Alternate, Opposite, or Whorled

Alternate, opposite, or whorled are all terms for various types of leaf arrangements on a stem, which is also known as phyllotaxy.

Plants with alternate leaves have a single leaf at each node, like this Netleaf Hackberry (Celtis laevigata var. reticulata).

Alternate leaves on a Netleaf Hackberry (Celtis laevigata var. reticulata)

Plants with opposite leaves have a pair of leaves at each node, like this Confederate Jasmine (Trachelospermum jasminoides) shown below.

Opposite leaves on a Confederate Jasmine (Trachelospermum jasminoides)

Plants with whorled leaves have 3 or more leaves around the stem at each node, like this Common Bedstraw or Stickywilly (Galium aparine).

Whorled leaves on a Common Bedstraw or Stickywilly (Galium aparine)