Solanum species of eastern and northern Australia

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A. R. Bean

Solanum rostratum

Habit. Sprawling or erect, herbaceous resprouter or rhizomatous perennial shrub, 0.3–0.6 m high.

Branchlets. Branchlets brown or green. Branchlet prickles 180–240 per decimetre, straight, acicular or straight, broad-based, 1–7 mm long, 6–9 times longer than wide, glabrous. Branchlet hairs stellate. Branchlet stellae sparse to moderate to dense, 0.3–1.3 mm diameter, stalks 0–0.1 mm long. Branchlet stellae lateral rays 4–7, porrect or ascending. Branchlet stellae central ray 0.8–1.5 times as long as laterals, not gland-tipped, rigid. Branchlet Type 2 hairs absent.

Leaves. Leaves elliptical or ovate or broadly ovate, deeply lobed throughout. Leaf lobes 3–4 on each side, obtuse, lobing index 9–50. Leaves 4–8 cm long, 2.1–4.2 cm wide, 1.5–1.9 times longer than broad. Leaf apex obtuse, base cuneate or obtuse or cordate. Leaf oblique part 0–3 mm long, obliqueness index 0–4 percent. Petioles 1.3–2.9 cm long, 35–50% length of lamina, not winged or winged, prickles present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles present on midvein and lateral veins, 9–35, straight, broad-based, 2–7 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density sparse or moderate density. Upper leaf surface stellae 0.3–0.8 mm apart, 0.6–0.9 mm across, stalks 0 mm long. Upper leaf surface stellae lateral rays 4–6, porrect. Upper leaf surface stellae central ray 1–1.7 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 0.1–0.2 mm apart.

Lower leaf surface. Lower leaf surface green. Lower leaf surface prickles present on midvein and lateral veins, 10–20, straight, broad-based. Lower leaf surface stellate hair density moderate to dense. Lower leaf surface stellae 0.2–0.5 mm apart, 0.8–1.1 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 4–8, porrect. Lower leaf surface stellae central ray 1–1.7 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent. Lower leaf surface Type 2 hairs present throughout, 0.2–0.4 mm apart.

Inflorescence. Inflorescence supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle 5–20 mm long. Inflorescence rachis prickles present. Inflorescence 5–10-flowered, with some bisexual and some male flowers. Flowers 5-merous. Pedicels at anthesis 3–6 mm long, markedly thicker distally, 0.5–0.7 mm thick at mid-point, prickles present. Calyx tube at anthesis 2.5–3.5 mm long. Calyx lobes at anthesis deltate or attenuate, 4–5.5 mm long. Calyx prickles at anthesis present, 100–250 per flower, 1–9 mm long. Calyx stellae dense, transparent, 0.6–1.3 mm across, stalks 0–0.3 mm long, lateral rays 4–8. Calyx stellae central ray 0.8–1.5 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs present. Corolla yellow, 9–15 mm long, rotate, inner surface glabrous. Anthers 3.5–7.5 mm long. Ovary glabrous. Functional style c. 13 mm long, strongly bent near base, not touching anthers, glabrous.

Fruits. Fruiting calyx hypanthium accrescent, enclosing most or all of mature fruit, prickles 1–11 mm long. Mature fruits 4–8 per inflorescence, globular, 9–12 mm diameter, 2-locular. Mature fruits interior dry. Pedicels at fruiting stage 6–10 mm long, 1–1.2 mm thick at mid-point. Seeds black, 2–2.7 mm long.

Distribution and habitat. Queensland, New South Wales, Victoria, Western Australia. Qld: Moreton, Darling Downs, Burnett. NSW: North Coast, Northern Tablelands, Southern Tablelands, North-west Slopes, Central-west Slopes, South-west Slopes, South Western Plains. Shrubby eucalypt woodland, remote from rainforest.

Miscellaneous. Naturalised. Subg. Leptostemonum. Common name: Buffalo Burr. Data source: specimens.

Illustrations. • line drawing.


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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