ox·lip 
(ŏkslĭp′)
(ŏkslĭp′)n.
A Eurasian primrose (Primula elatior) having yellow flowers clustered in a one-sided umbel.
[Middle English oxeslippe, from Old English oxanslyppe : oxan, genitive sing. of oxa, ox + slyppe, slimy substance; see sleubh- in the Appendix of Indo-European roots.]