A phenetic study of Cassia sensu lato (Leguminosae-Caesalpinioideae: Cassieae: Cassiinae) in Thailand

Cassia L. sensu lato, a large heterogeneous genus of flowering plants, occurs naturally in the tropics around the world. Recent works based on floral morphology have supported a division of this genus into three genera, namely Cassia L. s. str., Chamaecrista Moench and Senna Mill. In order to investigate this new classification, 508 specimens of 18 taxa of the genus Cassia s.l. grown in Thailand were analyzed using cluster analysis and canonical discriminant analysis. The total 32 vegetative and reproductive morphological characters were employed in these analyses. In cluster analysis, Cassia s.l. can be separated into four groups, respectively viz. Chamaecrista, Senna alata, Senna and Cassia s /str. The four-cluster grouping is discussed. From a canonical discriminant analysis using the four-cluster grouping as a priori groups, it can be concluded that Cassia s. str., Senna, and Chamaecrista are indeed distinct taxa. The three most important characters that separate the three genera are filament length, fruit length, and ovary stalk length. These quantitative characters, together with some qualitative characters, were useful in constructing an identification key to these genera. Among the three genera, it was also found that Senna is rather a heterogeneous taxon. The difference between the studied species was discussed.     

Notes on the genus Bauhinia (Leguminosae-Caesalpinioideae) in SE Asia

During the revision of the genus Bauhinia for Flora Malesiana three undescribed species have been discovered, Bauhinia kostermansii sp. nov. and B. steenisii sp. nov. from Borneo, and B. franckii sp. nov. from the Malay Peninsula. Bauhinia chrysophylla has turned out to be a later homonym, for which reason Bauhinia aureifolia nom. nov. is proposed. The chromosome number of this species has been counted as 2n = 26. B. fabrilis comb, et stat. nov. is proposed for Phanera riedelii var. fabrilis.     

Revision of Dicorynia (Cassieae,Caesalpiniaceae)

A combined taxonomic revision and wood anatomical study ofDicorynia, a South American genus of legumes that is unusual in both its floral and wood anatomy, is presented. Two possible evolutionary pathways leading to the unique 8-to 10-thecate anthers are discussed, and it is concluded that apical proliferation of the thecal primordia is the more likely. Gross and microscopic features of this silica-accumulating wood are given in detail and contrasted with other legume woods especially those containing silica. Economic uses of the trees, especially the wood ofD. guianensis, are discussed particularly in regard to marine construction. It is suggested that the high resistance of this wood to marine borers lies not so much in its silica content as to the presence of some other chemical. Based on the similarity of floral and fruit structures, the number of species is reduced from 7 to 2:D. guianensis in the Guianas andD. paraensis in the Amazonian region. Vegetative variations in the Amazonian population, previously given species rank, are reduced to 5 new varieties ofD. paraensis.     

New taxa and nomenclatural combinations in Malesian Bauhinia (Leguminosae-Caesalpinioideae)

The following new taxa have been described Bauhinia foraminifera var. falcata var. nov., B. kockiana var. angustifolia var. nov., B. kockiana var. bakoensis var. nov., B. kockiana var. beccarii var. nov., B. kockiana var. brevipedicellata var. nov., B. kockiana var. calcicola var. nov., B. merrilliana var. borneensis var. nov., B. pachyphylla var. wenzelii var. nov., B. semibifida var. acuminata var. nov., B. semibifida var. bruneiana var. nov., B. semibifida var. longebracfeata var. nov., B. stipularis var. brachystylus var. nov., B. wrayi var. blumeana var. nov., and B. wrayi var. borneensis var. nov.
The following new combinations have been made: Bauhinia ahemiana var. subglabra comb. nov., B. ampla var. schlechteri stat. nov., B. bidentata var. breviflora stat. nov., B. bidentata var. fraseri comb. nov., B. bidentata var. gracilipes stat. nov., B. bidentata var. monticola stat. nov., B. fabrilis comb. & stat. nov., B. finlaysoniana var. amoena comb. nov., B. finlaysoniana var. leptopus comb. nov., B. finlaysoniana var. montana comb. nov., B. integrifolia ssp. integrifolia var. nymphaeifolia comb. nov., B. kockiana var. scarlatina stat. nov., B. kockiana var. sericeinervia comb. nov., B. kockiana var. velutina comb. nov., B. lingua var. antipolana stat. nov., B. lingua var. riedelii stat. nov., B. semibifida var. perkinsae stat. nov., B. semibifda var. stenostachya comb, nov., B. wrayi var. cancellata comb. & stat. nov., B. wrayi var. cardiophylla comb, nov., and B. wrayi var. rubella comb. nov.     

