Section：Archecamellia
Conservation Status：Data Deficient
Remarks：This name is accepted
References：
Camellia megasepala Hung T.Chang & Trin Ninh Acta Sci. Nat. Univ. Sunyatseni 35: 79 (1996) Accepted Name
Camellia megasepala 桐野秋豊 (2013). いのくち椿館‐原種ツバキ図鑑. ｐ.94 Cited Name
Camellia megasepala Hung T.Chang & Trin Ninh Nguyễn, H.H. (2017). Thực Vật Chí Việt Nam. Flora of Vietnam 19: 181-182. Nhà xuất bản khoa học và kỹ thuật, Hà Nội. Cited Name
Trà đài lớn Nguyễn, H.H. (2017). Thực Vật Chí Việt Nam. Flora of Vietnam 19: 181-182. Nhà xuất bản khoa học và kỹ thuật, Hà Nội. Vietnamese Name. Vietnamese Name
Camellia megasepala Rivers, M.C. 2020. Camellia megasepala (amended version of 2018 assessment). The IUCN Red List of Threatened Species 2020: e.T191432A177470144. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T191432A177470144.en. Accessed on 22 April 2025. Cited Name [PDF]
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» Description
Camellia megasepala Hung T.Chang & Trin Ninh. First published in Acta Sci. Nat. Univ. Sunyatseni 35: 79 (1996).
The specimen was first discovered by Nguyen Quoc Binh in 1993 in Northern Vietnam. In 1996, Tran Ninh and Chang Hung Ta first published in the journal Acta Scientiarum Naturalium Universitatis Sunyatseni under the scientific name Camellia megasepala H. T. Chang & Tran Ninh ex H. T. Chang. The Vietnamese name is Tra Dai Dai, according to the characteristics of the large calyx (Sepal).
Tree, 5-7 m high; young branches densely hairy. Leaves stalked; petioles 6-8 mm long, pubescent; blades obovate or elliptic, 20-27.5 cm long and 9.5-11.5 cm wide, tomentose below, base cordate, caudate 1-2.5 cm long at the apex, margins densely and sharply denticulate, sometime undulate; lateral veins 11-13 pairs. Flowers yellow, 10-11 cm in diameter, terminal; bracteoles 6-8; sepals 5 (6); petals 11,pubescent on both sides; androecium numerous, 3.5-4 cm long, pubescent; gynoecium hairy, ovary 3, style 3, free to the base. Fruits and seeds not seen. Blooming season: Winter to Spring. Distribution: Na Hang, Tuyen Quang province; Ba Be National Park, Bac Can Province. Endemic species to Vietnam.
Camellia megasepala has most recently been assessed for The IUCN Red List of Threatened Species in 2015. Camellia megasepala is listed as Data Deficient.
» Distribution
Northern Vietnam
» Description
大花萼山茶 Camellia megasepala Hung T.Chang & Trin Ninh in Acta Sci. Nat. Univ. Sunyatseni 35: 79 (1996).
该标本由 Nguyen Quoc Binh 于 1993 年在越南北部首次发现。1996 年，Tran Ninh 和 Chang Hung Ta 首次在《中山大学学报-自然科学版》杂志上发表了该植物的学名 Camellia megasepala H. T. Chang & Tran Ninh ex H. T. Chang。根据大花萼（萼片）的特征，越南名称为 Tra Dai Dai。
乔木，高5-7米；幼枝密被绒毛。叶有柄；叶柄长6-8毫米，被短柔毛；叶片倒卵形或椭圆形，长20-27.5厘米，宽9.5-11.5厘米，下面被绒毛，基部心形，先端尾状长1-2.5厘米，边缘密生锐小齿，有时波状；侧脉11-13对。花黄色，直径10-11厘米，顶生；小苞片6-8；萼片5（6）；花瓣11，两面被短柔毛；雄蕊群多数，长3.5-4厘米，被短柔毛；雌蕊群有毛，子房3，花柱3，离生至基部。未见果实和种子。开花季节： 冬季至春季。分布：越南 Tuyen Quang省Na Hang；Bac Can省Ba Be国家公园。越南特有物种。
大花萼山茶最近一次于 2015年进行了IUCN濒危等级评估，被评为数据缺乏 Data Deficient（DD）。
» Distribution
越南北部
Species in the Same Section: 越南抱茎茶 Camellia amplexicaulis (Pitard) Coh. Stuart.、大苞山茶 Camellia granthamiana Sealy、大白山茶 Camellia albogigas Hu、肋果山茶 Camellia pleurocarpa (Gagnep.) Sealy、麦安山茶 Camellia maianhii Curry, VD Luong & ND Do、普候山茶 Camellia puhoatensis N.S.Lý, V.D.Luong, T.H.Lê, D.H.Nguyễn & N.D.Do、普康金花茶 Camellia pukhangensis N.D.Do, V.D.Luong, S.T.Hoang & T.H.Lê、文朗山茶 Camellia vanlangensis V.D.Luong & V.T.Pham、白抱茎山茶 Camellia lucii Orel & Curry、肖抱茎山茶 Camellia ingens Orel & Curry、拟抱茎山茶 Camellia scabrosa Orel & Curry、梨果抱茎山茶 Camellia pyriparva Orel & Curry、柱蕊茶 Camellia cylindracea T.L.Ming、长叶山茶 Camellia calcicola T.L.Ming、玉玄山茶 Camellia ngochuyeniae V. D. Luong & N. B. Trinh、平元山茶 Camellia nguyenii V. D. Luong & N. D. Do
