Pranom Chantaranothai

New taxa and combinations in Cleistocalyx and Syzygium (Myrtaceae) in Thailand

Fourteen new taxa in Cleistocalyx and Syzygium are described: C. khaoyaiensis, C. phengklaii, S. boisianum subsp. longifolium, S. cacuminis subsp. inthanonense, S. campanulatum var. longistylum, S. craibii, S. grande var. parviflorum, S. gratum var. confertum, S. hemsleyanum subsp. paucinervium, S. ixoroides, S. kerrii, S. lakshnakarae, S. nitrasirirakii and S. praineanum subsp. minor. Four new names are proposed: S. aksornii, S. enervosum, S. maingayi and S. putii, and 35 new combinations established: C. operculatus var. paniala, S. anacardiifolium, S. angkae subsp. angkae and subsp. spissum, S. attenuatum subsp. attenuatum var. montanum and subsp. circumscissum, S. cacuminis, S. cinereum, S. claviflorum var. glandulosum and var. maingayi, S. dyerianum, S. filiforme, S. fuscescens, S. glaucum, S. globiflorum, S. helferi, S. hulletianum, S. jasminifolium, S. laetum subsp. jugorum and subsp. sublaetum, S. myrtillus var. borneense, S. oblatum var. laevicaule, S. pergamentaceum, S. pseudotetrapterum, S. refertum, S. ridleyi, S. rigens, S. samarangense var. parviflorum, S. scortechinii, S. siamense, S. subhorizontale, S. subrufum subsp. smalianum, S. tetrapterum, S. thumra subsp. punctifolium and S. variolosum.

Barringtonia (Lecythidaceae) in Thailand

Summary. Barringtonia J. R. Forst. & G. Forst. in Thailand is revised and 11 species recognised and described; two new species, B. khaoluangensis and B. rimata are described and one species resurrected, namely B. longipes. B. acutangula subsp. spicata is reduced to synonymy. B. augusta, B. conoidea and B. pauciflora have been found new to Malaysia, Vietnam and Borneo (Brunei), respectively. Four lectotypes have been designated. Barringtonia is a genus of 56 species with a wide distribution in the tropics from eastern Africa to northern Australia. The name was first proposed by J. R. Forster & G. Forster in 1776, in honour of Daines Barrington (1727-1800), an English jurist, antiquary and botanist. The most widely occurring species are B. acutangula (L.) Gaertn., B. asiatica (L.) Kurz and B. racemosa (L.) Spreng. About 10 species have been recorded in mainland southeast Asia; two newly described species have distributions restricted to peninsular Thailand. In Thailand the genus Barringtonia is represented by 11 species, most of which are trees or small trees. B. acutangula is the only species which is commonly found all over the country. The others are found mainly in southeastern and peninsular Thailand. They occur in evergreen, deciduous and bamboo forests, along streams, rivers and seashores at all elevations from sea level up to 1,000 m. The genus is attractive, in particular because many species have long, pendulous inflorescences which give the plants a most distinctive appearance. There are few references pertaining to this genus in Thailand and a complete taxonomic revision is needed.

Revisions and key to the Vernonieae (Compositae) of Thailand

Abstract Seventeen genera and 48 species, in five subtribes, are recognized in Thailand. These include 15 endemic taxa, half of which are in the largest genus, Acilepis, with others in the genera Camchaya, Koyamasia, and Okia. A new monotypic genus, Pulicarioidea, is established with P. annamica, the new name for the species formerly known as Vernonia pulicarioides. New combinations are also made for Acilepis kerrii, Cyanthillium montanum, Koyamasia curtisii and Okia pseudobirmanica. Forty-six characters including habit, leaf, flower, achene and pollen morphology were analyzed using UPGMA. Five clusters of taxa were identified. Keys to genera, species and varieties, descriptions, vernacular names, ecological data and illustrations are provided.

