河静山茶 Camellia hatinhensis V.D.Luong, Ninh & L.T.NguyenCamellia hatinhensis

Camellia hatinhensis V.D.Luong, Ninh & L.T.Nguyen. First published in Korean J. Pl. Taxon. 48: 118 (2018)

The specimen was discovered by Luong Van Dung, Nguyen Thi Lieu, Do Cong Thuan, Nguyen Viet Hung in 2016 - 2017 in Vu Quang district, Ha Tinh province. In 2018, the group of authors Nguyen Thi Lieu, Tran Ninh, Uematsu Chiyomi, Katayama Hironori, Luong Van Dung, Hoang Thanh Son, Nguyen Danh Ky, Nguyen Viet Hung and Thai Canh Toan published in the Korean Journal of Plant Taxonomy with the scientific name Camellia hatinhensis. The Vietnamese name is Tra Ha Tinh, after the place name of the province where the specimen was first discovered.

Camellia hatinhensis Luong, Tran & L. T. Nguyen, sp. nov. (Figs. 3, 4).—TYPE: VIETNAM. Ha Tinh province, Vu Quang district, 27 Aug 2017, Luong Van Dung, Tran Ninh, Nguyen Thi Lieu, Do Cong Thuan, Nguyen Viet Hung VN.0354 (holotype, isotype: DLU). Shrubs or small trees, 4–6 m tall, young branches villous becoming glabrous with age. Leaves stalked; blade thick and coriaceous, oblong, 11–15 cm long and 3–5 cm wide, glabrous above, villous below, the apex acuminate to long caudate; the base broadly cuneate or nearly rounded, the midribs sunken above and protruding below main leaf, 10 to 14 pairs of lateral veins sunken above and protruding below the main leaf, the margins serrulate or serrate; petioles 1 1.3 mm long, villous. Flowers solitary at branch apices, white, 8–9 cm in diameter, the pedicel absent. Perules 9 or 10, nearly rounded, 0.4–2.3 cm high, 0.3–2.1 cm wide, pubescent on both sides, persistent, margins ciliate. Petals 10 or 11, elliptical, nearly rounded, obovate, retire, 2.7–4.8 cm long, 2.3–4.5 cm wide, pubescent on both sides, united with outermost filaments 0.5–1.3 cm at the base. Androecium over 300 stamens, in 6 or 7 circles, 3–3.5 cm long, pubescent, outer filaments united from the base and forming a short cup, united 1.3–1.6 cm at the base. Ovary nearly rounded, 3 locular, tomentose, 0.5 cm long, 0.4 cm wide; styles 3, free to the base, 3–3.3 cm long, tomentose. Fruits globose, pubescent, 3.5–4 cm in diameter, 3-locular, with 1 or 2 seeds in each locule, columella abortive. Seeds cuneate or semiglobose, 1.6–1.9 cm high, 1.1–1.4 cm wide, glabrous.

Distribution and phenology: This species was found in the forest of Vu Quang National Park, Vu Quang district, Ha Tinh province, at the elevation over 100 m. Flowering: August to September; Fruiting: October to November.

Etymology: The specific epithet of the new species refers to the location of discovery, Ha Tinh province, Vietnam.

IUCN Red List category: The AOO for C. hatinhensis is estimated to be less than 1 km2 . Despite a further search of the area around the type locality and other forests in the vicinity, only eight additional mature trees were found. The total known population of the species is fewer than 50 individuals, and it would be qualifid as CR under criterion D (IUCN, 2011)

Taxonomic remarks: Camellia hatinhensis possesses some morphological characteristics common to the species C. gauchowensis Chang, C. oleifera Abel; C. sasanqua Thunb. and C. vietnamemsis Huang ex Hu (Gao et al., 2005) belonging to Section Oleifera Hung T. Chang (Chang and Bartholomew, 1984). All these species have terminal flowers which are sessile and white; bracteoles and sepals are not differentiated, coriaceous; ovaries 3-locular; styles 3–5. Therefore the species should be classified into Sect. Oleifera Hung T. Chang. The main similarities and differences between C. hatinhensis with C. gauchowensis, C. oleifera, C. sasanqua, and C. vietnamemsis are summarized in Table 2.

