Three species of succulents are recorded as new for the flora of Mt. Mulanje, the highest mountai... more Three species of succulents are recorded as new for the flora of Mt. Mulanje, the highest mountain in south-tropical Africa in the Southern Region of Malawi: The unidentified "Sansevieria sp." in the "Checklist of the Spermatophytes of Mount Mulanje" (Strugnell 2006) is identified as Sansevieria sinus-simiorum (Asparagaceae / Dracaenaceae), as well as Crassula swaziensis and Crassula setulosa (Crassulaceeae) which were already collected on Mt. Mulanje in 1946 and 1979 but the specimens escaped attention until now. Two collections from the Nyika Plateau in the Northern Region of Malawi similar to but clearly different from Crassula setulosa are reported which might represent a new taxon. Zusammenfassung: Drei Arten von Sukkulenten werden als neu für die Flora des Mt. Mulanje, den höchsten Berg im südlichen tropischen Afrika in der Southern Region von Malawi, verzeichnet: Die nicht identifizierte "Sansevieria sp." in der "Checklist of the Spermatophytes of Mount Mulanje" (Strugnell 2006) wird als Sansevieria sinussimiorum (Asparagaceae / Dracaenaceae) identifiziert, und Crassula swaziensis sowie Crassula setulosa (Crassulaceeae), die schon 1946 und 1979 auf dem Mt. Mulanje aufgesammelt wurden, deren Aufsammlungen aber bisher unbemerkt blieben. Zwei Sammlungen vom Nyika Plateau in der Northern Region von Malawi, die Crassula setulosa ähnlich sind, aber deutlich davon abweichen und ein neues Taxon darstellen könnten, werden berichtet.
VALIDATION OF TWO SECTIONAL NAMES IN ERIOSPERMUM Perry's revision of Eriospermum (1994) included ... more VALIDATION OF TWO SECTIONAL NAMES IN ERIOSPERMUM Perry's revision of Eriospermum (1994) included a new infrageneric classification of the genus with new infra generic taxa being formally described. However, two of the new sectional names were invalidly published due to the lack of typification (Art. 37.1 St Louis Code: Greuter et al. 2000). Although this omission was mentioned in the Index kewensisiIK) as available in the CD-Rom version, or with in the International Plant Names Index (IPNI) internet data base, no action has been taken to validate the names. Consequently, both names are validated here:
Perennial or rarely annual or hapaxanthic herbs to (sub)shrubs, rarely aquatics, treelike, epiphy... more Perennial or rarely annual or hapaxanthic herbs to (sub)shrubs, rarely aquatics, treelike, epiphytic or scandent, with ± succulent leaves, sometimes with succulent stems, rhizomes, underground caudices or succulent roots; indumentum of unior multicellular, often glandular hairs, or plants glabrous. Leaves (sub)sessile or rarely petiolate, usually alternate and spiral, or opposite-decussate or rarely whorled, frequently aggregated into rosettes, simple, rarely compound, usually entire or crenate to lobed, rarely dissected, estipulate. Inflorescences usually terminal, bracteate, usually many-flowered, basically thyrsoids, also pleio-, di-or monochasia (cincinni) or rarely true panicles, racemes or spikes. Flowers hermaphrodite, rarely unisexual, actinomorphic or very rarely zygomorphic, usually proterandrous, (3-)5(-32)merous; sepals free or connate at base, sometimes distinctly unequal in size; petals free or connate to a short to long corolla tube; stamens as many as or usually twice as many as petals; filaments free or ± connate with a tubular corolla; anthers basifixed in basal pit, 4-sporangiate, 2-locular at anthesis, dehiscence latrorse or slightly introrse by longitudinal slits; ovary usually ± superior to semi-inferior; carpels as many as petals, usually free or almost so, sessile or sometimes stipitate, tapering gradually to abruptly into short to long, erect to divergent stylodia, basally with a small to conspicuous dorsal nectary scale; stigma small, (sub)apical, often poorly differentiated; ovules usually many, rarely few to one, anatropous, crassi-or tenuinucellate, bitegmic, on parietal to marginal placentae. Fruits usually follicles, and usually ± completely dehiscent along the ventral suture, rarely few-seeded, indehiscent and nutlike; seeds smallish, usually 0.5-1 mm long, elongate-fusiform, longitudinally ridged (costate) or papillate (uni-or rarely multipapillate), rarely
Summary: Four infraspecific taxa in Mediterranean Sedum (S. eriocarpum subsp. apertiflorum 't... more Summary: Four infraspecific taxa in Mediterranean Sedum (S. eriocarpum subsp. apertiflorum 't Hart, subsp. orientale 't Hart, and subsp. spathulifolium 't Hart, and S. litoreum var. creticum 't Hart) were first invalidly published by Hart (1996) in Ot Sist. Bot. Dergisi 2(2), but later validated by Hart (2002) in Fl. Hellenica 2. The valid place and date of valid publication and the type is indicated for all four taxa.
