Solanum americanum |
Solanum setigeroides |
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American black nightshade, American black or common or West Indian nightshade, glossy nightshade, little white nightshade, small-flower nightshade, white nightshade |
bristly nightshade |
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Habit | Herbs to subshrubs, annual to perennial, erect, unarmed, to 1.5 m, glabrate to moderately pubescent, hairs whitish, unbranched, to 1 mm, eglandular. | Herbs, annual, spreading, branching from near base, densely armed, 0.3–0.7 m, prickles straight, 4–8 mm, 30+ per cm of stem, sparsely pubescent, hairs ca. 0.2 mm, stipitate-glandular, abaxial leaf surfaces also with scattered, sessile, 4–6-rayed, stellate hairs, central ray equal to lateral rays. |
Leaves | petiolate; petiole 1–4 cm; blade simple, ovate to ovate-elliptic, 2–10.5 × 1–4.5 cm, margins entire or shallowly sinuate-dentate, base decurrent. |
petiolate; petiole 2–7 cm; blade simple to compound, broadly ovate to deltate, 4–11 × 4–8 cm, margins twice-lobed to twice-divided with 2–3 main leaflets per side, leaflets with obtuse or rounded lobes, base truncate. |
Inflorescences | extra-axillary or leaf-opposed, unbranched, usually umbel-like, 3–10-flowered, 0.5–3 cm. |
extra-axillary, unbranched, 5–9-flowered, 4–10 cm. |
Pedicels | erect or spreading, 0.3–1 cm in flower, to 1.5 cm in fruit. |
1–2 cm in flower, erect and 1–2 cm in fruit. |
Flowers | radially symmetric; calyx somewhat accrescent, unarmed, 1–3 mm, lobes deltate, strongly reflexed in fruit; corolla white, sometimes with yellowish central star, stellate, 0.4–0.8 cm diam., without interpetalar tissue; stamens equal; anthers ellipsoidal, 0.7–1.5 mm, dehiscent by terminal pores that open into longitudinal slits; ovary glabrous. |
bilaterally symmetric; calyx accrescent and tightly covering fruit, densely prickly, 4.5–6.5 mm, sparsely glandular-pubescent, lobes lanceolate; corolla violet or blue, pentagonal, 1–1.5 cm diam., with abundant interpetalar tissue; stamens unequal, lowermost much longer and curved; anthers narrow and tapered, dehiscent by terminal pores, short anthers 2–4 mm, longer anther 3.5–5 mm; ovary glabrous. |
Berries | shiny purplish black, globose, 0.5–1 cm diam., glabrous, with (0–)2–4(–6) sclerotic granules, usually 2–4 larger and 2 smaller. |
brown, globose, 1–1.2 cm diam., glabrous, dry, without sclerotic granules. |
Seeds | pale yellow to brown, 1–1.5 × 0.5–1.5 mm, minutely pitted. |
dark brown, flattened, 2.5–3 × 2–2.5 mm, minutely pitted and weakly ridged or faceted. |
2n | = 24. |
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Solanum americanum |
Solanum setigeroides |
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Phenology | Flowering May–Nov (year-round in Fla.). | Flowering Jun–Oct. |
Habitat | Weedy habitats, secondary forest, disturbed areas. | Silty, sandy, or gravelly soils, playas, dunes, streambeds, arroyos, open hillsides. |
Elevation | 0–1000(–2000) m. (0–3300(–6600) ft.) | 600–2000 m. (2000–6600 ft.) |
Distribution |
AL; AZ; CA; FL; GA; LA; MO; MS; OR; SC; TX; UT; WA; BC; Mexico; Central America; South America; West Indies [Introduced in Europe, Asia, Africa, Pacific Islands, Australia]
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AZ; NM; TX; Mexico (Chihuahua) |
Discussion | Solanum americanum is a morphologically variable and globally distributed weedy species. It has often been confused with other species in the black nightshade group such as S. emulans, S. nigrescens, S. nigrum, and S. pseudogracile and has often been referred to as S. nodiflorum in floristic treatments. It is distinguished by its very short anthers and shiny black mature fruits with strongly reflexed calyx lobes and usually two to four (rarely none or as many as six) sclerotic granules per fruit. Leaf shape and pubescence can vary considerably throughout its range, and there are some suspected cases of introgression with other species such as S. nigrescens or S. pseudogracile. The name S. nigrum has been misapplied to S. americanum (for example, A. E. Radford et al. 1968). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Solanum setigeroides is a weed of disturbed and overgrazed places ranging from central Arizona and New Mexico to extreme western Texas. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 14. | FNA vol. 14. |
Parent taxa | Solanaceae > Solanum | Solanaceae > Solanum |
Sibling taxa | ||
Synonyms | S. nigrum var. americanum, S. nigrum var. nodiflorum, S. nodiflorum, S. ptychanthum | S. heterodoxum var. setigeroides |
Name authority | Miller: Gard. Dict. ed. 8 Solanum no. 5. (1768) | (Whalen) S. R. Stern: J. Bot. Res. Inst. Texas 8: 5. (2014) |
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