''Terminalia phillyreifolia'' is an Asian species of tree in the family

Combretaceae The Combretaceae, often called the white mangrove family, are a family of flowering plants in the order Myrtales. The family includes about 530 species of trees, shrubs, and lianas in ca 10 genera. The family includes the leadwood tree, '' Combr ...

. It has been called buttontree or yon (from ;

IPA IPA commonly refers to: * India pale ale, a style of beer * International Phonetic Alphabet, a system of phonetic notation * Isopropyl alcohol, a chemical compound IPA may also refer to: Organizations International * Insolvency Practitioner ...

: ). It is a medium-sized tree found in both primary and secondary tropical and sub-tropical

forests A forest is an area of land dominated by trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, and ecological function. The United Nations' ...

. It is recorded from India to China, south to Thailand and Vietnam. It may be one of the dominant species of deciduous forests of

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making it ...

. In Yunnan it is found in rocky limestone areas, near sea level to . Besides timber uses, the bark of this species has a high tannin content.

Taxonomy

Formerly known as ''

Anogeissus ''Anogeissus'' is a genus of trees in the family Combretaceae. The 10''Anogeissus''.
F ...

acuminata'', a 2017 article embedded genera including ''Anogeissus'' into ''Terminalia''. Several varieties were accepted in the 2017 Catalogue of Life checklist; no varieties are listed in Kew's

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 ...

Description

In China, where it is known as 榆绿木 (yu lü mu), these trees grow to tall with a trunk to in diameter at breast height. In Myanmar they may be larger: up to tall and up to girth, with a straight and cylindrical trunk. The branchlets are slightly pendent, slender, together with petioles and leaf blades golden villous when young. The petioles are cylindrical, 2–6 mm and the

leaf A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

blades are

lanceolate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regula ...

to narrowly so, 40-80 × 10–30 mm long, grey-green on the back and pilose mostly in the axils of lateral veins. They are green and

glabrous Glabrousness (from the Latin '' glaber'' meaning "bald", "hairless", "shaved", "smooth") is the technical term for a lack of hair, down, setae, trichomes or other such covering. A glabrous surface may be a natural characteristic of all or part o ...

to glabrescent on the leaf surface. The leaf base is narrowed or obtuse, the apex

acuminate The following is a list of terms which are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (a single leaf blade or lamina) or compound (with several leaflets). The edge of the leaf may be regular ...

. There are five to seven inconspicuous lateral veins in pairs. The flowers are numerous sessile on

flower heads A pseudanthium (Greek for "false flower"; ) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, compos ...

9–13 mm in diameter;

bracts In botany, a bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis or cone scale. Bracts are usually different from foliage leaves. They may be smaller, larger, or o ...

are easily deciduous and linear, 4–5 mm long. The

calyx Calyx or calyce (plural "calyces"), from the Latin ''calix'' which itself comes from the Ancient Greek ''κάλυξ'' (''kálux'') meaning "husk" or "pod", may refer to: Biology * Calyx (anatomy), collective name for several cup-like structures ...

tubes are approximately 5 mm long, abaxially yellow pubescent, densely so on ovary and tubular part, and more sparsely so on the cup-shaped part. The filaments are 3–4 mm long. The fruits are approximately 6 × 5 mm long including a "beak". They are ferruginous pubescent distally and on the beak. ''Terminalia phillyreifolia'' flowers between February and March in Bangladesh and Thailand.

References

{{Taxonbar, from1=Q13073894, from2=Q11120322 phillyreifolia Flora of Asia