genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
plant
Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclud ...
s in the family
Polygonaceae
The Polygonaceae are a family of flowering plants known informally as the knotweed family or smartweed—buckwheat family in the United States. The name is based on the genus ''Polygonum'', and was first used by Antoine Laurent de Jussieu in 1789 ...
.
Plants of the World Online
Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...
accepts two
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
, native to
Iran
Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
,
Oman
Oman ( ; ar, عُمَان ' ), officially the Sultanate of Oman ( ar, سلْطنةُ عُمان ), is an Arabian country located in southwestern Asia. It is situated on the southeastern coast of the Arabian Peninsula, and spans the mouth of t ...
shrub
A shrub (often also called a bush) is a small-to-medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees ...
s. The few leaves may be arranged alternately or in bundles (fascicled). The
ochrea
An ochrea (Latin ''ocrea'', greave or protective legging), also spelled ocrea, is a plant structure formed of stipules fused into a sheath surrounding the stem, and is typically found in the Polygonaceae
The Polygonaceae are a family of flower ...
is short. The flowers are small and
bisexual
Bisexuality is a romantic or sexual attraction or behavior toward both males and females, or to more than one gender. It may also be defined to include romantic or sexual attraction to people regardless of their sex or gender identity, whi ...
, with five
tepal
A tepal is one of the outer parts of a flower (collectively the perianth). The term is used when these parts cannot easily be classified as either sepals or petals. This may be because the parts of the perianth are undifferentiated (i.e. of very ...
s, two outer and three inner, the three inner clasping the fruit when it forms. There are eight
stamen
The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10
Morphology and terminology
A stamen typically consists of a stalk called the filame ...
s. The ovary is three-angled with three styles. The fruit has three broad wings.
Taxonomy
The genus was erected by
Hippolyte François Jaubert
Count Hippolyte François Jaubert (28 October 1798 – 5 December 1874) was a French politician and botanist.
Jaubert was born in Paris, the son of François Hippolyte Jaubert (a commissioner of the French Navy, killed at the Battle of the Nil ...
and
Édouard Spach
Édouard Spach (23 November 1801 – 18 May 1879) was a French botanist.
The son of a merchant in Strasbourg, in 1824 he went to Paris, where he studied botany with René Desfontaines (1750–1831) and Antoine-Laurent de Jussieu (1748–1836). ...
in 1844. It is placed in the subfamily
Polygonoideae
Polygonoideae is a subfamily of plants in the family Polygonaceae. It includes a number of plants that can be highly invasive, such as Japanese knotweed, ''Reynoutria japonica'', and its hybrid with '' R. sachalinensis'', ''R.'' × ''bohemica'' ...
, tribe Calligoneae, along with its sister genus ''
Calligonum
''Calligonum'' is a genus of plants in the family Polygonaceae with about 80 species across the Mediterranean Sea region, Asia and North America.
Description
Plants of the genus ''Calligonum'' are shrubs, diffusely but irregularly branched, wi ...
''.
Species
, sources varied considerably in the number of species assigned to the genus.
Plants of the World Online
Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...
accepted the following two species:
*'' Pteropyrum aucheri'' Jaub. & Spach (
synonym
A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...
''Pteropyrum ericoides'' Boiss.)
*'' Pteropyrum scoparium'' Jaub. & Spach
Other sources listed more species, some with an "unresolved" status. These include:
*'' Pteropyrum olivierii'' Jaub. & Spach (synonyms ''Pteropyrum gracile'' Boiss., ''Pteropyrum griffithii'' Meisn.)
*''
Pteropyrum naufelum
''Pteropyrum'' is a genus of plants in the family Polygonaceae. Plants of the World Online accepts two species, native to Iran, Oman and the Arab states of the Persian Gulf, Gulf States.
Description
Species of ''Pteropyrum'' are shrubs. The few ...