河口超长柄茶 Camellia hekouensis C.J.Wang & G.S.FanCamellia hekouensis

Camellia hekouensis C. J. Wang & G. S. Fan in Acta Bot. Yunnan. 10: 365-366 (1988)

Shrubs or trees, 3-4.5 m tall. Year-old branchlets purplish brown; current year branchlets green, glabrous. Petiole 6-10 mm, glabrous; leaf blade oblong to oblong-lanceolate, 16-25 × 3.5-7 cm, thinly leathery, abaxially pale green and becoming pale brown when dry, adaxially dark green, both surfaces glabrous, midvein raised, secondary veins 13-18 on each side of midvein and raised on both surfaces, reticulate veins slightly raised or obscure on both surfaces, base broadly cuneate to rounded, margin serrulate, apex abruptly shortly caudate to long caudate. Flowers axillary, solitary or to 3 in a cluster. Pedicel 2.5-3.5 cm, slender, glabrous; bracteoles 3, persistent, ovate, ca. l mm, glabrous. Sepals 5, broadly ovate to suborbicular, 3-5 × 3-4 mm, glabrous, margin ciliolate. Petals 7, white, nearly distinct, obovate to obovate-elliptic, 7-10 × 6-7 mm, glabrous. Stamens ca. 7 mm, glabrous; outer filament whorl basally connate for ca. 1 mm. Ovary ovoid, ca. 1.5 mm in diam., densely pale yellow tomentose, 3-loculed; style ca. 5 mm, 3-parted to near base, base pubescent or glabrous. Capsule not seen. Fl. Nov-Dec.

● Forests on hilly slopes or in valleys; 300-500 m. SE Yunnan (Hekou).

Camellia hekouensis has most recently been assessed for The IUCN Red List of Threatened Species in 2015. Camellia hekouensis is listed as Critically Endangered under criteria B1ab(iii).

河口超长柄茶 Camellia hekouensis Wang et Fan in Acta Bot. Yunnan. 7 (3): 365-366. 1988. 高继银、帕克斯、杜跃强，2005. 《山茶属植物主要原种彩色图集》浙江科学技术出版社，第164页。

小乔木，嫩枝无毛。叶薄革质，长圆形，长16-25厘米，宽3.5-6.5厘米，先端急锐尖，基部阔楔形或近圆形，上下两面均无毛，侧脉14-18对，与中肋作45°锐角开出，在叶面干后略下陷，网脉不明显，边缘有细锯齿，叶柄长约1厘米。花白色，1-3朵腋生，花柄长2.5-3.5厘米，纤细，无毛；苞片3片，在花柄上互生；萼片5，阔卵形或近圆形，长3-5毫米，无毛；花瓣7片，离生，倒卵形，长7-10毫米，无毛；雄蕊长5-7毫米，离生；子房3室，花柱3条，长3-5毫米。蒴果未见。

模式标本采自云南河口，海拔350米的常绿林中。

河口超长柄茶最近一次于 2015年进行了IUCN濒危等级评估，被评为极危 Critically Endangered（CR）。