''Pentaphylax euryoides'' () is a species of
flowering plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...
in the
Pentaphylacaceae
The Pentaphylacaceae are a small family of plants within the order Ericales. In the APG III system of 2009, it includes the former family Ternstroemiaceae.
Genera
In 2014, the Angiosperm Phylogeny Website included 14 genera in the family. Plant ...
family. It is the sole species in genus ''Pentaphylax''. It is a shrub or small tree native to southern China, Vietnam, Laos, Peninsular Malaysia, and northern
Sumatra
Sumatra () is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the list of islands by area, sixth-largest island in the world at 482,286.55 km2 (182,812 mi. ...
.
[ In China, it is found in ]Guangdong
) means "wide" or "vast", and has been associated with the region since the creation of Guang Prefecture in AD 226. The name "''Guang''" ultimately came from Guangxin ( zh, labels=no, first=t, t= , s=广信), an outpost established in Han dynasty ...
, Guangxi
Guangxi,; officially the Guangxi Zhuang Autonomous Region, is an Autonomous regions of China, autonomous region of the China, People's Republic of China, located in South China and bordering Vietnam (Hà Giang Province, Hà Giang, Cao Bằn ...
, Guizhou
)
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, Hainan
Hainan is an island provinces of China, province and the southernmost province of China. It consists of the eponymous Hainan Island and various smaller islands in the South China Sea under the province's administration. The name literally mean ...
, and Yunnan
Yunnan; is an inland Provinces of China, province in Southwestern China. The province spans approximately and has a population of 47.2 million (as of 2020). The capital of the province is Kunming. The province borders the Chinese provinces ...
provinces, and in southern parts of Fujian
Fujian is a provinces of China, province in East China, southeastern China. Fujian is bordered by Zhejiang to the north, Jiangxi to the west, Guangdong to the south, and the Taiwan Strait to the east. Its capital is Fuzhou and its largest prefe ...
, Hunan
Hunan is an inland Provinces of China, province in Central China. Located in the middle reaches of the Yangtze watershed, it borders the Administrative divisions of China, province-level divisions of Hubei to the north, Jiangxi to the east, Gu ...
, and Jiangxi
; Gan: )
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.
Description
The species is tall with its petioles being long. The species has simple evergreen leaves that are alternately arranged on the stems. The leaf-blades are lanceolate
The following terms are used to describe leaf plant morphology, morphology in the description and taxonomy (biology), taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade ...
, oblong, ovate and are long by wide. Pedicels
In botany, a pedicel is a stem that attaches a single flower to the inflorescence
In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branch ...
are and carry triangular shaped bract
In botany, a bract is a modified or specialized leaf, associated with a reproductive structure such as a flower, inflorescence axis or cone scale.
Bracts are usually different from foliage leaves in size, color, shape or texture. They also lo ...
eoles which are as long as the petiole.[
Flowers have five petals and five ]sepal
A sepal () is a part of the flower of angiosperms (flowering plants). Usually green, sepals typically function as protection for the flower in bud, and often as support for the petals when in bloom., p. 106
Etymology
The term ''sepalum'' ...
s that are distinct from each other and five stamens attached oppositely to the sepals. Sepals are long and orbicular. The flower pistil is 5 celled and the anthers dehiscing via pores and basifixed. The five stamen
The stamen (: stamina or stamens) is a part consisting of the male reproductive organs of a flower. Collectively, the stamens form the androecium., p. 10
Morphology and terminology
A stamen typically consists of a stalk called the filament ...
s are and oblong. The seed
In botany, a seed is a plant structure containing an embryo and stored nutrients in a protective coat called a ''testa''. More generally, the term "seed" means anything that can be Sowing, sown, which may include seed and husk or tuber. Seeds ...
s are winged, reddish-brown in colour, and long.[
]
Taxonomy
The APG III system
The APG III system of flowering plant classification is the third version of a modern, mostly molecular-based, system of plant taxonomy being developed by the Angiosperm Phylogeny Group (APG). Published in 2009, it was superseded in 2016 by a f ...
of 2009 places the genus in the family Pentaphylacaceae
The Pentaphylacaceae are a small family of plants within the order Ericales. In the APG III system of 2009, it includes the former family Ternstroemiaceae.
Genera
In 2014, the Angiosperm Phylogeny Website included 14 genera in the family. Plant ...
, along with genera formerly placed in the Ternstroemiaceae. ''Pentaphylax'' has often been placed in its own family, the Pentaphylacaceae, separated from the Theaceae
Theaceae (), the tea family, is a family of flowering plants comprising shrubs and trees, including the economically important tea plant, and the ornamental camellias. It can be described as having from seven to 40 genera, depending on the sour ...
or Ternstroemiaceae based on the structure of the anthers and, arguably, the ovules. However, some molecular data and curved embryos (typical of the Ternstroemiaceae) point to a close relationship with the Ternstroemiaceae.
The taxonomic placement of this species and the family has varied, due mostly to a shortage of information. Included here are some classifications given by different botanist
Botany, also called plant science, is the branch of natural science and biology studying plants, especially Plant anatomy, their anatomy, Plant taxonomy, taxonomy, and Plant ecology, ecology. A botanist or plant scientist is a scientist who s ...
s:
* Short's Subclass Dicotyledonae; Crassinucelli (?).
* Dahlgren's Superorder Theiflorae (?); Theales (?).
* Cronquist’s Subclass Dilleniidae; Theales.
*Angiosperm Phylogeny Group
The Angiosperm Phylogeny Group (APG) is an informal international group of systematic botanists who collaborate to establish a consensus on the taxonomy of flowering plants (angiosperms) that reflects new knowledge about plant relationships disc ...
(1998) family of uncertain position at the highest group level.[Pentaphylacaceae Engl.](_blank)
Angiosperm Phylogeny Website
The Angiosperm Phylogeny Website (or APweb) is a website that presents up-to-date research on the phylogeny and taxonomy of flowering plants (angiosperms) in what is intended to be a user-friendly way.
The site is hosted by the Missouri Botanical ...
*subfamily Ternstroemioideae within the Theaceae.
References
External links
Picture
{{Taxonbar, from1=Q6071472, from2=Q15394248
Pentaphylacaceae
Flora of South-Central China
Flora of Southeast China
Flora of Hainan
Flora of Laos
Flora of Peninsular Malaysia
Flora of Sumatra
Flora of Vietnam
Monotypic Ericales genera
Plants described in 1849