perennial

equivalents

continual

long

synonyms

abiding

age-long

aged

amphibian

ancient

angiosperm

annual

antique

aquatic plant

articulated

biennial

catenated

ceaseless

chattering

chronic

concatenated

connected

constant

continual

continual

continued

continuing

continuous

cosmopolite

cutting

cyclical

deciduous

deciduous plant

dicot

dicotyledon

direct

diuturnal

durable

endless

enduring

enduring

ephemeral

eternal

ever-blooming

ever-new

evergreen

everlasting

exotic

featureless

flowering plant

fungus

gametophyte

gapless

gymnosperm

half-hardy

same-contexts

abundant

annual

dewy

eternal

fragrant

hardy

herbaceous

inexhaustible

inward

luxuriant

permanent

perpetual

tropical

unending

unfailing

rhymes

bicentennial

biennial

centennial

decennial

millennial

quadrennial

triennial