stylet

Stylet: a small style or stiff process: one of the piercing mouth structures in Diptera and Hemiptera.

Leaves alternate, pinnate with stylet in place of the odd leaflet.

Leaves abruptly pinnate, the place of the odd leaflet taken by a stylet.

Leaves opposite, abruptly pinnate with a stylet in place of the odd leaflet.

The question being asked, 'How can the stylet be procured to satisfy curiosity?'