Acacia sousae (Leguminosae: Mimosoideae) a new species from Mexico

A new species,Acacia sousae, from the states of Guerrero and Puebla is described and illustrated. A key for determination of the related species is given.     

Zapoteca quichoi (Leguminosae, Mimosoideae), a new species from southeastern Mexico

Zapoteca quichoi, a new species endemic to southern Tabasco, Mexico, is described and illustrated. This species exhibits morphological characteristics that place it within subgenus Amazonica, together with Z. amazonica and Z. microcephala, from Peru and Colombia, respectively.

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Resumen  Se describe e ilustra Zapoteca quichoi (Leguminosae, Mimosoideae), una nueva especie de Tabasco, México. Esta especie exhibe características morfológicas que la ubican dentro del subgénero Amazonica, junto con Z. amazonica y Z. microcephala, especies nativas de Perú y Colombia respectivamente.

     

Calliandra anthoniae (Leguminosae,Mimosoideae, Ingeae), a new species,and a new combination in Pseudopiptadenia Rauschert (Leguminosae,Mimosoideae, Mimoseae)

Calliandra anthoniae is described and illustrated, and the combinationPseudopiptadenia suaveolens is made.     

Calliandra dolichopoda and C. cualensis (Leguminosae, Mimosoideae), two new species from Mexico

Calliandra dolichopoda and C. cualensis, two species endemic to Guerrero and Jalisco, Mexico, respectively, are described and illustrated. Both species appear to be closely related to C. hirsuta.

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Resumen  Se describen e ilustran Calliandra dolichopoda y C. cualensis, dos especies endémicas de Guerrero y Jalisco, México, respectivamente. Ambas especies parecen estar relacionadas con C. hirsuta.

     

A new species of Mimosa sect. Mimosa (Leguminosae, Mimosoideae) from Southern Brazil

A new species of Mimosa section Mimosa, Mimosa eurystegia, which is apparently endemic to Paraná in southern Brazil, is described and illustrated. This species is distinguished by plurinerved leaflets and papyraceous, plurinerved, orbicular, amplexicaul stipules. Morphological distinctiveness of this new Mimosa and its relationships with allied species are discussed. Phenological, geographical and ecological data are presented, in addition to a key to the species of Mimosa subser. Sparsae.     

Two new species of Acacia (Leguminosae–Mimosoideae) from Ethiopia and Yemen

Two new species of Acacia belonging to subgenus Acacia, A. origena from the high lands of N Ethiopia and Yemen and A. prasinata from the Rift Valley in central Ethiopia are described. The external morphology of the latter species is shortly described.     

Two new species of Acacia (Leguminosae) from north-eastern Somalia

Acacia qandalensis , sp. nov., and A. tephrophylla , sp. nov., from north-eastern Somalia, are described and illustrated. A. qandalensis grows on limestone rocks, often in steep and exposed places, and is known from 600–1400 m altitude from the Cal Miskaat Mts in the west to near Bunder Murrayha in the east. A. tephropkylla obviously has a more restricted area of distribution and is known only from stony or rocky places on limestone at 1300–1800 m altitude in the Cal Miskaat Mts, where it is the dominant woody plant over large areas. Both species are related to A. etbaica.     

Genista valsecchiae (Leguminosae), a new species from Sardinia

Genista valsecchiae from SW Sardinia is described and illustrated as a species new to science. It is very similar toG. ephedroides and can be distinguished by morphological differences of habit and inflorescence. It typically occurs in the garigue or maquis and is widespread in SW Sardinia.     

Three new species of Parkia (Leguminosae: Mimosoideae) from tropical South America

Parkia cachimboensis andP. bahiae are described from central and eastern Brazil respectively. The third new species,P. panurensis, which is widespread in central and western Amazonia, has passed hitherto under the incorrect nameP. pectinata (Willd.) Benth.     

Acacia ochracea (Leguminosae-Mimosoideae), a new species from Somalia

Acacia ochracea , a new species in the A. Senegal complex, is described and illustrated. It is a common and conspicuous tree over large areas in the western Bay Region and in the Gedo Region in SW Somalia.     

