se·rot·i·nous 
(sĭ-rŏtn-əs, sĕr′ə-tīnəs)
(sĭ-rŏtn-əs, sĕr′ə-tīnəs)adj.
1. Remaining on a tree after maturity and opening to release seeds only after exposure to certain conditions, especially heat from a fire. Used of the cones of gymnosperms.
2. Being a species having such cones: serotinous pines.
[Latin sērōtinus, coming late, from sērō, at a late hour, from sērus, late.]
se·roti·ny (-rŏtn-ē) n.