Species within a genus

calendae, = the Kalends, Calends, the first day of the Roman month, on which the order of days was proclaimed; from calo, to call, call out, proclaim, call together, summon, convoke; calendar, clock;
-ula, = diminutive.
(little calendar, little clock or perhaps, little weather-glass)
(ld, Ox, BL)

populus, = a poplar, poplar-tree;
folium, = a leaf.
(ld)

prosterno, prostratus, = to strew in front of, to strew before one; to throw to the ground, throw down, overthrow, prostrate;
-atus, = indicates possession or likeness.
(lying flat upon the earth or any other thing)
(ld, BL)