A new species of Acacia (Leguminosae) from the Horn of Africa

Acacia cernua , sp. nov., is described from open Acacia-Commiphora bushland on the foothills of the north-facing limestone escarpment running along the coast of northern Somalia. The new species is obviously closely related to the widespread A. etbaica that is common on this escarpment, but at considerably higher altitudes. A. cernua differs from A. etbaica in, for example, its smooth, ash grey to white bark, and in its slender, hanging terminal branches with a glaucous foliage.     

Excessive sulphur accumulation and ionic storage behaviour identified in species of Acacia (Leguminosae: Mimosoideae)

Background and Aims Thiophores, which are typically desert gypsophytes, accumulate high (2–6 % S dry weight) sulphur concentrations and may possess unique tolerance to environmental stress factors, e.g. sulphate/metal toxicity, drought and salinity. Little is known of the prevalence of the behaviour or the associated physiological aspects. The aim of this study was to (a) determine the prevalence of thiophore behaviour in a group of Australian xerophytes; (b) identify elemental uptake/storage characteristics of these thiophores; and (c) determine whether the behaviour is constitutive or environmental.Methods The elemental composition of soils and the foliage of 11 species (seven genera) at a site in the Tanami Desert (NT, Australia) was compared and 13 additional Acacia species from other locations were examined for elevated calcium and sulphur concentrations and calcium–sulphur mineralization, thought to be particular to thiophores.Key ResultsAcacia bivenosa DC. and 11 closely related species were identified as thiophores that can accumulate high levels of sulphur (up to 3·2 %) and calcium (up to 6.8 %), but no thiophores were identified in other genera occupying the same habitat. This behaviour was observed in several populations from diverse habitats, from samples collected over three decades. It was also observed that these thiophores featured gypsum (CaSO₄·2H₂O) crystal druses that completely filled cells and vascular systems in their dried phyllode tissues.Conclusions The thiophores studied exhibit a tight coupling between sulphur and calcium uptake and storage, and apparently store these elements as inorganic salts within the cells of their foliage. Thiophore behaviour is a constitutive trait shared by closely related Acacia but is not highly prevalent within, nor exclusive to, xerophytes. Several of the newly identified thiophores occupy coastal or riparian habitats, suggesting that the evolutionary and ecophysiological explanations for this trait do not lie solely in adaptation to arid conditions or gypsiferous soils.     

广西半蒴苣苔属(苦苣苔科)一新变种——翅茎半蒴苣苔

记载了广西苦苣苔科一新变种——翅茎半蒴苣苔Hemiboea subcapitata Clarke var. pterocaulis Z. Y. Li。该变种与原变种不同在于茎具翅,花期较早。     

Hemiboea subcapitata var. pterocaulis (Gesneriaceae), a new variety from Guangxi,China

AbstractHemiboea subcapitata Clarke var. pterocaulis Z. Y. Li, a new variety of the Gesneriaceae from Guangxi, China, is described. The variety is different from the typical one by having winged stem and earlier flowering period.     

Thalictrum fortunei var. bulbiliferum (Ranunculaceae), a new variety from Jiangsu,China

Thalictrum fortunei S. Moore var. bulbiliferum B. Chen & X. J. Tian, a new variety of the Ranunculaceae from Jurong County, Jiangsu Province, China, is described and illustrated. It is different from the typical variety, var. fortunei, by having bulbils in axils of most of the cauline leaves after anthesis.     

乐山秤锤树——四川秤锤树属(安息香科)一新变种

秤锤树属(安息香科)一新变种--乐山秤锤树(Sinojackia xylocarpa Hu var. leshanensis L. Q. Luo)在中国四川被发现。     

Rhododendron longesquamatum var. glabristylum (Ericaceae), a new variety from Sichuan,China

Rhododendron longesquamatum var. glabristylum Y. Y. Geng et Z. L. Zhao , a new variety of the Ericaceae from Sichuan, China, is described and illustrat ed. This variety is different from the typical one by having smaller leaves (5～8×2～3.5 cm) and smalle