Glossary of plant morphology others may form a tight spiral, or whorl, around the flower stem. First, at the base, are those non-reproductive structures involved in protecting the flower when it is still a bud, the sepals, then are those parts that play a role in attracting pollinators and are typically coloured, the petals, which together with the sepals make up the perianth (perigon, perigonium). If the perianth is differentiated, the outer whorl of sepals forms the calyx, and the inner whorl of petals, the corolla. If the perianth is not differentiated into sepals and petals, they are collectively known as tepals. In some
Lophospermum scandens with age and developing a woody caudex – a swollen, bulb-like structure at the base of the stem. The leaf stalks (petioles) are long, occasionally twining to grasp supports, thus enabling the plant to climb. The leaves are narrowly heart-shaped, long by wide, with a pointed apex and toothed edges (dentate or crenate). The leaves and stems are sparsely covered with short hairs. "Lophospermum scandens" flowers and fruits from May to November in its native habitat. The flowers are borne singly on stems (peduncles) long. The calyx has sepals that are generally narrowly ovate, long and wide at the base,