Blumea (Compositae: Inuleae) in continental Southeast Asia

SummaryA revision of the genus Blumea DC. in continental Southeast Asia, including Myanmar, Thailand, Laos, Cambodia, Vietnam and Peninsular Malaysia, is presented covering aspects of taxonomic history, key to taxa, synonymy, descriptions, and notes on distribution, ecology and phenology. Blumeopsis is reduced. Twenty-seven species are recognised, one of which is divided into two varieties. The lectotypes of 26 names are designated and three names are resuscitated here: B. flava, B. hamiltonii and B. macrostachya.

Pollen morphology of Justicia L. (Acanthaceae) from Thailand and its taxonomic value

Abstract The acetolysed pollen of 33 species of the genus Justicia in Thailand is investigated using both light and scanning electron microscopy. The pollen of the genus is characterised as being isopolar, bilaterally or radially symmetrical, with mostly prolate or prolate spheroidal shape. Based on characters with high factor loading in the cluster analysis and principal components analysis, the studied species are divided into two major groups; one with 3-colporate with six pseudocolpi and the other with 2-porate or 2–3-colporate with aperture areas. The pollen morphology of each group is described and illustrated. Pollen characters are useful for taxonomic delimitation and relationships among Thai species.

Phylogeny of the genus Zingiber (Zingiberaceae) based on nuclear ITS sequence data

SummaryRelationships among 23 species of Zingiber Mill. were investigated using nuclear ribosomal DNA (ITS1, 5.8S and ITS2) sequences. Phylogenetic analysis of the ITS region has resolved the taxa under study into four clades, which correspond with previously recognised sectional classification of the genus based on inflorescence type (sects Zingiber, Dymczewiczia (Horan.) Benth., Pleuranthesis Benth. and Cryptanthium Horan.). However, sects Zingiber and Dymczewiczia are weakly supported as separate groups and are more closely related to each other than to sects Pleuranthesis and Cryptanthium. Two species, Z. junceum Gagnep. and Z. gramineum Noronha, which were previously tentatively placed in both sects Zingiber and Dymczewiczia due to their ability to develop two inflorescence types, are allied with sect. Zingiber. The close relationship of the two sections based on ITS sequences together with similarity in pollen morphology supports an earlier proposal that sect. Dymczewiczia should be amalgamated with sect. Zingiber. Analysis of ITS sequence data also resolved the species under study into three groups according to geographical distribution.

Palynological studies in the family Melastomataceae from Thailand

The pollen morphology of 86 species belonging to 19 genera of the Melastomataceae in Thailand was examined by both light‐ and scanning electron microscopy. Three pollen groups and five pollen types could be established: Group 1 has one type, Pternandra type, with tricolporate pollen. Group 2 comprises two heterocolpate pollen types with subsidiary colpi, the Anerincleistus and the Diplectria types and Group 3 comprises two heterocolpate pollen types, the Blastus and the Pachycentria types, with intercolpar concavities. A key for the identification of these pollen types as well as the possible phylogenetic trends is presented.

New taxa and new combinations of Eriocaulaceae from Thailand

SummaryEight species, three subspecies, four varieties and three combinations of Eriocaulon L. from Thailand are described, preparatory to a revision of the Eriocaulaceae for the Flora of Thailand.

Pollen morphology of the genus Cornukaempferia （Zingiberaceae） in Thailand

Cornukaempferia is a recently described genus of Zingiberaceae which only occurs in Thailand as a rare genus with limited geographical distribution. Only three species have been described so far, including a recently described new species, C. larsenii. These three species are morphologically very similar and additional data on other biological aspects are useful for the elucidation of their relationship. Pollen morphology of all three species of genus Cornukaempferia has been studied by light microscopy and scanning electron microscopy. The pollen grains are monad, spherical, inaperturate. The exine sculpture is echinate with psilate between the spines for C. aurantiflora and C. longipetiolata, or echinate with regulate between the spines for C. larsenii. This observation helps support the taxonomic status of C. larsenii.

New species and a reinstatement in Peperomia (Piperaceae) from Thailand

SummaryFour new species of Peperomia (Piperaceae) from Thailand, namely P. heptaphylla, P. masuthoniana, P. multisurcula and P. sirindhorniana are described and illustrated. The reinstatement of P. dindygulensis is also proposed with supporting morphological evidence.