Flora of North America species comparison

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Solanum elaeagnifolium

horse nettle, silver-leaf nightshade, white horse-nettle
Habit Herbs or shrubs, perennial, erect, rhizomatous, sparsely to densely armed, to 1 m, prickles orange to brown, straight, to 5 mm, densely silvery-pubescent, hairs sessile or subsessile, stellate, scalelike, 10–15-rayed, central ray shorter than lateral rays, lateral rays fused at center.
Leaves

petiolate;

petiole 1–5 cm;

blade simple, lanceolate to oblong, 5–15 × 0.5–3 cm, margins undulate, subentire to sinuate or shallowly lobed, lobe margins entire, base truncate to cuneate.
Inflorescences

extra-axillary, unbranched, 3–5(–7)-flowered, 3–5 cm.
Pedicels

1–3 cm in flower, reflexed and 1–3 cm in fruit.
Flowers

radially symmetric;

calyx not accrescent, unarmed or with sparse prickles, 5–10 mm, densely silvery-stellate-pubescent, lobes linear-lanceolate;

corolla pale to deep blue or violet, rarely white, pentagonal-stellate, 2–3(–3.5) cm diam., with abundant interpetalar tissue;

stamens equal;

anthers narrow and tapered, 6–9 mm, dehiscent by terminal pores;

ovary glabrous to densely stellate-pubescent.
Berries

yellow to orange, drying brown or black, globose, 0.5–1.5 cm diam., glabrous, without sclerotic granules.
Seeds

yellowish, flattened, 3–5 × 2–4 mm, minutely pitted.
2n

= 24, 48, 72.

Solanum elaeagnifolium
Phenology Flowering Mar–Nov.
Habitat Dry sites, open woods, dis­turbed areas, roadsides, railroads, fields.
Elevation 0–2100 m. [0–6900 ft.]
Distribution
from FNA
AL; AR; AZ; CA; CO; FL; GA; ID; IL; IN; KS; KY; LA; MD; MO; MS; NC; NE; NM; NV; OK; OR; SC; TN; TX; UT; WA; Mexico; West Indies; South America (Argentina, Chile, Paraguay, Uruguay) [Introduced elsewhere in South America (Colombia, Peru), Eurasia (Mediterranean, Middle East, India, Pakistan), Africa, Australia]
[WildflowerSearch map]
[BONAP county map]
Discussion

Solanum elaeagnifolium has a disjunct native distribution. It occurs in arid regions of the southwestern United States and Mexico and also in Argentina, Chile, Paraguay, and Uruguay. North American plants are diploid, whereas those in Argentina are diploid, tetraploid, or hexaploid. It is invasive and considered a noxious weed in 21 states in the flora area as well as in many tropical and subtropical regions worldwide. It is toxic to livestock and can form large, rhizomatous patches that are difficult to eradicate.

A white-flowered form has been recognized as Solanum elaeagnifolium forma albiflorum Cockerell.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 14. Treatment authors: Lynn Bohs1, 1The author wishes to acknowledge co-authorship with David M. Spooner† on S. jamesii and S. stoloniferum and with Sandra Knapp and Tiina Särkinen on the black nightshade species..
Parent taxa Solanaceae > Solanum
Sibling taxa
S. americanum, S. aviculare, S. bahamense, S. campechiense, S. capsicoides, S. carolinense, S. chenopodioides, S. citrullifolium, S. cordicitum, S. davisense, S. deflexum, S. dimidiatum, S. diphyllum, S. donianum, S. douglasii, S. dulcamara, S. emulans, S. erianthum, S. furcatum, S. hindsianum, S. interius, S. jamaicense, S. jamesii, S. laciniatum, S. lanceolatum, S. lumholtzianum, S. lycopersicum, S. marginatum, S. mauritianum, S. nigrescens, S. nigrum, S. nitidibaccatum, S. novomexicanum, S. perplexum, S. pseudocapsicum, S. pseudogracile, S. pumilum, S. rostratum, S. sarrachoides, S. seaforthianum, S. setigeroides, S. sisymbriifolium, S. stoloniferum, S. tampicense, S. tenuipes, S. torvum, S. triflorum, S. triquetrum, S. umbelliferum, S. viarum, S. wallacei
Name authority Cavanilles: Icon. 3: 22, plate 243. (1795)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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