''Brassica rupestris'' is a species of flowering plant in the family

Brassicaceae Brassicaceae () or (the older) Cruciferae () is a medium-sized and economically important family of flowering plants commonly known as the mustards, the crucifers, or the cabbage family. Most are herbaceous plants, while some are shrubs. The le ...

, native to southwestern Italy, and Sicily. The plant is known to grow on vertical limestone cliffs. In the past it was proposed, based on morphology, that ''Brassica rupestris'' contributed to the ancestry of either

kale Kale (), or leaf cabbage, belongs to a group of cabbage (''Brassica oleracea'') cultivars grown for their edible leaves, although some are used as ornamentals. Kale plants have green or purple leaves, and the central leaves do not form a head ...

kohlrabi Kohlrabi (pronounced ; scientific name ''Brassica oleracea'' Gongylodes Group (horticulture), Group), also called German turnip or turnip cabbage, is a Biennial plant, biennial vegetable, a low, stout cultivar of wild cabbage. It is a cultivar o ...

, but DNA evidence shows that it did not.

Taxonomy

''Brassica rupestris'' was described and named by

Constantine Samuel Rafinesque Constantine Samuel Rafinesque-Schmaltz (; October 22, 1783September 18, 1840) was a French 19th-century polymath born near Constantinople in the Ottoman Empire and self-educated in France. He traveled as a young man in the United States, ultimat ...

in 1810. In 1997 Francesco Raimondo and Pietro Mazzola erected a subspecies, ''Brassica rupestris'' subsp. ''hispida'', based on very slight differences including leaf hairiness and

silique A silique or siliqua (plural ''siliques'' or ''siliquae'') is a type of fruit (seed capsule) having two fused carpels with the length being more than three times the width. When the length is less than three times the width of the dried fruit i ...

size, which is not supported by molecular studies.

Subtaxa

The following subtaxa are currently accepted: *''Brassica rupestris'' subsp. ''hispida'' – Sicily *''Brassica rupestris'' subsp. ''rupestris'' – southwestern Italy, Sicily

Chemistry

There were a number of substances of note found in the roots and shoots of ''B.rupestris''. These were

tartaric acid Tartaric acid is a white, crystalline organic acid that occurs naturally in many fruits, most notably in grapes, but also in bananas, tamarinds, and citrus. Its salt, potassium bitartrate, commonly known as cream of tartar, develops naturally i ...

ester, reduced

glutathione Glutathione (GSH, ) is an antioxidant in plants, animals, fungi, and some bacteria and archaea. Glutathione is capable of preventing damage to important cellular components caused by sources such as reactive oxygen species, free radicals, pero ...

(GSH),

ascorbic acid Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits and vegetables, also sold as a dietary supplement and as a topical 'serum' ingredient to treat melasma (dark pigment spots) an ...

dehydroascorbic acid Dehydroascorbic acid (DHA) is an oxidized form of ascorbic acid (vitamin C). It is actively imported into the endoplasmic reticulum of cells via glucose transporters. It is trapped therein by reduction back to ascorbate by glutathione and othe ...

glucobrassicin Glucobrassicin is a type of glucosinolate that can be found in almost all cruciferous plants, such as cabbages, broccoli, mustards, and woad. As for other glucosinolates, degradation by the enzyme myrosinase is expected to produce an isothiocyana ...

, and

glucoraphanin Glucoraphanin is a glucosinolate found in broccoli, mustard and other cruciferous vegetables. Glucoraphanin is converted to sulforaphane by the enzyme myrosinase. In plants, sulforaphane deters insect predators and acts as a selective antibioti ...

Distribution and habitat

''Brassica rupestris'' subsp. ''rupestris'' is found in mountainous areas of

Calabria , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , demographics1_title2 ...

and

Sicily (man) it, Siciliana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Ethnicity , demographics1_footnotes = , demographi ...

, and has been reassessed as

Least Concern A least-concern species is a species that has been categorized by the International Union for Conservation of Nature (IUCN) as evaluated as not being a focus of species conservation because the specific species is still plentiful in the wild. T ...

, while ''B.rupestris'' subsp. ''hispida'' is found in a number of stations in Sicily and has been reassessed as Vulnerable. Both subspecies typically live on near-vertical limestone cliffs, with ''B.rupestris'' subsp. ''rupestris'' found from above sea level, and ''B.rupestris'' subsp. ''hispida'' found from .

References

rupestris Flora of Italy Flora of Sicily Plants described in 1810 {{Brassicales-stub