Vu Quang district, Ha Tinh province, Vietnam

该标本由 Luong Van Dung、Nguyen Thi Lieu、Do Cong Thuan、Nguyen Viet Hung 于 2016 - 2017 年在河静省武广县发现。2018 年，由 Nguyen Thi Lieu、Tran Ninh、Uematsu Chiyomi、Katayama Hironori、Luong Van Dung、Hoang Thanh Son、Nguyen Danh Ky、Nguyen Viet Hung 和 Thai Canh Toan 组成的作者小组在《韩国植物分类学杂志》上发表了学名为 Camellia hatinhensis 的文章。越南语名称为 Tra Ha Tinh，取自首次发现该标本的省份的地名。

Camellia hatinhensis Luong, Tran & L. T. Nguyen, sp： 越南。河静省，武广地区，2017年8月27日，Luong Van Dung, Tran Ninh, Nguyen Thi Lieu, Do Cong Thuan, Nguyen Viet Hung VN.0354（主模式，同模式：DLU）。灌木或小乔木，高 4-6 米，幼枝具长柔毛，老时变得无毛。叶有柄；叶片厚而具革质，长圆形，长11-15厘米，宽3-5厘米，上面无毛，下面具长柔毛，先端渐尖到长尾状；基部宽楔形或近圆形，中脉在上面凹陷，在主叶下面突出，10到14对侧脉在上面凹陷，在主叶下面突出，边缘有细锯齿或锯齿；叶柄长1 1.3毫米，具长柔毛。花单生于枝条顶端，白色，直径 8-9 厘米，无花梗。花被 9 或 10，近圆形，高 0.4-2.3 厘米，宽 0.3-2.1 厘米，两面被短柔毛，宿存，边缘具缘毛。花瓣 10 或 11，椭圆形，近圆形，倒卵形，退休，长 2.7-4.8 厘米，宽 2.3-4.5 厘米，两面被短柔毛，基部与最外层花丝合生 0.5-1.3 厘米。雄蕊雌蕊群超过 300 个，分 6 或 7 圈，长 3-3.5 厘米，被短柔毛，外花丝从基部合生，形成一个短杯状，基部合生 1.3-1.6 厘米。子房近圆形，3室，被绒毛，长0.5厘米，宽0.4厘米；花柱3，离生至基部，长3-3.3厘米，被绒毛。果实球状，被短柔毛，直径3.5-4厘米，3室，每室有1或2颗种子，轴柱败育。种子楔形或半球形，高 1.6-1.9 厘米，宽 1.1-1.4 厘米，无毛。

分布和物候： 该物种发现于河静省武广县武广国家公园的森林中，海拔超过 100 米： 花期：8 月至 9 月；果期：10 月至 11 月： 花期：八月至九月；果期：十月至十一月。

词源： 新种的特称是指发现地点，越南河静省。

世界自然保护联盟红色名录类别： hatinhensis 的原产地估计不到 1 平方公里。尽管进一步搜索了模式产地周围的区域和附近的其他森林，但只发现了另外 8 棵成熟的树木。该物种的已知种群总数少于 50 个，根据标准 D（世界自然保护联盟，2011 年），该物种将被列为 “CR ”物种。

分类学备注： gauchowensis Chang、C. oleifera Abel、C. sasanqua Thunb.和 C. vietnamemsis Huang ex Hu（Gao et al. 所有这些物种都有顶生花朵，无梗，白色；小苞片和萼片不分化，具鸡冠状；子房 3 室；花柱 3-5 枚。因此，本种应归入 Sect. Oleifera。Oleifera Hung T. Chang。表 2 总结了 C. hatinhensis 与 C. gauchowensis、C. oleifera、C. sasanqua 和 C. vietnamemsis 的主要区别。

 越南。河静省，武广地区