Vasilis Teodoridis:
Rubiaceae 8. Uncaria rhynchophylla (Miq.) Miq. ex Havil. in Journ. Linn. Soc. Bot. 33: 890. 1897
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Nauclea rhynchophylla Miq. in Ann. Mus. Bot. Lugd. Bat. 3: 108. 1867; Ourouparia rhynchophylla (Miq.) Matsum.; Uncaria rhynchophylla var. Koutong Yamazaki.
Lianas; young stems slender; square or slightly 4-angled; glabrous. Petioles 5--15 mm long; glabrous; leaf blade elliptic or elliptic-oblong; 5--12 x 3--7 cm; papery; glabrous on both surface; when dry brown or reddish brown; sometimes glaucous abaxially; lateral veins 4--8 pairs; domatia with colleters; stipules narrowly triangular; deeply bifid to 2/3 of length; abaxially glabrous; adaxially glabrous or with colleters at base; lobes linear to triangular-lanceolate. Flowering heads across calyces 5--8 mm in diameter; solitary in axils; peduncle with one node; bracts minute; or in single cymose; peduncle axillary; 5 cm long. Bracteoles linear or linear-spathulate. Flowers subsessile. Calyx tube sparsely hairy; lobes subtriangular; 0.5 mm long; sparsely pubescent; apex acute. Corolla tube glabrous scattered hairy abaxially; lobes ovate; abaxially glabrous or slightly farinose/mealy pubescent; margin sometimes ciliate. Style exserted; stigma clavate. Fruiting head 10--12 mm in diameter; fruitlets 5--6 mm; pubescent; persistent calyx lobes subtriangular; 1 mm long; stellate radiate. Fl. and fr. May--Dec.
Sparse forests or thickets at strem sides in valleys. Guangdong; Guangxi; Yunnan; Guizhou; Fujian; Hunan; Hubei; Jiangxi [Japan].