A new species of Zenkerella (Leguminosae-Caesalpinioideae) from Tanzania

Zenkerella perplexa sp. nov. from the Uluguru Mts in Tanzania is described and illustrated. Differences between this species and Z. egregia are pointed out.     

Post-zygotic reproductive isolation between sympatric taxa in the Chamaecrista desvauxii complex (Leguminosae-Caesalpinioideae)

BACKGROUND AND AIMS: Differences in the mating systems and the mechanisms of reproductive isolation between Chamaecrista desvauxii var. graminea and C. desvauxii var. latistipula were examined in the Chapada Diamantina, Brazil. These taxa occur sympatrically, and their populations demonstrate marked morphological differences. The objective of the present work was to determine if reproductive isolation mechanisms exist between these two populations of C. desvauxii, and to determine the influence of these putative mechanisms on their genetic differentiation. METHODS: Field observations were made of floral biology, phenology and floral visitation, and experiments on intra- and interpopulation pollination and germination rates of the resultant seeds were performed. A genetic examination of the populations was undertaken using four allozyme loci. KEY RESULTS: The varieties examined demonstrated overlapping of flowering periods during the months of June to September. The main pollinator for both varieties was the bee Bombus brevivillus. Both varieties are self-compatible, and a large number of fruits are formed in cross-pollinations with high seed germination rates. Inter-taxa pollinations result in high levels of fruit production, but no seeds are formed. Two of the four loci examined were diagnostic for the varieties, and exclusive high-frequency alleles were encountered at the other loci, leading to a high genetic distance between the two populations (0.495). CONCLUSIONS: Pre-zygotic barriers were not found between the two varieties, and these remain isolated due to post-zygotic events. The two varieties demonstrate marked differences in their morphology, floral biology, phenology and genetic make-up, all of which indicate that they should be treated as two distinct species. A complete revision involving the other varieties of the C. desvauxii complex will be necessary in order to define these two taxa formally.     

The varieties of Bauhinia pottsii G. Don in Thailand (Leguminosae-Caesalpinioideae)

 Bauhinia pottsii G. Don, B. subsessilis Craib, B. velutina (Wall. ex Benth.) Baker, B. mollissima (Wall.) Prain, and B. decipiens Craib were recently recognized as five varieties of Bauhinia pottsii G. Don. They grow naturally in southern Myanmar, Thailand, Indochina and the Malay Peninsula. Bauhinia pottsii var. decipiens (Craib) K. Larsen & S. S. Larsen is endemic to Thailand and known only from the type collection, so it was omitted from this study. Quantitative and qualitative morphological characters were examined in 200 specimens using multivariate and univariate analyses to determine the taxonomic relationship among the four. Some variation in qualitative characters was found between the varieties which separated them as previously defined in Flora of Thailand. Forty-three quantitative characters were subjected to cluster analysis to allow an objective classification into groups. The groups were subsequently evaluated by a canonical discriminant analysis. It was found that these characters collectively support the four varieties as defined by qualitative characters. However, the close relationship of varieties mollissima (Wall. ex Prain) K. Larsen & S. S. Larsen and velutina (Wall. ex Benth.) K. Larsen & S. S. Larsen is observed. The linear discriminant function has an overall rate of 98.5% correct classification and is useful for variety classification. Among quantitative characters, petal-claw length and ovarystalk length together with some qualitative characters are useful for key construction to separate the four varieties. Received April 24, 2001 Accepted December 11, 2001     

IUPAC-IUB joint commission on biochemical nomenclature (JCBN) nomenclature of glycolipids recommendations 1997

1999.     

