In this paper, Aristolochia involuta and A. hainanensis subsp. yingjiangensis, two new taxa from Yunnan, China, are described and illustrated. The former is similar to A. bambusifolia in the calyx limb, but differs in the flower size and leaf shape. The latter differs from A. hainanensis by its leaf shape, fruit size and distribution. And we also clarify the flower character of Aristolochia obliqua.

A new Alocasia species, Alocasia yunqiana, is described and compared with its morphologically related taxa. The novelty is characterized by an oblong-naviculiform-shaped spathe-limb that is strongly hooded and slightly glaucous to glossy during its entire anthesis, a spadix with a sterile interstice and an appendix that are much shorter and thinner than the staminate zone, as well as the dimorphic synandroidia. Detailed information containing description, colored plates and illustration are provided herein.

A species new to science, Typhonium sagaingense from Sagaing Region, Myanmar, is herein described and illustrated. It is similar to T. albidinervum and T. filiforme but differs in having following characters: trifoliolate leaves, spadix slightly shorter than spathe, fewer yellow staminodes arranged in one whorl and pink appendix. Detailed descriptions, colour plates, illustration, distribution, phenology and ecology of the new species are provided, including a key to all Typhonium occurring in Myanmar.

A new species, Arisaema melanostomum, and a new combination, A. yunnanense subsp. quinquelobatum, are proposed, described and illustrated in this article.

Explaining where plants originated and how plants migrated between eastern Asia and other Northern Hemisphere regions is still challenging. The genus Arisaema is considered a good example to illuminate this process, due to its wide distribution in both the tropical and temperate zones. Based on comprehensive taxon sampling, the historical biogeography of Arisaema was conducted using the molecular data from four chloroplast DNA regions. The phylogeny of Arisaema was studied by using ML and BI methods. Divergence times of Arisaema species were estimated by the uncorrelated lognormal Bayesian method. The ancestral area reconstruction of Arisaema was performed with BioGeoBEARS and Bayes-DIVA. Our results indicated that the crown group of Arisaema originated in Southeast Asia ca. 31.28 Ma. After the initial origin, Arisaema was inferred to have become widespread in Southeast Asia. Members in Himalayas, Africa and North China, Japan, the Korean Peninsula region (NJK region) were derived from migrants originating in Southeast Asia. American members were derived from migrants originating in the NJK region. Arisaema originated in Southeast Asia during the Oligocene with the development of tropical rainforest and a warm, moist climate. During the Oligocene to Miocene, Southeast Asia was the original center for the diversification of Arisaema in the NJK region.

Arisaema longitubum (Araceae), belonging to Arisaema sect. Odorata, is described and illustrated as a new species. The new species is closely related to Arisaema yunnanense, A. bathycoleum, and A. lidaense but differs in a suite of morphological characters useful in species distinction provided in this article.

alocasia odora (Roxb.) k. koch (Araceae) is a species common to tropical Asia and oceania and is a popular ornamental plant in the horticultural industry. it is widely known as "海芋" (hai yu) or "滴水观音" (di shui guan yin) in the Chinese market. The discovery of species of alocasia (Schott) G. Don can be traced back to the Linnean era. As early as Roxburgh's time, a few names (e.g. arum cucullatum lour., arum odorum Roxb., nom. nud., arum fornicatum Roxb., nom. nud. and arum macrorrhizon l.) had been proposed. during a revision of alocasia in China, we noticed that the correct name and typification of alocasia odora and its related nomenclatural entities are unclear in the literature (