1. Sunflowers do not have a pulvinus below their inflorescence. 2. A pulvinus on a petiolule is called a pulvinulus. 3. This is the largest pulvinus of any known plant. 4. Base of petiole swollen to form the pulvinus . 5. A pulvinus is also sometimes called a geniculum. 6. The pulvinus is a motor structure consisting of a rod of sclerenchyma surrounded by collenchyma. 7. The leaf stems measure between 1 and 3 mm long, swollen at the base; often reduced to a pulvinus . 8. Leaves green, sessile or shortly but distinctly petiolate, petiole with pulvinus , lower side, lower side of leaves mostly lanuginose. 9. This is followed by an efflux of water, resulting in a sudden change of turgor pressure in the cells of the pulvinus . 10. At the base of each frond, surrounding the pulvinus like two catcher's mits, is a pair of fleshy stipules.
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