Croton scarciesii (Euphorbiaceae-Crotonoideae), a rheophytic shrub from West Africa, is shown to have been misplaced in Croton for 120 years, having none of the diagnostic characters of that genus, ...but rather a set of characters present in no known genus of the family. Pollen analysis shows that the new genus Karima belongs to the inaperturate crotonoid group. Analysis of a concatenated molecular dataset combining trnL-F and rbcL sequences positioned Karima as sister to Neoholstia from south eastern tropical Africa in a well-supported clade comprised of genera of subtribes Grosserineae and Neoboutonieae of the inaperturate crotonoid genera. Several morphological characters support the relationship of Karima with Neoholstia, yet separation is merited by numerous characters usually associated with generic rank in Euphorbiaceae. Quantitative ecological data and a conservation assessment supplement illustrations and descriptions of the taxon.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Phyllanthus kidna, the only tree species of Phyllanthus from Cameroon, is described and analysed. Its combination of bilocular berries and two connate stamens indicate no clear affiliation with any ...known species or infrageneric group within Phyllanthus. Molecular phylogenetic analyses place it as sister to the Indian and East African species Phyllanthus pinnatus and it is also closely related to the New World species of P. acidus and P. chacoensis. Only five individuals are currently known and the species is assessed as critically endangered. The proposed Mefou National Park near Yaounde could save this species from extinction.
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