Spatane diterpenoids from the brown alga Stoechospermum.
Stoechospermum polypodioides. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Accessed 11 May 2017. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.Two spatane diterpenes, the new 5 (R),16 (S)-diacetoxyspata-13,17-diene and the known 5 (R),16 (S)-dihydroxyspata-13,17-diene have been isolated from the brown alga Stoechospermum marginatum.The structures were elucidated from chemical and spectroscopic evidence. The absolute stereochemistry was determined using the modified Moshers method.Leucospermum is a genus of evergreen upright, sometimes creeping shrubs that is assigned to the Proteaceae, with currently forty-eight known species.Almost all species are easily recognised as Leucospermum because of the long protruding styles with a thickened pollen-presenter, which jointly give the flower head the appearance of a pincushion, its common name.
Conospermum caeruleum, commonly known as blue brother, is a shrub in the family Proteaceae and is endemic to the south west of Western Australia.It is a prostrate shrub with small, dense heads of blue, rarely pink flowers and usually grows in heavy soils subject to flooding.Pollen grain characteristics of 21 Chimonanthus praecox cultivars in 3 groups were examined and compared under scanning electron microscope (SEM), and principal component analysis and cluster analysis were conducted based on observation results. The results showed that the pollen grain was in mid-size, and in suboblate to globular shape. The exine ornamentation could be divided into two types.
Leucospermum is a genus of flowering plants that belongs to the Protea family. The Leucospermum genus consists of approximately 50 species, most native to South Africa where its natural habitat includes mountain slopes, scrubland and forests. Depending on the variety, Leucospermum ranges from low-growing ground covers to small trees. Some.
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