Solanum species of eastern and northern Australia

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A. R. Bean

Solanum parvifolium ssp. tropicum

Habit. Erect, rhizomatous perennial shrub, 0.6–1.5 m high.

Branchlets. Branchlets grey or brown or green. Branchlet prickles 1–20 per decimetre, straight, acicular, 4–7 mm long, 8–18 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae sparse to moderate to dense, 0.3–0.6 mm diameter, stalks 0–0.2 mm long. Branchlet stellae lateral rays 6–8, porrect. Branchlet stellae central ray 0.1–0.8 times as long as laterals, not gland-tipped, rigid. Branchlet Type 2 hairs absent.

Leaves. Leaves linear or narrow lanceolate, entire. Leaves 7.5–13.5 cm long, 1.3–3.5 cm wide, 3.3–7 times longer than broad. Leaf apex acute, base cuneate or obtuse. Leaf oblique part 0–2 mm long, obliqueness index 0–3 percent. Petioles 0.7–1.3 cm long, 7–13% length of lamina, prickles absent.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles absent. Upper leaf surface stellate hairs distributed throughout, protostellae absent, hair density absent from surface or very sparse to sparse. Upper leaf surface stellae 0.3–3 mm apart, 0.3–0.5 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 6–8, porrect. Upper leaf surface stellae central ray 0.7–1.5 times as long as laterals, not gland-tipped. Upper leaf surface simple hairs absent. Upper leaf surface Type 2 hairs present throughout. Upper leaf surface Type 2 hairs 0.1–1.5 mm apart.

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, 0.4–0.6 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 7–8, porrect. Lower leaf surface stellae central ray 0.3–1 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 absent or present, 0–6 mm long. Inflorescence rachis prickles absent. Inflorescence 2–6-flowered, with one bisexual flower, the rest male or some bisexual and some male flowers. Flowers 4–5-merous. Pedicels at anthesis 14–24 mm long, markedly thicker distally, 0.4–0.8 mm thick at mid-point, prickles absent. Calyx tube at anthesis 1.5–3 mm long. Calyx lobes at anthesis attenuate, 2–3.5 mm long. Calyx prickles at anthesis absent. Calyx stellae dense to very dense, yellow or brown or rusty, 0.3–0.5 mm across, stalks 0 mm long, lateral rays 7–8. Calyx stellae central ray 0.5–1.5 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve or purple, 9–15 mm long, rotate or shallowly lobed, inner surface glabrous. Anthers 4.5–6.5 mm long. Ovary glabrous or with stellate and Type 2 hairs. Functional style 7–9 mm long, protruding between anthers, glabrous or with Type 2 hairs only or with stellate and Type 2 hairs. Functional style stellae c. 0.4 mm across, central ray c. 0.5 times as long as laterals.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1 per inflorescence, globular, 5–7 mm diameter, red, 1-locular (septum absent or incomplete). Mature fruits placenta not apparent. Mature fruits interior juicy, succulent, pericarp 0.3 mm thick. Pedicels at fruiting stage 26–33 mm long, 0.5–1 mm thick at mid-point. Seeds pale yellow, 2–2.4 mm long.

Distribution and habitat. Queensland. Qld: Cook, Kennedy North. Wet eucalypt forest with rainforest understorey, or rainforest margins, semi-evergreen vine thicket or brigalow/belah.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • holotype.


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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