flowers of thunbergia grandiflora, blue skyflower

acanthaceae australia background bangladesh bengal blossom blue china clockvine common cultivated cultivation dark environmental evergreen eye flora floral flower flowers green houseplant india indochina inside lavender leaf leaves lilac lily long macro mauve names native natural naturalised nature nepal orchid organ ornamental pale pastel petal pink plant purple reproduction root segments shape skyflower skyvine tap thunbergia trumpet trumpetvine tube vine violet weed wildflower yellow