Solanum species of eastern and northern Australia

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A. R. Bean

Solanum ammophilum

Habit. Erect, herbaceous resprouter, 0.2–0.4 m high.

Branchlets. Branchlets white or grey or yellow. Branchlet prickles absent or present, 0–10 per decimetre, straight, broad-based, 1.5–5 mm long, 5–7 times longer than wide, with scattered stellate hairs on lower half. Branchlet hairs Type 2 or stellate. Branchlet stellae dense to very dense, 0.3–0.5 mm diameter, stalks 0 mm long. Branchlet stellae lateral rays 8–13, porrect. Branchlet stellae central ray absent or present, 0–0.3 times as long as laterals, not gland-tipped. Branchlet Type 2 hairs dense.

Leaves. Leaves linear or narrow lanceolate, entire. Leaves 2–7 cm long, 0.3–0.7 cm wide, 6–10 times longer than broad. Leaf apex obtuse, base cuneate. Leaf oblique part 0–1 mm long, obliqueness index 0–3 percent. Petioles 0.3–0.8 cm long, 10–17% length of lamina, prickles absent.

Upper leaf surface. Upper leaf surface grey-green. Upper leaf surface prickles absent. Upper leaf surface stellate hairs distributed throughout, protostellae absent, hair density moderate density to dense. Upper leaf surface stellae 0.1–0.2 mm apart, 0.2–0.5 mm across, stalks 0–0.05 mm long. Upper leaf surface stellae lateral rays 8–10, porrect. Upper leaf surface stellae central ray 0–0.3 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 white, grey. Lower leaf surface prickles absent. Lower leaf surface stellate hair density dense to very dense. Lower leaf surface stellae 0.05–0.1 mm apart, 0.4–0.8 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 8–10, porrect. Lower leaf surface stellae central ray 0–0.3 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent. Lower leaf surface Type 2 hairs present throughout, 0.05–0.1 mm apart.

Inflorescence. Inflorescence leaf-opposed or supra-axillary, solitary or sessile (rachis very short or absent). Inflorescence common peduncle absent. Inflorescence 1–2-flowered, with all flowers bisexual. Flowers 4-merous. Pedicels at anthesis 5–17 mm long, same thickness throughout, 0.8–1.1 mm thick at mid-point, prickles absent. Calyx tube at anthesis 2.5–4 mm long. Calyx lobes at anthesis deltate, 2.5–6 mm long. Calyx prickles at anthesis absent. Calyx stellae very dense, white, 0.4–0.6 mm across, stalks 0–0.1 mm long, lateral rays 8–11. Calyx stellae central ray 0.2–0.8 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 7–15 mm long, deeply lobed, inner surface sparsely stellate-hairy. Anthers 4.5–7.5 mm long. Ovary with Type 2 hairs only or with white glandular papillae. Functional style 8–11.5 mm long, protruding between anthers, with Type 2 hairs only or with white glandular papillae.

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, oblate or globular, c. 13 mm diameter, yellowish-green or green, often streaked, 2-locular. Mature fruits placenta sessile, elliptical. Mature fruits interior moist but not juicy, pericarp 0.7–0.9 mm thick. Pedicels at fruiting stage 9–18 mm long, 0.8–1.1 mm thick at mid-point. Seeds pale yellow, 2.7–3.1 mm long.

Distribution and habitat. Queensland, New South Wales. Qld: Maranoa, Warrego. NSW: North Western Plains. Shrublands in arid zone.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • plant. • type specimen.


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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