Solanum species of eastern and northern Australia

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A. R. Bean

Solanum eremophilum

Habit. Prostrate or sprawling, herbaceous resprouter, 0.15–0.3 m high.

Branchlets. Branchlets grey or brown. Branchlet prickles 5–30 per decimetre, straight, acicular, 2–8 mm long, 9–12 times longer than wide, glabrous or with scattered Type 2 hairs on lower half. Branchlet hairs Type 2 or simple or stellate. Branchlet stellae sparse to moderate or dense, 0.4–0.6 mm diameter, stalks 0–0.2 mm long. Branchlet stellae lateral rays 5–8, porrect. Branchlet stellae central ray 2–4 times as long as laterals, not gland-tipped, rigid. Branchlet simple hairs erect, straight, not gland-tipped, 0.3–0.5 mm long. Branchlet Type 2 hairs dense.

Leaves. Leaves elliptical or broadly ovate, shallowly lobed throughout. Leaf lobes 2–4 on each side, obtuse, lobing index 1.1–1.8. Leaves 3.2–5 cm long, 2.2–3.5 cm wide, 1.3–1.9 times longer than broad. Leaf apex obtuse, base obtuse or cordate. Leaf oblique part 0–3 mm long, obliqueness index 0–7 percent. Petioles 1.6–4.2 cm long, 40–100% length of lamina, prickles present.

Upper leaf surface. Upper leaf surface grey-green. Upper leaf surface prickles present on midvein and lateral veins, 12–25, straight, acicular, 3–12 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, 0.3–0.8 mm across, stalks 0–0.25 mm long. Upper leaf surface stellae lateral rays 4–9, porrect or ascending or multiradiate. Upper leaf surface stellae central ray 1.5–4 times as long as laterals, not gland-tipped. Upper leaf surface simple hairs absent or erect, straight, sparse, not gland-tipped or gland-tipped, 0.2–0.8 mm long. Upper leaf surface Type 2 hairs present throughout. Upper leaf surface Type 2 hairs 0.02–0.05 mm apart.

Lower leaf surface. Lower leaf surface greenish-white. Lower leaf surface prickles present on midvein only or present on midvein and lateral veins, 5–16, straight, acicular. Lower leaf surface stellate hair density moderate or dense. Lower leaf surface stellae 0.2–0.4 mm apart, 0.5–0.9 mm diameter, stalks 0–0.1 mm long. Lower leaf surface stellae lateral rays 4–12, porrect or multiradiate. Lower leaf surface stellae central ray 1.5–3 times as long as laterals, not gland-tipped. Lower leaf surface simple hairs absent or erect, straight, sparse, gland-tipped, 0.2–0.3 mm long. Lower leaf surface Type 2 hairs absent or present throughout, 0.03–0.1 mm apart.

Inflorescence. Inflorescence leaf-opposed or supra-axillary, cymose (pseudo-racemose). Inflorescence common peduncle absent or present, 0–16 mm long. Inflorescence rachis prickles present. Inflorescence 4–6-flowered. Flowers 5-merous. Pedicels at anthesis 16–30 mm long, same thickness throughout, 0.5 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 2.5–4 mm long. Calyx lobes at anthesis deltate, 3.5–5 mm long. Calyx prickles at anthesis present, 5–45 per flower, 3–6 mm long. Calyx stellae moderate or dense, transparent, 0.4–0.8 mm across, stalks 0–0.1 mm long, lateral rays 3–7. Calyx stellae central ray 1.5–3 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs present. Corolla purple, 11–17 mm long, rotate, inner surface glabrous. Anthers 4–4.6 mm long. Ovary with Type 2 hairs only. Functional style 5.5–7 mm long, protruding between anthers, glabrous or with Type 2 hairs only.

Fruits. Fruiting calyx lobes more than half length of mature fruit, prickles 2–3 mm long. Mature fruits 1 per inflorescence, globular. Pedicels at fruiting stage 15–28 mm long, 0.8 mm thick at mid-point.

Distribution and habitat. New South Wales, Victoria. NSW: Central-west Slopes, North Western Plains, South Western Plains.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • young plant.


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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