Solanum nigrescens
Solanum aviculare
divine nightshade
New Zealand nightshade
petiolate;
petiole 0.5–2 cm;
blade simple, ovate to ovate-elliptic, 4–10.5 × 2–5 cm, margins entire or shallowly sinuate-dentate, base decurrent.
petiolate;
petiole 1–1.5 cm;
blade simple, elliptic, 10–30 × 2–15 cm, margins entire or coarsely pinnatifid with 1–3 lobes per side, lobe margins entire, base cuneate.
extra-axillary or leaf-opposed, unbranched, umbel-like to racemelike, (2–)5–10-flowered, 1–3.5 cm.
leaf-opposed or in branch fork, unbranched or forked, to 10-flowered, to 15 cm.
spreading and 0.5–1 cm in flower, spreading and 1–1.5 cm in fruit.
1.5–2 cm in flower and fruit.
radially symmetric;
calyx not accrescent, unarmed, 1–2 mm, sparsely pubescent, lobes deltate;
corolla white, rarely purplish, often with green or purplish central star, stellate, 1–1.5 cm diam., with sparse interpetalar tissue;
stamens equal;
anthers ellipsoidal, 2–3 mm, dehiscent by terminal pores that open into longitudinal slits;
ovary glabrous.
radially symmetric;
calyx somewhat accrescent, unarmed, 3–4 mm, glabrous, lobes deltate;
corolla blue to deep purple, rotate-stellate, lobes acute at apex, 3–4 cm diam., with abundant interpetalar tissue;
stamens equal;
anthers oblong, slightly tapered, 3–4 mm, dehiscent by terminal pores that sometimes open into longitudinal slits;
ovary glabrous.
dull green or purplish, globose, 0.5–0.8 cm diam., glabrous, with (4–)5–6(–13) sclerotic granules.
bright orange to red, obovoid to ellipsoidal, 1.5–2 × 1–1.5 cm, glabrous, with sclerotic granules inconspicuous to absent.
tan, flattened, 1.2–1.5 × 1–1.1 mm, finely pitted.
reddish brown, flattened, 1.5–2 × 1.5–2 mm, finely reticulate.
= 24.
= 46.
Solanum nigrescens
Solanum aviculare
Solanum nigrescens is widespread in Central and northern South America and the Caribbean and extends northward into the southeastern United States along the Gulf Coast and slightly inland. Where sympatric with S. americanum, it can be distinguished by its longer anthers and dull green or purplish berries with appressed to spreading calyx lobes. Plants collected as weeds in rice and sugarcane fields of Louisiana and provisionally identified as the Chinese species S. merrillianum T. N. Liou are somewhat intermediate between S. americanum and S. nigrescens and could represent recent hybrid populations (S. Knapp et al. 2019). Solanum nigrescens differs from S. douglasii in its shorter anthers and longer filaments relative to anther length; moreover, S. douglasii is usually found west of the Rocky Mountains, whereas S. nigrescens occurs in the southeastern United States. The ranges of S. nigrescens and S. interius overlap (for example, in Texas). Solanum nigrescens may be distinguished from S. interius by its usually acute calyx lobes, smaller seeds, and more numerous sclerotic granules in the fruits. Solanum nigrescens differs from S. nigrum in its more slender peduncles and pedicels, smaller seeds, and fruits with sclerotic granules.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The name Solanum laciniatum Aiton has been misapplied to S. aviculare (for example, M. Nee 1993). Although only S. aviculare is listed in that treatment as occurring in California, both S. aviculare and S. laciniatum apparently are found there, and most photos labeled S. aviculare on the CalFlora website are of S. laciniatum. Solanum laciniatum has notched and ruffled corolla lobes with abundant interpetalar tissue (versus acute and entire corolla lobes with little interpetalar tissue in S. aviculare) and yellow fruits (versus red) with numerous stone cells (versus stone cells inconspicuous to absent).
Solanum aviculare and S. laciniatum have been introduced from Australia and New Zealand as ornamentals and now are found in scattered localities in California, especially near the coast. Some plants have escaped and become naturalized, and these species have the potential to be invasive in the future.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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