普康金花茶 Camellia pukhangensis N.D.Do, V.D.Luong, S.T.Hoang & T.H.LêCamellia pukhangensis

Camellia pukhangensis N.D.Do, V.D.Luong, S.T.Hoang & T.H.Lê. First published in Korean J. Pl. Taxon. 49: 90 (2019). TYPE: VIETNAM. Nghe An Province: Quy Hop District, 15 Jan 2018, Dai Ngoc Do & Huong Thi Le 186 (holotype: DLU).

Shrubs or small trees, 2–8 m tall, evergreen; young branches hirsute, becoming glabrous mature. Leaves shortly stalked; petiole 5–8 mm long, hirsute; blades oblong, 16–24 cm long, 5.5–8 cm wide, base cordate; margin serrate, apex attenuate to caudate, coriaceous, abaxially hirsute, adaxially hirsute only on midrib, lateral veins 16–20 pairs, abaxial veins protruding, adaxial midrib and lateral veins sunken. Flowers 5.5–6.5 cm in diameter, solitary at apex of branches, sessile or subsessile; bracteole and sepals indistinguishable (perules) 11–13, deltate to ovate, 0.3–4 cm long, 0.2–1.8 cm wide, abaxially hairy, margins ciliate. Petals 10–13, orbicular to obovate, bright yellow, 3–4.5 cm long, 2.3–4 cm wide, abaxially hairy, united with outermost filaments 1–1.5 cm at base. Stamens 350–390, in 5 or 6 series, light yellow, 3–3.5 cm long, pubescent to 2/ 3 from base, outer filaments united for 1.7–2 cm from base to form a cup; anthers yellow, 3–3.5 mm long, ca. 1 mm wide. Ovary with 3(or 4) loculi, ovoid, light yellow, 4–4.5 mm long, 4–5 mm wide, pubescent; styles 3(or 4), free to base, 3–3.2 cm long, pubescent. Capsules not seen.

Etymology: The specific epithet refers to the type location, Pu Khang Mountain in Nghe An Province, Vietnam, where it was discovered. 

Phenology: Flowering from November to March; fruiting period unknown.

Distribution: Camellia pukhangensis occurs in forests in Lien Hop Commune, Quy Hop District, Nghe An Province, at altitudes of 500–900 m. It is scattered on mountain sides and among rocks in association with species of Clusiaceae, Euphorbiaceae, Melastomataceae, Myrtaceae, and Lauraceae. Additional specimens examined: VIETNAM. Nghe An Province: Quy Hop District, 15 Jan 2018, Dai Ngoc Do & Huong Thi Le 187, 188 (DLU).

IUCN Red List category: Camellia pukhangensis is known from only one population of 122 individuals that occupies an area of less than 1 km2. The location is currently threatened by cutting and agricultural expansion, hence, the species is provisionally categorized as Critically Endangered (CR) B2a (IUCN, 2017)

VIETNAM:  Nghe An Province: Quy Hop District

普康金花茶 Camellia pukhangensis N.D.Do, V.D.Luong, S.T.Hoang & T.H.Lê. in Korean J. Pl. Taxon. 49: 90 (2019)。

灌木或小乔木，高2-8米，常绿；幼枝具长硬毛，成熟后变得无毛。叶有短柄；叶柄长5-8毫米，具长硬毛；叶片长圆形，长16-24厘米，宽5.5-8厘米，基部心形；边缘有锯齿，先端渐狭至尾状，具革质，背面具长硬毛，正面仅中脉上具长硬毛，侧脉16-20对，背面脉突出，正面中脉和侧脉下陷。花直径5.5-6.5厘米，单生于枝顶，无柄或近无柄；小苞片和萼片难以区分（小苞片）11-13，三角形至卵形，长0.3-4厘米，宽0.2-1.8厘米，背面有毛，边缘具缘毛。花瓣10-13，圆形至倒卵形，鲜黄色，长3-4.5厘米，宽2.3-4厘米，背面有毛，基部与最外层花丝合生1-1.5厘米。雄蕊350-390枚，5或6轮，淡黄色，长3-3.5厘米，被短柔毛至基部的2/3，外花丝在基部1.7-2厘米处结合成杯状；花药黄色，长3-3.5毫米，宽约1毫米。子房有3（或4）子房室，卵球形，淡黄色，长4-4.5毫米，宽4-5毫米，被短柔毛；花柱3（或4），离生至基部，长3-3.2厘米，被短柔毛。蒴果未见。

词源： 种加词是模式产地--越南义安省的普康山。

物候： 花期 11 月至 3 月；果期未知。

分布： 普康金花茶（Camellia pukhangensis）分布于义安省贵合县莲合公社海拔 500-900 米的森林中，散布于山边和岩石间，与木犀科（Clusiaceae）、大戟科（Euphorbiaceae）、桔梗科（Melastomataceae）、桃金娘科（Myrtaceae）和月桂科（Lauraceae）的植物伴生。已检查的其他标本： 越南义安省 Quy Hop区，2018年1月15日，Dai Ngoc Do & Huong Thi Le 187, 188（DLU）。

世界自然保护联盟红色名录类别： 山茶花（Camellia pukhangensis）只有一个122个个体的种群，占地面积不到1平方公里。目前，该地点正受到砍伐和农业扩张的威胁，因此，该物种被暂时归类为极危（CR）B2a（世界自然保护联盟，2017 年）。

越南义安省的普康山