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Apium is a genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of about 20 species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of flowering plant
Flowering plant
The flowering plants , also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants. Angiosperms are seed-producing plants like the gymnosperms and can be distinguished from the gymnosperms by a series of synapomorphies...

s in the family Apiaceae
The Apiaceae , commonly known as carrot or parsley family, is a group of mostly aromatic plants with hollow stems. The family is large, with more than 3,700 species spread across 434 genera, it is the sixteenth largest family of flowering plants...

, with a subcosmopolitan
Cosmopolitan distribution
In biogeography, a taxon is said to have a cosmopolitan distribution if its range extends across all or most of the world in appropriate habitats. For instance, the killer whale has a cosmopolitan distribution, extending over most of the world's oceans. Other examples include humans, the lichen...

 distribution in Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

, Asia
Asia is the world's largest and most populous continent, located primarily in the eastern and northern hemispheres. It covers 8.7% of the Earth's total surface area and with approximately 3.879 billion people, it hosts 60% of the world's current human population...

, Africa
Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

, South America
South America
South America is a continent situated in the Western Hemisphere, mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere. The continent is also considered a subcontinent of the Americas. It is bordered on the west by the Pacific Ocean and on the north and east...

 and Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. They are medium to tall biennial
Biennial plant
A biennial plant is a flowering plant that takes two years to complete its biological lifecycle. In the first year the plant grows leaves, stems, and roots , then it enters a period of dormancy over the colder months. Usually the stem remains very short and the leaves are low to the ground, forming...

 or perennial
Perennial plant
A perennial plant or simply perennial is a plant that lives for more than two years. The term is often used to differentiate a plant from shorter lived annuals and biennials. The term is sometimes misused by commercial gardeners or horticulturalists to describe only herbaceous perennials...

 plants growing wet ground (marsh
In geography, a marsh, or morass, is a type of wetland that is subject to frequent or continuous flood. Typically the water is shallow and features grasses, rushes, reeds, typhas, sedges, other herbaceous plants, and moss....

es and salt marsh
Salt marsh
A salt marsh is an environment in the upper coastal intertidal zone between land and salt water or brackish water, it is dominated by dense stands of halophytic plants such as herbs, grasses, or low shrubs. These plants are terrestrial in origin and are essential to the stability of the salt marsh...

es). They grow up to 1 m high and have pinnate to bipinnate leaves
A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants....

 and small white flower
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants . The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs...

s in compound umbel
An umbel is an inflorescence which consists of a number of short flower stalks which are equal in length and spread from a common point, somewhat like umbrella ribs....


The genus is the type genus
Biological type
In biology, a type is one particular specimen of an organism to which the scientific name of that organism is formally attached...

 of the family Apiaceae and the order Apiales.

Species include:
  • Apium annuum P.S.Short
  • Apium australe
  • Apium bermejoi
    Apium bermejoi
    Apium bermejoi is a critically endangered species of flowering plant in the Apiaceae family. It is closely related to the wild form of celery, A. graveolens. A. bermejoi is now endemic to a single location in the northeast part of the island of Minorca in the Balearic Islands of Spain...

  • Apium fernandezianum - Johow.
  • Apium filiforme
  • Apium graveolens L. - Celery, Wild Celery
  • Apium inundatum
  • Apium insulare
    Apium insulare
    Apium insulare, Flinder's Island celery, is a herb of the Bass Strait islands, and Lord Howe Island, Australia....

  • Apium leptophyllum
  • Apium nodiflorum
    Apium nodiflorum
    Apium nodiflorum, commonly called Fool's-water-cress is a flowering plant found in ditches or streams and native to western Europe. It is a low-growing or prostrate perennial with pinnate leaves which have a vague resemblance to those of watercress...

    - Fool's water cress
  • Apium prostratum
    Apium prostratum
    Apium prostratum, commonly known as sea celery, is a variable herb native to coastal Australia. The leaves are variable, with toothed leaflets, and a celery like aroma. The tiny white flowers occur in clusters.There are two varieties:...

    Vent. - Sea Celery
  • Apium repens

Some species are edible, notably Apium graveolens (Celery), which is a commercially important vegetable
The noun vegetable usually means an edible plant or part of a plant other than a sweet fruit or seed. This typically means the leaf, stem, or root of a plant....


Apium species, including garden celery, are eaten by the larva
A larva is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle...

e of some Lepidoptera
Lepidoptera is a large order of insects that includes moths and butterflies . It is one of the most widespread and widely recognizable insect orders in the world, encompassing moths and the three superfamilies of butterflies, skipper butterflies, and moth-butterflies...

 species including Angle Shades
Angle Shades
The Angle Shades is a moth of the family Noctuidae. It is a common and familiar European species and is often strongly migratory....

, Common Swift
Common Swift (moth)
The Common Swift is a moth of the family Hepialidae. It was previously placed in the genus Hepialus. It is a common, often abundant European species....

, Hypercompe icasia
Hypercompe is a genus of moths of the family Arctiidae. There are over 80 species found throughout the Americas. Several species were formerly separated in Ecpantheria which is now regarded as a junior synonym. They are typically large moths with white forewings heavily spotted with black, and...

, The Nutmeg
Nutmeg (moth)
The nutmeg , also known as the clover cutworm, is a moth of the family Noctuidae. It is found throughout Europe although in the north of its range it is a summer migrant, not being able to survive the cold winters.This is a small to medium species with cryptically coloured forewings, varying from...

, Setaceous Hebrew Character
Setaceous Hebrew Character
The Setaceous Hebrew Character is a moth of the family Noctuidae. It is found in the Palearctic ecozone. It is a common species throughout Europe. It is also found in North America, from coast to coast across Canada and the northern United States to western Alaska. It occurs in the Rocky Mountains...

 and Turnip Moth
Turnip Moth
The Turnip Moth is a moth of the family Noctuidae. It is a common European species, but it is also found in Asia and Africa, very likely having been spread by the international trade in nursery stock...


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