petiolar

The petiolar node (B on Figure 2) is dome-shaped when seen from the side.

Leaves are alternate, evergreen, lacking stipules, bipinnate, and lacking petiolar and rachis glands.

Shared features include: lack of spines or prickles, presence of sessile petiolar glands, petals free to the base, and inflorescence a capitulum.

Although Japanese specimens differ morphologically from European M. rubra material, and resemble M. kotokui in petiolar morphology, the name Myrmica rubra is applied to them for the present.

Piper cenocladum (Piperaceae) in the understorey of Costa Rican forests has a petiolar chamber formed by the adpressed margins of a flattened petiole and this is usually occupied by Pheidole bicornis ants.

On closer inspection, the grapevine will show slight differences in the texture and length of the hairs on the vine's shoot, and the veins of a Chardonnay leaf are "naked" near the petiolar sinus - the open area where the leaf connects to the stem is delineated by veins at the edge.