Summary: For three species of Aloe L. (Asphodelaceae subfam. Alooideae), A. canis S.Lane, A. suff... more Summary: For three species of Aloe L. (Asphodelaceae subfam. Alooideae), A. canis S.Lane, A. suffulta Reynolds, and A. lateritia Engl., which are rare in Malawi, detailed habitat information is given to facilitate their recollection in that country. Aloe canis, a Malawian endemic, was observed at three localities in the 1970s by T.P. Campbell-Barker and published as new by S. Lane in 1991; it now may be extinct in the wild in Malawi but, as far as we could ascertain, has persisted ex situ as a single plant in cultivation. Aloe suffulta from Mozambique, Zimbabwe, and South Africa was collected in Malawi only once in the 1970s by T.P. Campbell-Barker, and A. lateritia from Kenya and Tanzania only twice during 1967–68 by B.J. Hargreaves, and in 1991 by P. Downs (†). These collections of A. suffulta and A. lateritia were not supported by preserved specimens.
Abstract: The genus Kalanchoe Adans. (Crassulaceae subfam. Kalanchooideae) is most diverse in Mad... more Abstract: The genus Kalanchoe Adans. (Crassulaceae subfam. Kalanchooideae) is most diverse in Madagascar where about one third of the known ca. 150 species are known to be endemic and all three of the subgenera currently recognised in the genus are represented. We discuss and provide additional information on the natural geographical distribution range of K. dinklagei Rauh, a little-known arborescent species from southern Madagascar.
Abstract: In the past the names Agave lophantha Schiede (1829) and A. univittata Haw. (1831) (Asp... more Abstract: In the past the names Agave lophantha Schiede (1829) and A. univittata Haw. (1831) (Asparagaceae: Agavoideae / Agavaceae) were variously regarded as referring to the same species, or to two different taxa at either species or infraspecific ranks. In clarifying the nomenclature and taxonomy associated with these two names we show that they apply to the same taxon. We further neotypify both names with the same specimen, Howard Scott Gentry, [Arthur] Barclay & [Juan] Arguelles 20410, (US 2558492, barcode 00044294), which is held in US.
Recent molecular phylogenetic studies showed that the genus Sansevieria (excluding S. sambiranens... more Recent molecular phylogenetic studies showed that the genus Sansevieria (excluding S. sambiranensis) forms a monophyletic clade nested within the paraphyletic genus Dracaena. Consequently, the genus Sansevieria was sunk into the genus Dracaena and new combinations were published to accommodate the transfer of taxa from Sansevieria into Dracaena. Since the inclusion of Sansevieria into Dracaena, new taxa have been published in Sansevieria. This paper presents fourteen name changes including twelve new combinations in Dracaena and two rank adjustments, one new synonym, and one lectotypification aiming at further standardisation of the taxonomy of Dracaena.
