Solanum species of eastern and northern Australia

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A. R. Bean

Solanum elachophyllum

Habit. Sprawling or erect, rhizomatous perennial shrub, 0.1–0.4 m high.

Branchlets. Branchlets white or grey or brown. Branchlet prickles 15–50 per decimetre, straight, acicular, 7–10 mm long, 11–14 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae very dense, 0.15–0.3 mm diameter, stalks 0 mm long. Branchlet stellae lateral rays 10–15, porrect. Branchlet stellae central ray absent or present, 0–0.3 times as long as laterals, not gland-tipped.

Leaves. Leaves elliptical or ovate, entire. Leaves 0.5–1.5 cm long, 0.3–0.7 cm wide, 1.7–2.5 times longer than broad. Leaf apex obtuse, base cuneate. Leaf oblique part 0–0.3 mm long, obliqueness index 0–3 percent. Petioles 0.1–0.3 cm long, 18–35% length of lamina, winged, prickles absent.

Upper leaf surface. Upper leaf surface green or grey-green. Upper leaf surface prickles absent or present on midvein only, 0–2, straight, acicular, 2–7 mm long. Upper leaf surface stellate hairs confined to midrib or distributed throughout, protostellae absent, hair density very sparse to dense. Upper leaf surface stellae 0.3–0.6 mm apart, 0.15–0.25 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 8–10, porrect. Upper leaf surface stellae central ray 0–0.2 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 greenish-white or white, grey or yellowish. Lower leaf surface prickles absent. Lower leaf surface stellate hair density sparse to dense. Lower leaf surface stellae 0.1–0.4 mm apart, 0.15–0.3 mm diameter, stalks 0 mm long. Lower leaf surface stellae lateral rays 8–16, porrect. Lower leaf surface stellae central ray 0–0.1 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent. Lower leaf surface Type 2 hairs absent.

Inflorescence. Inflorescence leaf-opposed, solitary or sessile (rachis very short or absent) or cymose (pseudo-racemose). Inflorescence common peduncle absent or present, 0–1 mm long. Inflorescence rachis prickles absent. Inflorescence 1–2-flowered, with all flowers bisexual. Flowers 5-merous. Pedicels at anthesis 3–15 mm long, same thickness throughout, 0.5–0.8 mm thick at mid-point, prickles absent. Calyx tube at anthesis 2–2.5 mm long. Calyx lobes at anthesis deltate, 1–2.5 mm long. Calyx prickles at anthesis absent. Calyx stellae very sparse to sparse to dense, white, 0.2–0.3 mm across, stalks 0 mm long, lateral rays 8–12. Calyx stellae central ray 0–0.3 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla mauve or purple, 7–10 mm long, deeply lobed, inner surface glabrous. Anthers 4–5 mm long. Ovary with Type 2 hairs only. Functional style 6–6.5 mm long, protruding between anthers, glabrous or with Type 2 hairs only.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles absent. Mature fruits 1 per inflorescence, globular, 12–14 mm diameter, yellowish-green or green, often streaked, 2-locular. Mature fruits placenta sessile, semi-circular. Mature fruits interior moist but not juicy, pericarp 1.2–1.8 mm thick. Pedicels at fruiting stage 6–15 mm long, 0.6–0.9 mm thick at mid-point. Seeds pale yellow or black, 2.9–3.7 mm long.

Distribution and habitat. Queensland. Qld: Leichhardt. Semi-evergreen vine thicket or brigalow/belah.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • fallen fruit. • flowering branches. • 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’.

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