An arrangement of leaves or other parts in which they cme off several at the same level around the stem.
A shrub with leaves with expanded blades.
Long needles an two to several fascicles.
A shrub with leaves that are short needles, arranged in two ranks along twig, or sometimes appressed…
Flowers clusters conspicuous because of large, leaf like, pink sepals.
Flowers white in stalked globose clusters; fruits aggregated in spherical.
A shrub with berries on it.
Leaflets usually 3, very prominently toothed.
Leaflets usually more than 3; not prominently toothed.
Leaflets many and small, usually 12-22; tree prominently thorny.
Leaflets fewer and large, usually 9; tree not thorny.
Leaves with small, orange wax glands on te lower surface when examined with lens; leaves usually prominently…
Trees with swollen bases; fruit that drupe, longer than wide.
Leaves usually with a few remote teeth above the middle or at least bristle-tipped; fruit a red or black…
Leaves leathery, broad, and with a conspicuous vein running just inside the margin.
Flower clusters lateral; fruit not winged.
Leaves with several veins running from base to apex; stems often thorny.
Leaves leathery, toothed only near the apex.
Leaves not leathery, entire or with wavy edges.
Leaves alternate, not prominently toothed, subcordate at the base.
Leaves opposite, with wavy margins or angularly toothed.
Divisions of plant body fine and many; plant body usualy floating below the surface.
Divisions of plant body coarse, two lobed; floating on surface.
Plants floating just below water surfacel plant body made up of a clump of short filaments.
Plant body of small overlapping scales.
Plants simple, extremely minute, appearing as grains on surface of water.
Plant body inconspicuously nerved, roolets one per disk.
Plant body conspicuously nerved, roolets two to several per disk.
Branches of stem bearing small bladders; slowers showy, purple.
Plant body made p of smooth, proliferating stems.
Plant body made up of stems bearing whorled, brittle branches.
Submerged leaves bearing bladders; flowers irregular, showy ellow or purple.
