stalks 0 mm long, lateral rays 5–7. Calyx stellae central ray 0.7–1.5 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 7–12 mm long, shallowly lobed or deeply lobed, inner surface glabrous. Anthers 4.5–7.5 mm long. Ovary glabrous. Functional style 10–11.5 mm long, protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes less than half length of mature fruit or lobes more than half length of mature fruit, prickles absent. Mature fruits 1–2 per inflorescence, globular, 13 mm diameter, yellowish-green or green, often streaked, 1-locular (septum absent or incomplete). Mature fruits placenta sessile, semi-circular. Mature fruits interior moist but not juicy, pericarp 2.3–2.5 mm thick. Pedicels at fruiting stage 6–13 mm long, 0.5–0.8 mm thick at mid-point. Seeds pale yellow, 2.9 mm long.

Distribution and habitat. Queensland. Qld: Kennedy South, Kennedy North. Evergreen notophyll rainforest (no eucalypts), wet eucalypt forest with rainforest understorey, or rainforest margins, semi-evergreen vine thicket or brigalow/belah.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • flowers and leaves.


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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