The Collaborative International Dictionary of English v.0.48:
Vetchling \Vetch"ling\ (v[e^]ch"l[i^]ng), n. [Vetch + -ling.] (Bot.) Any small leguminous plant of the genus Lathyrus, especially Lathyrus Nissolia. [1913 Webster]WordNet (r) 3.0 (2006):
vetchling n 1: any of various small plants of the genus Lathyrus; climb usually by means of tendrils