The Collaborative International Dictionary of English v.0.48:
Pappose \Pap*pose"\, a. (Bot.) Furnished with a pappus; downy. [1913 Webster]WordNet (r) 3.0 (2006):
pappose adj 1: (of plants such as dandelions and thistles) having pappi or tufts of featherlike hairs or delicate bristles