''Buddleja curviflora'' is a deciduous

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 ...

native to southern

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

and Taiwan, where it grows in thickets on stony slopes at elevations of 100–300 m. ''B. curviflora'' was named and described

Hooker Hooker may refer to: People * Hooker (surname) Places Antarctica * Mount Hooker (Antarctica) * Cape Hooker (Antarctica) * Cape Hooker (South Shetland Islands) New Zealand * Hooker River * Mount Hooker (New Zealand) in the Southern Alps * Hoo ...

and Arnott in 1838.Stuart, D. (2006). ''Buddlejas''. Timber Press, Oregon, USA. Plants in Taiwan have been described as a separate species '' Buddleja formosana'' and assessed as Critically Endangered by

IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

, but the distinction is not recognized by Li and Leeuwenberg, who sank ''formosana'' as a synonym.Li, P. T. & Leeuwenberg, A. J. M. (1996). Loganiaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 15. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, US.
online at www.efloras.org
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Description

''Buddleja curviflora'' grows to < 2 m in height in the wild, its branches subquadrangular in section, and

glabrescent 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 of ...

. The leaves are opposite, lanceolate to ovate, 5–15 cm long by 2–6 cm wide, the upper surface glabrous, the underside almost

glaucous ''Glaucous'' (, ) is used to describe the pale grey or bluish-green appearance of the surfaces of some plants, as well as in the names of birds, such as the glaucous gull (''Larus hyperboreus''), glaucous-winged gull (''Larus glaucescens''), g ...

. The purple flowers are borne on slender, terminal, one-sided panicles 5–15 cm long; flowering occurs in June and July.

Ploidy Ploidy () is the number of complete sets of chromosomes in a cell (biology), cell, and hence the number of possible alleles for Autosome, autosomal and Pseudoautosomal region, pseudoautosomal genes. Sets of chromosomes refer to the number of mat ...

2''n'' = 38 (diploid).Chen, G, Sun, W-B, & Sun, H. (2007). Ploidy variation in Buddleja L. (Buddlejaceae) in the Sino - Himalayan region and its biogeographical implications. ''Botanical Journal of the Linnean Society.'' 2007, 154, 305 – 312. The Linnean Society of London.

Cultivation

The shrub is rare in cultivation. In the UK, specimens are grown at the Royal Botanic Garden Edinburgh, the Royal Horticultural Society garden at

Wisley __NOTOC__ Wisley is a village and civil parish in Surrey, England between Cobham and Woking, in the Borough of Guildford. It is the home of the Royal Horticultural Society's Wisley Garden. The River Wey runs through the village and Ockham and ...

, and at

Longstock Park Longstock Park is in the civil parish of Longstock in the Test Valley district of Hampshire, England, and forms part of the Leckford Estate (1520 ha.), wholly owned by the John Lewis Partnership. Description Formerly Longstock Manor, of med ...

Nursery,

NCCPG Plant Heritage, formerly known as the National Council for the Conservation of Plants and Gardens (NCCPG), is a botanical conservation organisation in the United Kingdom and a registered charity. It was founded in 1978 to combine the talents of b ...

national collection holder, near

Stockbridge, Hampshire Stockbridge is a small town and civil parish in the Test Valley district of Hampshire, England. It is one of the smallest towns in the United Kingdom with a population of 592 at the 2011 census. It sits astride the River Test and at the foot of ...

. Hardiness: USDA zones 8–9.

References

* Leeuwenberg, A. J. M. (1979) ''The Loganiaceae of Africa XVIII Buddleja L. II, Revision of the African & Asiatic species''. H. Veenman & Zonen B. V., Wageningen, Netherlands. {{Taxonbar, from=Q4984449 curviflora Flora of Japan Flora of Taiwan