25. Aristolochia thwaitesii J. D. Hooker, Bot. Mag. 82: t. 4918. 1856.
海边马兜铃 hai bian ma dou ling
Subshrubs erect. Stems terete to angled, villous, with condensed nodes. Petiole ca. 1 cm, villous; leaf blade spatulate, narrowly oblanceolate, or oblong-oblanceolate, 10-15 × 2.5-3 cm, leathery, abaxially densely brown villous, adaxially glabrate, veins palmate, 12-16 pairs from base, base attenuate to subcuneate, apex acute to shortly acuminate. Racemes from woody base of plant, 3-7-flowered, 4-8 cm. Pedicel ca. 3 cm, recurved, villous; bractlets lanceolate, ca. 5 × 2 mm. Calyx yellow-green; tube geniculately curved, abaxially densely brown villous; basal portion of tube 15-25 × 5-10 mm; limb subcylindric to conic, symmetric, 1.5-3 cm in diam., 5- or 6-dentate. Anthers oblong, ca. 2 mm. Gynostemium 3-lobed. Capsule ovoid-globose, 3-5 × 2-2.5 cm, dehiscing basipetally. Seeds ovoid, ca. 4 × 3 mm. Fl. Apr-May, fr. Aug-Sep.
* Thickets, bamboo forests, on mountain slopes, rock fissures. Guangdong (Hong Kong, Zhuhai).