bark California green leaves Prickly silk floss tree spikes thorns tree trunk usa beautiful beauty branch bud Ceiba Ceiba speciosa flower flowers madeira Malvaceae Malvales natural nature petal pink Pink flowers all-weather-space bottle-shaped bottle-tree branched ceiba-chodatii conservatory deciduous display displayed distinctive dome exotics floss-silk-tree flower-dome gardens Gardens-by-the-Bay glasshouse gnarled greenhouse grotesque horticultural horticulture indoors inside palo-borracho shape shaped shapes Singapore South-American stored-water subtropical surface surfaces swollen-trunk texture textures tropical unusual utilitarian vegetation warty-tree