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2528 results found for ' threatened species' (displaying page 1 of 253)
Hyacinthaceae
Plant... sap. The leaves are mostly held upright but in several species from the South African winter rainfall area they lie ... Mostly the leaves are smooth and unmarked but in most species of Ledebouria (also some Lachenalia and Eucomis ... with warts or pustules, or coarse hairs, especially in species of Lachenalia and Massonia . In some species the ...
... Due to the long history of a lack of research into this species, very little is published about the ecology or biology of the species. Many orchids have a specific pollination regime in ... species ( Brachycorythis conica subsp. transvaalensis ) is threatened with extinction. This species was overlooked by ...
Iridaceae
Plant... or corm (rarely a bulb in some New World and Eurasian species). The leaves are usually two-ranked with the blade ... upper and lower leaf surfaces. In many South African species the leaf has a thickened midrib and often variously ... or winged margins that may also be crisped. In some species the leaves are needle-like with narrow longitudinal ...
Pteronia aspera
Plant... gomknoppe , meaning ‘gummy heads’. Several Pteronia species are characterised by their long sticky flower heads. ... flower heads are a source of propolis. Females of the bee species Pachyanthidium carniventre , P. tuberculiferum and ... have also been collected on the flowers of Pteronia species. Tarcardia lac insects on Pteronia inguilata secreted ...
... flying insects are observed visiting the flowers of this species, as a food-source. It is not known whether they also fulfil a role of pollination. This species is useful as fodder for animals in the dry areas of the winter rainfall region. This fast-growing species is also recommended for planting where the veld has ...
Pteronia incana
Plant... does not open to release a seed. Similar to the related species Pteronia paniculata , Pteronia incana cannot resist ... does not resprout if it is burned in a fire. However, this species abundantly reproduces itself from seeds, which ... after fires, when conditions are favourable. Related species growing in the Fynbos regions do resprout after ...
Euphorbia umfoloziensis
Plant... , which occurs in the Mpumalanga province. These species both possess a single cyathium at the flowering eye ... other euphorbias. The main difference between these two species is the thickened tap root of E. umfoloziensis, while ... are fused in a cyathium. While plants of some Euphorbia species are bisexual, the plants of others are either male or ...
Encephalartos heenanii
Plant... that were subjected to regular fires, however surviving species are mostly growing within pine plantations from which ... objections were raised based on the following points: species such as E. cycadifolius , E. ghellinckii , ... 1 species of Stangeria . South Africa also has the most threatened species: 3 species are Extinct in the Wild (EW) ...
... objections were raised based on the following points: species such as Encephalartos cycadifolius , E. ghellinckii ... is rich in dolomite. Cycads are considered to be the most threatened taxonomic group of organisms, according to the ... near the coast. More than 78% of South Africa's cycads are threatened with extinction compared to the global average of ...
Cyrtanthus
Plant... obliquus ). Photos Graham Duncan Bulbs of many Cyrtanthus species produce offsets, whereas others form bulblets beneath ... galanthamine, haemanthamine, obliquine and tazzetine. Species with striking, funnel-shaped, bright red or scarlet ... in autumn, spring and summer. Many mainly spring-flowering species, such as C. breviflorus , C. contractus and C. tuckii ...