Solanum species of eastern and northern Australia

DELTA Home

A. R. Bean

Solanum senticosum

Habit. Erect, rhizomatous perennial shrub, 0.3–0.6 m high.

Branchlets. Branchlets rusty or brown. Branchlet prickles 180–400 per decimetre, straight, acicular, 1.5–6 mm long, 11–18 times longer than wide, glabrous or with dense stellate hairs on lower part. Branchlet hairs stellate. Branchlet stellae very dense, 0.6–0.9 mm diameter, stalks 0–0.4 mm long. Branchlet stellae lateral rays 7–8, porrect or ascending. Branchlet stellae central ray 0.6–1.2 times as long as laterals, not gland-tipped, thready or rigid.

Leaves. Leaves elliptical or ovate, entire. Leaves 3.5–9 cm long, 1.2–3.4 cm wide, 1.9–2.7 times longer than broad. Leaf apex acute, base cuneate. Leaf oblique part 0–5 mm long, obliqueness index 0–9 percent. Petioles 0.7–1.7 cm long, 19–30% length of lamina, prickles present.

Upper leaf surface. Upper leaf surface grey. Upper leaf surface prickles absent or present on midvein only, 0–6, straight, acicular, 1–4 mm long. Upper leaf surface stellate hairs distributed throughout, hair density dense. Upper leaf surface stellae 0.1–0.25 mm apart, 0.6–1 mm across, stalks 0–0.25 mm long. Upper leaf surface stellae lateral rays 7–8, porrect. Upper leaf surface stellae central ray 0.8–1.2 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 rusty. Lower leaf surface prickles absent or present on midvein only or present on midvein and lateral veins, 0–10, straight, acicular. Lower leaf surface stellate hair density dense to very dense. Lower leaf surface stellae 0.1–0.2 mm apart, 0.7–1 mm diameter, stalks 0–0.6 mm long. Lower leaf surface stellae lateral rays 7–8, porrect. Lower leaf surface stellae central ray 0.6–1.2 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, solitary or cymose (pseudo-racemose). Inflorescence common peduncle absent or present, 0–2 mm long. Inflorescence rachis prickles present. Inflorescence 1–3-flowered. Flowers 5-merous. Pedicels at anthesis 5–11 mm long, same thickness throughout, 0.9–1.2 mm thick at mid-point, prickles absent or present. Calyx tube at anthesis 2–3.5 mm long. Calyx lobes at anthesis attenuate, 4–9 mm long. Calyx prickles at anthesis present, 40–65 per flower, 1–4 mm long. Calyx stellae very dense, brown or rusty, 0.4–0.6 mm across, stalks 0–0.2 mm long, lateral rays 6–8. Calyx stellae central ray 0.6–1.2 times as long as laterals, not gland-tipped. Calyx simple hairs absent, Type 2 hairs absent. Corolla purple, 7–11 mm long, shallowly lobed or deeply lobed, inner surface glabrous. Anthers 4–4.5 mm long. Ovary glabrous. Functional style 7.5–8.5 mm long, protruding between anthers, glabrous.

Fruits. Fruiting calyx lobes more than half length of mature fruit, prickles 2–5 mm long. Mature fruits 1–2 per inflorescence, globular, 13 mm diameter, yellowish-green or green, often streaked. Mature fruits interior moist but not juicy. Pedicels at fruiting stage 6–14 mm long, 1.2–1.5 mm thick at mid-point.

Distribution and habitat. Queensland. Qld: Mitchell, Gregory North, Burke. Shrubby eucalypt woodland, remote from rainforest, shrublands in arid zone.

Miscellaneous. Subg. Leptostemonum. Data source: specimens.

Illustrations. • 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’.

Contents