alternation, the heterogeneous arrangement of plant groups and formations universally present in vegetation.
amathi´um (ἄμαθος, sand of the plain), a sand-hill or sandplain formation; amathad, a sand-hill plant.
ammochthi´um (ἄμμος, sand, ὄχθη, bank), a sand bank formation; ammochthad, a sand bank plant.
anci´um (ἄγκος, mountain glen), a canyon formation; ancad, a canyon plant.
anemi´um (ἄνεμος, wind), a blowout formation; anemad, a blowout plant; anemochore, a plant distributed by wind.
-anum (locative suffix), a suffix denoting a layer.
apostrophe (ἀπό, away from, στροφή, a turning), the arrangement of the row of chloroplasts parallel to the rays of light.
apparent noon, the time when the sun crosses the meridian, i. e., sun noon as distinguished from noon, standard time.
-ard (ἄρδον, water of the land), combining term for water-content; ardium, a succession due to irrigation.
ardesiacus, slate colored.