Solanum diphyllum

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Twoleaf nightshade
Solanum diphyllum - USDA ARS 2.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Solanales
Family: Solanaceae
Genus: Solanum
Species:
S. diphyllum
Binomial name
Solanum diphyllum
L.
Solanum diphyllum distribution.png
Distribution of S. diphyllum. Native range is in green. Areas under which it had been naturalized or are widely cultivated are in orange.

Solanum diphyllum, commonly known as the twoleaf nightshade, [1] is a species of nightshade native to the Americas. It is cultivated as an ornamental plant for its clusters of dark green round fruits that turn a bright yellow when ripe.

Contents

Taxonomy

Unripe berries and a leaf pair (major and minor leaf) relative to a human hand. Solanum diphyllum berries and leaves.jpg
Unripe berries and a leaf pair (major and minor leaf) relative to a human hand.
The inflorescence and fruits of twoleaf nightshades are borne opposite of the leaf pairs. Solanum diphyllum inflorescence.jpg
The inflorescence and fruits of twoleaf nightshades are borne opposite of the leaf pairs.
Pollen grains of Solanum diphyllum Pollen grains of Solanum diphyllum.jpg
Pollen grains of Solanum diphyllum

Twoleaf nightshade is classified under the subgenus Minon. It belongs to the tribe Solaneae, subfamily Solanoideae, under the very large and diverse nightshade family (Solanaceae). It was first described by Carl Linnaeus in his 1753 book Species Plantarum . [2]

The forest nightshade ( Solanum nudum ), another species altogether, was originally illegitimately named Solanum diphyllum by the Spanish botanists Martín Sessé y Lacasta and José Mariano Mociño in 1894, despite the name already being used. [3]

Twoleaf nightshade may sometimes be confused with the Jerusalem cherry ( Solanum pseudocapsicum ), another nightshade grown for its brightly colored berries, and referred to by various synonyms, some of which were once classified as its cultivars. Within the genus, it most closely resembles a rare species in western Mexico, Solanum malacothrix . [4]

Twoleaf nightshade is also known as twinleaf nightshade, twin-leaved nightshade, two-leaf nightshade, and other variations of the name. The specific epithet 'diphyllum' means "two leaf", referring to the arrangement of its leaves. It is sometimes called by other names such as tomatillo (not to be confused with the edible Physalis philadelphica ), amatillo, and 黄果龙葵 (Huang guo long kui). [4] [5] [6]

Description

Ripe and unripe berries of twoleaf nightshades. Solanum diphyllum - USDA ARS 4.jpg
Ripe and unripe berries of twoleaf nightshades.

Twoleaf nightshade grows as a small shrub about 1 to 2 m (3.3 to 6.6 ft) tall. The stems are smooth or sometimes slightly downy with a dark brown bark. [4]

A distinctive feature of twoleaf nightshade is that its leaves grow in pairs from a single bud, hence the name 'twoleaf'. Each pair is composed of a major and a minor leaf. Major leaves average around 6 cm (2.4 in) long by 2 cm (0.79 in) wide and are elliptic to oblong in shape. Minor leaves are smaller and more rounded; they are 2 cm (0.79 in) long by 1 cm (0.39 in) wide on average. [6] The leaves are a glossy dark green on the upper surface with a lighter green on the ventral side. The petioles are about 2 mm (0.079 in) in length. [4]

The inflorescences are borne opposite the leaves. Each bears about 5 to 20 closely spaced flowers. The flower buds are white and globular when young but become more lavender in color and elongated as they mature. They bloom into tiny white flowers with a lavender tinge about 1 cm (0.39 in) across. [4]

The fruits are spherical berries with a slight division around the middle, especially when unripe. They are green and hard when young, around 1 cm (0.39 in) in diameter. They mature into bright yellow to orange fleshy and juicy berries about 1.2 cm (0.47 in) in diameter. They are mounted on the flower calyces on long and thin pedicels. Each berry contains numerous seeds. [4]

The seeds are flattened and kidney-shaped (resembling bell pepper seeds), each about 3 mm (0.12 in) long and 2.5 mm (0.098 in) wide. They have pale margins and are minutely pitted. [4]

Distribution and habitat

Twoleaf nightshade is native to Northern and Central America in Mexico, Belize, Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. [2] It is widely cultivated as an ornamental plant in subtropical and tropical parts of the world like Southern France, Italy, and Taiwan. [4] [6] It has escaped cultivation in some areas and become naturalized in Florida and Texas, United States; [5] Java, Indonesia; the Philippines; and the West Indies. [7] [1]

Twoleaf nightshade is a ruderal species, colonizing newly disturbed lands. [8] It also grows in mangrove forests. [9]

Ecology and cultivation

Twoleaf nightshade is grown for its attractive clusters of green and yellow berries. The plants are spread very easily. Fruits are eaten by birds and bats, both of which help disperse the seeds. The seeds are especially hardy, able to survive being buried in an inch of soil for up to two years. Seventy five to eighty five percent of the seeds will sprout. [5]

