- Scientific Name: Platycrater arguta Siebold & Zuccarini
- Ref: Fl. Jap. 1: 64. 1837–. 1838.
- Synonyms: Platycrater arguta var. sinensis
- Chinese Common Name: 蛛网萼 zhu wang e
- Japanese Common Name: バイカアマチャ（ｂａｉｋａａｍａｃｈａ）梅花甘茶
- Family: Saxifragaceae
- Genus: Platycrater
- Distribution: Sparse forests or thickets in valleys, stream banks, mountain slopes; 400-1800 m. Anhui, Fujian, Jiangxi, Zhejiang [Japan].
Shrubs 0.5-3 m tall. Branchlets brown, subglabrous. Petiole 1-7 cm; leaf blade lanceolate to elliptic, 9-15 × 3-6 cm, membranous to papery, both surfaces pubescent or adaxially subglabrous, secondary veins 7-9 on both sides of midvein, slender, abaxially slightly prominent, base narrowly cuneate, slightly decurrent, margin roughly serrate to serrulate. Inflorescence subglabrous; bracts linear. Sterile flowers with sepals 3 or 4, broadly ovate, connate from base to middle and forming a triangle or square 2.5-2.8 cm in diam. in fruit, translucent and thinly net veined. Fertile flowers with calyx tube turbinate, 4-5 mm; teeth 4 or 5, triangular-ovate to narrowly triangular, 4-5.5 mm, to 7 mm in fruit. Petals ovate, ca. 7 mm. Filaments filiform; anthers subglobose, ca. 1 mm in diam. Styles slender, ca. 1 cm in fruit; stigmas small. Capsule 8-9 mm, apically 6-8 mm in diam., striate. Seeds dark brown, compressed ellipsoid, 0.6-0.8 mm, thinly striate, shortly winged. Fl. Jul, fr. Sep-Oct.(Flora of China)