Complex sentence: They have large leaves from 20-35cm with prominent veins carried in opposite pairs and with a terminal of an umbel or corymb of tubular/open ended white, pink or creamy flowers with 5 spreading petals.
Split into simpler sentences: They have large leaves from 20-35cm with prominent veins carried in opposite pairs. The inflorescence is a terminal umbel or corymb of tubular/open ended white, pink or creamy flowers with 5 spreading petals.