de·cum·bent 
(dĭ-kŭmbənt)
(dĭ-kŭmbənt)adj.
1. Lying down; reclining.
2. Botany Lying or growing on the ground but with erect or rising tips: decumbent stems.
[Latin dēcumbēns, dēcumbent-, present participle of dēcumbere, to lie down : dē-, de- + -cumbere, to lie down.]
de·cumbence (-bəns), de·cumben·cy (-bən-sē) n.