Solanum species of eastern and northern Australia

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A. R. Bean

Solanum stupefactum

Habit. Erect, rhizomatous perennial shrub, 1–2 m high.

Branchlets. Branchlets white or brown. Branchlet prickles 25–45 per decimetre, straight, acicular, 4–10 mm long, 9–15 times longer than wide, with scattered Type 2 hairs on lower half. Branchlet hairs Type 2 or stellate. Branchlet stellae dense, 0.5–1.2 mm diameter, stalks 0–2 mm long. Branchlet stellae lateral rays 6–8, porrect. Branchlet stellae central ray 2–4 times as long as laterals, not gland-tipped, thready. Branchlet Type 2 hairs dense.

Leaves. Leaves elliptical or ovate, entire. Leaves 4.5–9 cm long, 2.2–4.3 cm wide, 1.7–2.4 times longer than broad. Leaf apex obtuse or acute, base cuneate or obtuse or cordate. Leaf oblique part 0–3 mm long, obliqueness index 0–4 percent. Petioles 0.8–2 cm long, 17–25% length of lamina, prickles absent or present.

Upper leaf surface. Upper leaf surface green. Upper leaf surface prickles absent or present on midvein only, 0–2, straight, acicular, 5–9 mm long. Upper leaf surface stellate hairs distributed throughout, protostellae present, hair density moderate density to dense. Upper leaf surface stellae 0.3–0.5 mm apart, 0.5–0.9 mm across, stalks 0–0.3 mm long. Upper leaf surface stellae lateral rays 6–9, porrect. Upper leaf surface stellae central ray 2–4 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 0.3–0.8 mm apart.

Lower leaf surface. Lower leaf surface green. Lower leaf surface prickles absent. Lower leaf surface stellate hair density dense. Lower leaf surface stellae 0.1–0.2 mm apart, 0.5–0.9 mm diameter, stalks 0–1.1 mm long. Lower leaf surface stellae lateral rays 7–8, porrect. Lower leaf surface stellae central ray 2–3 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 7–21 mm long. Inflorescence rachis prickles present. Inflorescence 5–9-flowered, with one bisexual flower, the rest male. Flowers 5-merous, markedly dimorphic, with larger pricklier basal flower(s). Pedicels at anthesis 10–25 mm long, same thickness throughout, 0.5–0.7 mm thick at mid-point, prickles present. Calyx prickles on basal bisexual flowers 10–18, 1–7 mm long. Calyx prickles on distal male flowers 0. Calyx tube at anthesis 3–5 mm long. Calyx lobes at anthesis deltate, 6–8 mm long. Calyx prickles at anthesis absent or present, 0–18 per flower, 1–7 mm long. Calyx stellae very dense, yellow or white or brown or rusty, 0.6–1.5 mm across, stalks 0.3–1.7 mm long, lateral rays 5–7. Calyx stellae central ray 1–3 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla white or mauve or purple, 9–20 mm long, rotate or shallowly lobed, inner surface glabrous. Anthers 4.5–7 mm long. Ovary with stellate hairs only. Functional style 7–11 mm long, protruding between anthers, with stellate hairs only. Functional style stellae 0.5–0.9 mm across, central ray 2–4 times as long as laterals. Stigma forked or expanded, obtuse or lobed.

Fruits. Fruiting calyx lobes less than half length of mature fruit, prickles 1–7 mm long. Mature fruits 1 per inflorescence, globular or ellipsoidal or ovoid, 18–26 mm diameter, orange, conspicuously stellate hairy, 2-locular. Mature fruits placenta stalked, anvil-shaped. Mature fruits interior moist but not juicy, pericarp 2.2–3 mm thick. Pedicels at fruiting stage 15–25 mm long, 1.1–1.6 mm thick at mid-point. Seeds pale yellow or black, 2.8–3.5 mm long.

Distribution and habitat. Queensland. Qld: Moreton, Darling Downs, Burnett. Wet eucalypt forest with rainforest understorey, or rainforest margins.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • flowers. • plants. • flower and mature fruit. • flower buds.


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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