Three species of succulents are recorded as new for the flora of Mt. Mulanje, the highest mountai... more Three species of succulents are recorded as new for the flora of Mt. Mulanje, the highest mountain in south-tropical Africa in the Southern Region of Malawi: The unidentified "Sansevieria sp." in the "Checklist of the Spermatophytes of Mount Mulanje" (Strugnell 2006) is identified as Sansevieria sinus-simiorum (Asparagaceae / Dracaenaceae), as well as Crassula swaziensis and Crassula setulosa (Crassulaceeae) which were already collected on Mt. Mulanje in 1946 and 1979 but the specimens escaped attention until now. Two collections from the Nyika Plateau in the Northern Region of Malawi similar to but clearly different from Crassula setulosa are reported which might represent a new taxon. Zusammenfassung: Drei Arten von Sukkulenten werden als neu für die Flora des Mt. Mulanje, den höchsten Berg im südlichen tropischen Afrika in der Southern Region von Malawi, verzeichnet: Die nicht identifizierte "Sansevieria sp." in der "Checklist of the Spermatophytes of Mount Mulanje" (Strugnell 2006) wird als Sansevieria sinussimiorum (Asparagaceae / Dracaenaceae) identifiziert, und Crassula swaziensis sowie Crassula setulosa (Crassulaceeae), die schon 1946 und 1979 auf dem Mt. Mulanje aufgesammelt wurden, deren Aufsammlungen aber bisher unbemerkt blieben. Zwei Sammlungen vom Nyika Plateau in der Northern Region von Malawi, die Crassula setulosa ähnlich sind, aber deutlich davon abweichen und ein neues Taxon darstellen könnten, werden berichtet.
VALIDATION OF TWO SECTIONAL NAMES IN ERIOSPERMUM Perry's revision of Eriospermum (1994) included ... more VALIDATION OF TWO SECTIONAL NAMES IN ERIOSPERMUM Perry's revision of Eriospermum (1994) included a new infrageneric classification of the genus with new infra generic taxa being formally described. However, two of the new sectional names were invalidly published due to the lack of typification (Art. 37.1 St Louis Code: Greuter et al. 2000). Although this omission was mentioned in the Index kewensisiIK) as available in the CD-Rom version, or with in the International Plant Names Index (IPNI) internet data base, no action has been taken to validate the names. Consequently, both names are validated here:
Perennial or rarely annual or hapaxanthic herbs to (sub)shrubs, rarely aquatics, treelike, epiphy... more Perennial or rarely annual or hapaxanthic herbs to (sub)shrubs, rarely aquatics, treelike, epiphytic or scandent, with ± succulent leaves, sometimes with succulent stems, rhizomes, underground caudices or succulent roots; indumentum of unior multicellular, often glandular hairs, or plants glabrous. Leaves (sub)sessile or rarely petiolate, usually alternate and spiral, or opposite-decussate or rarely whorled, frequently aggregated into rosettes, simple, rarely compound, usually entire or crenate to lobed, rarely dissected, estipulate. Inflorescences usually terminal, bracteate, usually many-flowered, basically thyrsoids, also pleio-, di-or monochasia (cincinni) or rarely true panicles, racemes or spikes. Flowers hermaphrodite, rarely unisexual, actinomorphic or very rarely zygomorphic, usually proterandrous, (3-)5(-32)merous; sepals free or connate at base, sometimes distinctly unequal in size; petals free or connate to a short to long corolla tube; stamens as many as or usually twice as many as petals; filaments free or ± connate with a tubular corolla; anthers basifixed in basal pit, 4-sporangiate, 2-locular at anthesis, dehiscence latrorse or slightly introrse by longitudinal slits; ovary usually ± superior to semi-inferior; carpels as many as petals, usually free or almost so, sessile or sometimes stipitate, tapering gradually to abruptly into short to long, erect to divergent stylodia, basally with a small to conspicuous dorsal nectary scale; stigma small, (sub)apical, often poorly differentiated; ovules usually many, rarely few to one, anatropous, crassi-or tenuinucellate, bitegmic, on parietal to marginal placentae. Fruits usually follicles, and usually ± completely dehiscent along the ventral suture, rarely few-seeded, indehiscent and nutlike; seeds smallish, usually 0.5-1 mm long, elongate-fusiform, longitudinally ridged (costate) or papillate (uni-or rarely multipapillate), rarely
Summary: Four infraspecific taxa in Mediterranean Sedum (S. eriocarpum subsp. apertiflorum 't... more Summary: Four infraspecific taxa in Mediterranean Sedum (S. eriocarpum subsp. apertiflorum 't Hart, subsp. orientale 't Hart, and subsp. spathulifolium 't Hart, and S. litoreum var. creticum 't Hart) were first invalidly published by Hart (1996) in Ot Sist. Bot. Dergisi 2(2), but later validated by Hart (2002) in Fl. Hellenica 2. The valid place and date of valid publication and the type is indicated for all four taxa.
