incubous

from The Century Dictionary.

• In botany, imbricate in such a manner that the apex of a leaf lies on the base of the next one above, as in the Jungermanniaceæ.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) Having the leaves so placed that the upper part of each one covers the base of the leaf next above it, as in hepatic mosses of the genus Frullania. See succubous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany Describing an arrangement of leaves such that distal (anterior) parts of older leaves overlap the proximal (posterior) parts of younger ones.