Aristolochia kechangensis Y. D. Peng & L.Y. Yu, a new species from northwestern Guangxi, China, is described and illustrated. Based on morphology, the species is referred to Aristolochia subg. Isotrema. The species is similar to A. kwangsiensis and is found in karstic limestone habitats, with ovate‐rounded to heart‐shaped blades and 1–4‐flowered racemose inflorescences, but differs from the latter by a heart‐shaped (versus rounded) blade base, yellow‐green limbs with densely brown nervules (versus red to purple limbs with tuberculate ornamentation), and slender fruit with a diameter of ca 1.5 cm (versus robust fruit with a diameter of ca 2 cm). The leaf epidermis of the new species is characterized by tuberculate protuberances. We present a detailed description, with line drawings, distribution map and color plate, and compare it to related species based on morphological characters. An updated key to Aristolochia distributed in Guangxi region is provided.

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The genus Peliosanthes Andrews (1810: 605) belonging to the family Asparagaceae is represented by more than 70 species in tropical and subtropical Asia (IPNI 2019). In the past 15 years many species have been discovered and described from China, Cambodia, Laos and Vietnam (Tanaka 2004, Tamura et al. 2008, Averyanov & Tanaka 2012, Averyanov et al. 2013, 2015a, 2015b, 2017, Nguyen et al. 2017, Roy et al. 2017, Vislobokov 2016, Vislobokov et al. 2018). In September 2015, we collected plants of Peliosanthes growing in shadow, primary broad-leaved evergreen forests on rocky limestone mountains in southwestern Guangxi, China. They had fasciculate flowers in the axils and hence appears to be closely allied to P. teta Andrews (1810: 605), but after a close study, we found them differ clearly from the former in many significant diagnostic characters. We therefore consider the plants to represent an undescribed species and name them here.

In this note we study scalar and fermion zero modes on the brane arising from two scalar fields. The result is that there exist normalizable massless modes of scalar fields which can be localized on the brane. While, for spin 1/2 and spin 3/2 fermions, the corresponding zero modes are non-normalizable. Thus, some mechanism such as Yukawa coupling should be introduced for the localization of these fermionic fields on the thick brane.