普候山茶 Camellia puhoatensis N.S.Lý, V.D.Luong, T.H.Lê, D.H.Nguyễn & N.D.DoCamellia puhoatensis

Camellia puhoatensis N.S.Lý, V.D.Luong, T.H.Lê, D.H.Nguyễn & N.D.Do. First published in PhytoKeys 153: 3 (2020).

The specimen was discovered by Do Ngoc Dai, Le Thi Huong, Nguyen Danh Hung in 2018 in Pu Hoat Nature Reserve, Que Phong district, Nghe An province. In 2020, the group of authors Nguyen Danh Hung, Luong Van Dung, Le Thi Huong, Tran Quoc Thanh, Do Ngoc Dai and Ly Ngoc Sam published in the journal PhytoKeys with the scientific name Camellia puhoatensis. The Vietnamese name is Tra Pu Hoat, bearing the name of the Pu Hoat conservation area, where the specimen was first discovered.

Diagnosis. Camellia puhoatensis is morphologically similar to C. chrysanthoides, C. flavida and C. petelotii, but differs in having young puberulous shoots, mature leaves sparsely puberulous abaxially with leaf bases rounded or broadly obtuse, petioles and pedicels puberulous, tepals 12–13 and the ovary and styles pubescent.

Type. VIETNAM. Nghe An Province: Que Phong District, Dong Van Commune, Pu Hoat NR, 19°43'31"N, 105°05'43"E, 270 m elev., 30 December 2018, Do Ngoc Dai, Le Thi Huong, Nguyen Danh Hung, DHH682 (holotype VNM; isotypes P, DLU). 

Phenology. Flowering from November to January of the next year.

Distribution and Habitat. Camellia puhoatensis is currently found only from the type locality. It grows on moist fertile and sandy soils along mountain streams and hill slopes in evergreen broad-leaved forests in Pu Hoat Nature Reserve, Vietnam, at elevations of 270–450 m.

Provisional Conservation Assessment. At present, only a single population of about 300 scattered mature individuals of Camellia puhoatensis was observed in the type locality, with an estimated extent of occurrence (EOO) less than 100 km and an area of occupancy (AOO) less than 1 km². The population is highly threatened due to loss of habitat within its range and high market demands for wild, yellow-flowered camellias which are intensively collected for sale by local people. Therefore, C. puhoatensis is preliminarily categorised as Critically Endangered [B1ab (i, ii, iii) + 2ab (ii, iii), D], according to the IUCN Categories and Criteria (IUCN 2017).

Etymology. The specify epithet ‘puhoatensis’ refers to the type locality.

Uses. Leaves and flowers were harvested and used for tea by the local people.

Paratypes. Vietnam. Nghe An Province: Que Phong District, Dong Van Commune, Pù Hoạt NR, 19°48'45"N, 105°5'39"E, 320 m elev., 2 September 2018, Đỗ Ngọc Đài, Nguyễn Danh Hùng, Lê Thị Hương, DHH 120 (VNM); the same locality, 19°48'31"N, 105°05'43"E, 280 m elev., 16 January 2019, Đỗ Ngọc Đài, Nguyễn Danh Hùng, Lê Thị Hương, DHH 790 (DLU), DHH 791 (HN).

Vernacular name. Vietnamese language: Trà hoa vàng pù hoạt.

VIETNAM: Pu Hoat Nature Reserve, Que Phong district, Nghe An province

该标本由 Do Ngoc Dai、Le Thi Huong、Nguyen Danh Hung 于 2018 年在义安省 Que Phong 县 Pu Hoat 自然保护区发现。2020 年，由 Nguyen Danh Hung、Luong Van Dung、Le Thi Huong、Tran Quoc Thanh、Do Ngoc Dai 和 Ly Ngoc Sam 组成的作者小组在《PhytoKeys》杂志上发表了学名为 Camellia puhoatensis 的文章。越南语名称为 Tra Pu Hoat，与首次发现该标本的 Pu Hoat 保护区同名。

普候山茶（Camellia puhoatensis）在形态上与 C. chrysanthoides、C. flavida 和 C. petelotii 相似，但不同之处在于幼芽被微柔毛，成熟叶片背面疏生微柔毛，叶基部圆形或宽钝，叶柄和花梗被微柔毛，花被片 12-13 以及子房和花柱被短柔毛。

越南义安省 Que Phong 县 Pu Hoat 自然保护区