The plant is poisonous to humans. [5]

Methods of controlling it in areas where it is unwanted mostly involve being familiar with its growing habits and appearance and uprooting the plants before they bear fruits. [5]

Phylogeny

Twoleaf nightshade belongs to the Geminata clade, section Holophylla , along with Solanum pseudocapsicum and Solanum pseudoquina . [10]

See also

Related Research Articles

<i>Solanum</i> Genus of flowering plants

Solanum is a large and diverse genus of flowering plants, which include three food crops of high economic importance: the potato, the tomato and the eggplant. It is the largest genus in the nightshade family Solanaceae, comprising around 1,500 species. It also contains the so-called horse nettles, as well as numerous plants cultivated for their ornamental flowers and fruit.

<i>Solanum carolinense</i> Species of plant

Solanum carolinense, the Carolina horsenettle, is not a true nettle, but a member of the Solanaceae, or nightshade family. It is a perennial herbaceous plant, native to the southeastern United States, though its range has expanded throughout much of temperate North America. The plant is an invasive in parts of Europe, Asia, Africa and Australia. The stem and undersides of larger leaf veins are covered with prickles.

<i>Solanum dulcamara</i> Species of plant

Solanum dulcamara is a species of vine in the genus Solanum of the family Solanaceae. Common names include bittersweet, bittersweet nightshade, bitter nightshade, blue bindweed, Amara Dulcis, climbing nightshade, felonwort, fellenwort, felonwood, poisonberry, poisonflower, scarlet berry, snakeberry, trailing bittersweet, trailing nightshade, violet bloom, and woody nightshade.

<i>Solanum pseudocapsicum</i> Species of plant

Solanum pseudocapsicum is a nightshade species with mildly poisonous fruit. It is commonly known as the Jerusalem cherry, Madeira winter cherry, or, ambiguously, "winter cherry". These perennials can be grown decoratively as house plants, but in some areas of South Africa, India, Australia and New Zealand it is regarded as a weed.

<i>Solanum americanum</i> Species of flowering plant in the nightshade family Solanaceae

Solanum americanum, commonly known as American black nightshade, small-flowered nightshade or glossy nightshade, is a herbaceous flowering plant of wide though uncertain native range. The certain native range encompasses the tropics and subtropics of the Americas, Melanesia, New Guinea, and Australia.

<i>Solanum nigrum</i> Species of flowering plant in the nightshade family Solanaceae

Solanum nigrum, the European black nightshade or simply black nightshade or blackberry nightshade, is a species of flowering plant in the family Solanaceae, native to Eurasia and introduced in the Americas, Australasia, and South Africa. Ripe berries and cooked leaves of edible strains are used as food in some locales, and plant parts are used as a traditional medicine. Some other species may also be referred to as "black nightshade".

<i>Lycopersicon</i> Obsolete genus of flowering plants

Lycopersicon was a genus in the flowering plant family Solanaceae. It contained about 13 species in the tomato group of nightshades. First removed from the genus Solanum by Philip Miller in 1754, its removal leaves the latter genus paraphyletic, so modern botanists generally accept the names in Solanum. The name Lycopersicon is still used by gardeners, farmers, and seed companies. Collectively, the species in this group apart from the common cultivated plant are called wild tomatoes.

<i>Solanum elaeagnifolium</i> Species of flowering plant

Solanum elaeagnifolium, the silverleaf nightshade or silver-leaved nightshade, is a species of plant in the nightshade family native to North and South America. It is common in parts of southwestern USA, and sometimes weed of western North America. Other common names include prairie berry, silverleaf nettle, white horsenettle or silver nightshade. In South Africa it is known as silver-leaf bitter-apple or satansbos. More ambiguous names include "bull-nettle", "horsenettle" and the Spanish "trompillo".

<i>Solanum lanceolatum</i> Species of flowering plant

Solanum lanceolatum, with the common names orangeberry nightshade and lanceleaf nightshade, is a species of nightshade. It is native to regions of South America, including the Cerrado ecoregion of the Tropical and subtropical grasslands, savannas, and shrublands biome, primarily in Brazil.

<i>Solanum caripense</i> Species of plant

Solanum caripense is a species of evergreen shrub native to South America and grown for its edible fruit.

<i>Solanum tampicense</i> Species of flowering plant

Solanum tampicense, also known as wetland nightshade, aquatic soda apple, and scrambling nightshade, is a perennial in the Solanaceae or Nightshade Family. It can exist as a vine, tree, or shrub and is native to the West Indies and Central America. It is classified as a noxious weed by the United States Department of Agriculture and by several states and is known as an invasive species in the state of Florida.