Summary: For three species of Aloe L. (Asphodelaceae subfam. Alooideae), A. canis S.Lane, A. suff... more Summary: For three species of Aloe L. (Asphodelaceae subfam. Alooideae), A. canis S.Lane, A. suffulta Reynolds, and A. lateritia Engl., which are rare in Malawi, detailed habitat information is given to facilitate their recollection in that country. Aloe canis, a Malawian endemic, was observed at three localities in the 1970s by T.P. Campbell-Barker and published as new by S. Lane in 1991; it now may be extinct in the wild in Malawi but, as far as we could ascertain, has persisted ex situ as a single plant in cultivation. Aloe suffulta from Mozambique, Zimbabwe, and South Africa was collected in Malawi only once in the 1970s by T.P. Campbell-Barker, and A. lateritia from Kenya and Tanzania only twice during 1967–68 by B.J. Hargreaves, and in 1991 by P. Downs (†). These collections of A. suffulta and A. lateritia were not supported by preserved specimens.
Abstract: The genus Kalanchoe Adans. (Crassulaceae subfam. Kalanchooideae) is most diverse in Mad... more Abstract: The genus Kalanchoe Adans. (Crassulaceae subfam. Kalanchooideae) is most diverse in Madagascar where about one third of the known ca. 150 species are known to be endemic and all three of the subgenera currently recognised in the genus are represented. We discuss and provide additional information on the natural geographical distribution range of K. dinklagei Rauh, a little-known arborescent species from southern Madagascar.
Abstract: In the past the names Agave lophantha Schiede (1829) and A. univittata Haw. (1831) (Asp... more Abstract: In the past the names Agave lophantha Schiede (1829) and A. univittata Haw. (1831) (Asparagaceae: Agavoideae / Agavaceae) were variously regarded as referring to the same species, or to two different taxa at either species or infraspecific ranks. In clarifying the nomenclature and taxonomy associated with these two names we show that they apply to the same taxon. We further neotypify both names with the same specimen, Howard Scott Gentry, [Arthur] Barclay & [Juan] Arguelles 20410, (US 2558492, barcode 00044294), which is held in US.
Recent molecular phylogenetic studies showed that the genus Sansevieria (excluding S. sambiranens... more Recent molecular phylogenetic studies showed that the genus Sansevieria (excluding S. sambiranensis) forms a monophyletic clade nested within the paraphyletic genus Dracaena. Consequently, the genus Sansevieria was sunk into the genus Dracaena and new combinations were published to accommodate the transfer of taxa from Sansevieria into Dracaena. Since the inclusion of Sansevieria into Dracaena, new taxa have been published in Sansevieria. This paper presents fourteen name changes including twelve new combinations in Dracaena and two rank adjustments, one new synonym, and one lectotypification aiming at further standardisation of the taxonomy of Dracaena.
Abstract Opening Lecture III Simposio Internacional de Agave / III International Symposium on Aga... more Abstract Opening Lecture III Simposio Internacional de Agave / III International Symposium on Agave, Guadalajara, Jalisco, Mexico, 3. - 5. Noviembre 2016, http://isa.proagave.mx/programa-de-orales-finales
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