Infrageneric nomenclature in Acer (Aceraceae)

Acer sect. and ser.Macrophylla were not validly published until 1962 by Momotani.Acer sect. and ser.Spicata Pax are synonyms of sect. and ser.Acer respectively since they include the generic lectotype;Acer sect.Parviflora Koidz. and ser.Caudata Pax are adopted here for the taxa which includeAcer spicatum Lam. and its close relatives.Acer sect.Integrifolia Pax becomes a synonym of sect.Palmata following the lectotypification of Fang, not Murray; sect. Oblonga (Hu & Cheng) Delendick is proposed as a new combination to replace sect.Integrifolia sensu Murray.     

Bauhinia leucantha sp. nov. (Leguminosae-Caesalpinioideae) and notes on B. ellenbeckii

Bauhinia leucantha sp. nov. is described from central Somalia. The new species is related particularly to B. ellenbeckii in Ethiopia and Somalia, B. teitensis in Kenya, and B. natalensis in eastern South Africa. B. somalensis is reduced to a synonym of B. ellenbeckii and the distribution of this species is shown to extend to northern Somalia.     

世界菌物新命名发表概况(2021年)

21世纪以来, 菌物新物种的发现速度逐渐加快。每个新发表的菌物新名称都蕴含着大量的分类学和多样性信息, 通过对这些信息进行统计和分析, 可以揭示菌物分类学的发展趋势和存在的问题。2021年全球共发表了3,734个菌物新名称, 包括288个新高阶分类单元(1个新门、2个新纲及新亚纲、16个新目及新亚目、36个新科、233个新属及次级属下单元)、2,551个新种及种下单元、782个新组合、113个其他新名称。这些新名称隶属于3界13门40纲159目425科1,165属, 伞菌和小型子囊菌是本年度最受关注的类群。全球有2,060位学者参与了菌物新名称的研究与发表工作, 为历史上命名作者数量最多的一年。中国学者在本年度的菌物新命名工作中做出了突出贡献, 约30%的新名称(1,124个)由中国学者参与发表。来自中国的命名作者共有380位, 是我国命名作者数量最多的一年。本年度发现的2,533个菌物新物种来自于世界7个大洲的101个国家和地区, 新物种丰富度最多的地区是亚洲东部和南部, 而中国发现了756个菌物新物种, 是发现新物种最多的国家, 占全球的近30%。我国南方地区的新物种数量远多于北方地区, 发现新物种最多的省份是云南省, 共发现248种, 占全国的33%。总体来看, 全球菌物新物种发现的速度与近年持平, 处于波动上升的趋势, 而中国的菌物分类学发展速度和贡献度仍在快速提升。建议未来的分类学研究工作中, 继续扩大研究地域和类群, 将新物种发现与完善高阶分类系统并重, 逐步揭示全球菌物多样性本底。     

Revisiting the nomenclature of Psychotria filipes (Rubiaceae)

Psychotria waasii Sohmer, a replacement name for the later homonym Psychotria filipes Hook.f., has been found illegitimate because of being superfluous when published. The new combination Psychotria josephi (Kuntze) Kottaim. is proposed based on the earliest available name Uragoga josephi Kuntze.     

Self-compatible sympatric Chamaecrista (Leguminosae-Caesalpinioideae) species present different interspecific isolation mechanisms depending on their phylogenetic proximity

The mating system of seven sympatric taxa of Chamaecrista occurring in the Chapada Diamantina Mountains, northeastern Brazil, was studied to determine the occurrence of self-incompatibility and interspecific genetic isolation mechanisms within the group. Self- and cross-pollination experiments and inter-taxon bidirectional crosses were performed. All of the populations were self-compatible and showed high percentages of spontaneous seed abortion on both self- and cross-pollinated fruits. The inter-incompatibility among the taxa of Chamaecrista is directed by different mechanisms depending on their degrees of phylogenetic proximity. In the crosses between closely related taxa (same clade), seed inviability was observed in the crossing pairs C. desvauxii var. graminea × C. desvauxii var. latistipula, and C. chapadae × C. glaucofilix. Inter-compatibility between species of the same clade occurred in C. blanchetii and C. confertiformis, with the formation of viable seeds. Pre-zygotic gametophytic reproductive isolation was observed among taxa of different clades, without penetration of the pollen tube into the ovule, or post-zygotic isolation through embryo or endosperm inviability, with abortion of the seeds. Inter-incompatibility represents an important factor in reproductive isolation and thus in the maintenance of the genetic identity of sympatric taxa that flower in synchrony and share pollinators.