<i>Solanum opacum</i> Species of plant in the family Solanaceae

Solanum opacum is a species of flowering plant in the family Solanaceae. It is referred to by the common names green berry nightshade, or morelle verte and is a sprawling annual native to eastern Australia. It is part of the black nightshade group of Solanum species.

<i>Solanum scabrum</i> Species of flowering plant

Solanum scabrum, also known as garden huckleberry, is an annual or perennial plant in the nightshade family. The geographic origin of the species is uncertain; Linnaeus attributed it to Africa, but it also occurs in North America, and it is naturalized in many countries. In Africa it is cultivated as a leaf vegetable and for dye from the berries.

<i>Solanum chilense</i> Species of flowering plant

Solanum chilense is a plant species from the "tomato" subgenus Lycopersicon within the nightshade genus Solanum.

Solanum arcanum is a species of flowering plant in the nightshade family Solanaceae in section Lycopersicon, the tomatoes, endemic to Peru.

Solanum tepuiense is a plant species native to Venezuela. It is known from one collection, from a low-elevation sandstone flat-topped mountain named Sororopán-Tepuí, near the Gran Sabana Region in the State of Bolívar in the eastern part of the country.

<i>Solanum pachyandrum</i> Species of flowering plant

Solanum pachyandrum, known as bombona, is a spine-forming vine of the Solanum genus. It is native to southwestern Ecuador and northwestern Peru where the large juicy fruit is commonly eaten and considered a treat by children. Although the plant has been known and consumed by the indigenous people of that land, it was only published scientifically in 1914 by German botanist Friedrich August Georg Bitter.

<i>Solanum sturtianum</i> Species of plant

Solanum sturtianum, commonly known as Sturt’s nightshade or Thargomindah nightshade, is a flowering plant from the Solanaceae (nightshade) family. Distinct by its purple flowers and dark-black fruits, it is a shrub endemic to the arid zones of mainland Australia.

<i>Solanum esuriale</i> Native Australian plant

Solanum esuriale is a species of perennial herbaceous plant native to Australia.

<i>Solanum petrophilum</i> Species of plant

Solanum petrophilum, commonly known as rock nightshade or prickly nightshade, is an Australian native perennial herbaceous plant that belongs to the family Solanaceae. Solanaceae has a worldwide distribution and also contains important food species such as the tomato, peppers, and potatoes.

References

  1. 1 2 USDA, NRCS (n.d.). "Solanum diphyllum". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved November 17, 2015.
  2. 1 2 "Solanum diphyllum L." Germplasm Resources Information Network . Agricultural Research Service, United States Department of Agriculture . Retrieved May 15, 2011.
  3. Sandra Knapp (2008). "Typification of Solanum (Solanaceae) species described by Martín de Sessé y Lacasta and José Mariano Mociño" (PDF). Anales del Jardín Botánico de Madrid (in English and Spanish). 65 (1). Consejo Superior de Investigaciones Científicas: 7–23. doi: 10.3989/ajbm.2008.v65.i1.243 . ISSN   0211-1322 . Retrieved May 15, 2011.
  4. 1 2 3 4 5 6 7 8 Sandra Knapp (2004). "Solanum diphyllum L., Sp. Pl. 184. 1753. Type: America?, Anon. s.n. (lectotype, LINN 248.5, designated by Knapp & Jarvis, 1991)". Solanaceae Source, Natural History Museum. Retrieved May 15, 2011.
  5. 1 2 3 4 5 Dan Culbert (October 2, 2005). "The Weed with Two Leaves". IFAS Extension, University of Florida. Retrieved May 16, 2011.
  6. 1 2 3 Zhang Zhi-yun; Lu An-ming & William G. D'Arcy (1994). "Solanaceae (茄科)" (PDF). Flora of China (中国植物志). 17. Science Press & Missouri Botanical Garden: 300–332. Archived from the original (PDF) on July 14, 2009. Retrieved May 16, 2011.
  7. Sandra Knapp (2009). "Synopsis and lectotypification of Solanum (Solanaceae) species endemic in the West Indies". Anales del Jardín Botánico de Madrid (in English and Spanish). 66 (1). Consejo Superior de Investigaciones Científicas: 65–84. doi: 10.3989/ajbm.2209 . ISSN   0211-1322 . Retrieved May 16, 2011.
  8. Ed Weislo. "Invasive Exotic Plants in Florida". Florida's Nature. Retrieved May 16, 2011.[ permanent dead link ]
  9. Carmen Teresa Cuevas-Arias; Ofelia Vargas & Aarón Rodríguez (2008). "Solanaceae diversity in the state of Jalisco, Mexico (Diversidad de la familia Solanaceae en el estado de Jalsico, México)" (PDF). Revista Mexicana de Biodiversidad (in English and Spanish). 79. Instituto de Biología: 67–79. ISSN   1870-3453 . Retrieved May 16, 2011.
  10. "Solanum phylogeny". Solanaceae Source, Natural History Museum. 2004. Retrieved May 15, 2011.