Sweet Basil

Ocimum basilicum

Basil, also called great basil, is a culinary herb of the family Lamiaceae. It is a tender plant, and is used in cuisines worldwide. In Western cuisine, the generic term "basil" refers to the variety also known as sweet basil or Genovese basil.
Ocimum basilicum var. purpureum, Dark opal basil is a cultivar of Ocimum basilicum (sweet basil). I love this variant of Basil for it‘s strong taste and flavor but also because it‘s decorative effects on dishes. Therefore I grow it. 
Besides that, all Basils seem to have healthy ingredients such as what makes the purple color, anthocyanins, especially cyanidin-3-(di-p-coumarylglucoside)-5-glucoside but also other cyanidin based and peonidin based compounds.
Anthocyanins as found in Berries are said to be anti inflammatory.  Geotagged,Germany,Ocimum basilicum,Spring,Sweet Basil

Appearance

Basil is an annual, or sometimes perennial, herb used for its leaves. Depending on the variety, plants can reach heights of between 30 and 150 cm. Its leaves are richly green and ovate, but otherwise come in a wide variety of sizes and shapes depending on cultivar. Leaf sizes range from 3 to 11 cm long, and between 1 and 6 cm wide. Basil grows a thick, central taproot. Its flowers are small and white, and grow from a central inflorescence, or spike, that emerges from the central stem atop the plant. Unusual among Lamiaceae, the four stamens and the pistil are not pushed under the upper lip of the corolla, but lie over the inferior lip. After entomophilous pollination, the corolla falls off and four round achenes develop inside the bilabiate calyx.
Ocimum basilicum, sweet basil or Genovese basil This Basil Genovese is one of the four varieties that I grow on a regular basis. We use it for Italian dishes and to make Pesto Genovese.  Basil,Geotagged,Germany,Ocimum basilicum,Spring

Naming

The name "basil" comes from the Latin, and the Greek, meaning "royal/kingly plant", possibly because the plant was believed to have been used in production of royal perfumes. Basil is likewise sometimes referred to in French as. The Latin name has been confused with basilisk, as it was supposed to be an antidote to the basilisk's venom.Some similar species in the same genus may be commonly called "basil", although they are not varieties of "Ocimum basilicum".

⤷  Camphor basil, African basil
⤷  Clove basil, also African basil
⤷  Holy basil
The Thai Basil, basilicum var. thyrsiflora One if the four Basils that I grow on a regular basis. Excellent flavor  for asian dishes. 
It has narrower leaves than Italian basil and a distinctive liquorice touch in taste and smell. Geotagged,Germany,Ocimum basilicum,Spring,Sweet Basil

Distribution

Basil is native to India and other tropical regions stretching from Africa to South East Asia, but has now become globalized due to human cultivation.
purple basil flower whenever I pick these off the tops of the plant the entire room has a basil fragrance for a little while Ocimum basilicum,Sweet Basil,indoor plant,purple basil

Habitat

Basil is native to India and other tropical regions stretching from Africa to South East Asia, but has now become globalized due to human cultivation.

Uses

Basil, freshNutritional value per 100 g Energy94 kJ Carbohydrates2.65 gDietary fiber1.6 g
Fat0.64 g
Protein3.15 g

Cultural

There are many rituals and beliefs associated with basil. The ancient Egyptians and ancient Greeks believed basil would open the gates of heaven for a person passing on.better source needed Jewish folklore suggests it adds strength while fasting.better source needed However, Herbalist Nicholas Culpeper saw basil as a plant of dread and suspicion.

In Portugal, dwarf bush basil is traditionally presented in a pot, together with a poem and a paper carnation, to a sweetheart, on the religious holidays of John the Baptist and Saint Anthony of Padua. In Giovanni Boccaccio's 14th century "Decameron", the fifth story of the narrative's fourth day involves a pot of basil as a central plot device. This famous story inspired John Keats to write his 1814 poem "Isabella, or the Pot of Basil", which was in turn the inspiration for two paintings of the Pre-Raphaelite Brotherhood: John Everett Millais's "Isabella" in 1849 and in 1868 the "Isabella and the Pot of Basil" by William Holman Hunt.

Basil has religious significance in the Greek Orthodox Church, where it is used to sprinkle holy water. The Bulgarian Orthodox Church, Serbian Orthodox Church, Macedonian Orthodox Church and Romanian Orthodox Church use basil to prepare holy water and pots of basil are often placed below church altars. Some Greek Orthodox Christians even avoid eating it due to its association with the legend of the Elevation of the Holy Cross.

References:

Some text fragments are auto parsed from Wikipedia.

Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderLamiales
FamilyLamiaceae
GenusOcimum
SpeciesO. basilicum