Cephalotus follicularis is a herbaceous perennial with a rosette of leaves arising from a stout and sometimes surmounting rhizome. In older, mature plants secondary rhizomes emerge from the primary rhizome to form secondary plants. In summer (December through February in Australia) white pubescent flowers, which can number up to 100, are borne on flower stalks that often exceed 2 ft. (61 cm) in length. (Fig. 3-22) In the Northern Hemisphere plants flower during July and August.
Cephalotus is evergreen and tolerates light frosts with no apparent ill effects. With the arrival of spring and warmer temperatures, longer days and more intense sunlight, new growth is initiated and a rosette of green, flat, oval-shaped leaves which are foliage or vegetative leaves develop. Toward the end of the active growing season (September to October) pitchered leaves are prodtjced on the ends of long, pubescent petioles that extend beyond the rosette of foliage leaves so that the pitchers form a ring around the foliage leaves. Often leaves of intermediate form develop. They tend to be flat with a depression of varying depth at the tip. In some cases these intermediate leaves will form a pitcher which, instead of the usual oval-shaped hood, has a deeply incised hood, resulting in a hood with two pointed projections. In shade the plants, pitchers and foliage leaves tend to be large and green, whereas in full sunlight colors ranging from brilliant reds to purples decorate both types of leaves. Pitchers can reach 3 in. (8 cm) in length with a diameter of 1.2 in. (3 cm).
The pitchers are jug-shaped with a hairy lid over the orifice of the pitcher. (Photo 3-11) The lid presents a corrugated appearance resulting from the red to purple colored ridges which radiate from the attachment outward in a fan shape. The grooves are translucent. When light shines through them they appear as openings to insects inside the pitchers.
The openings of the pitchers are oriented outward from the center of the plant. It was once erroneously thought that the lid was capable of motion and could close over the mouth of the pitcher to incarcerate prey.
The pitcher is supported in the back by its petiole while its base usually rests on the soil. The hollow pitcher is given rigidity by 3 pubescent ribs on its front surface. The central rib extends the length of the front of the pitcher while the other 2 start at the mouth and extend to either pitcher side.
The mouth of the pitcher has a prominent rim which is reinforced by numerous ridges that terminate inside the pitcher as sharp, pointed spines. Below the interior rim of the pitcher is a collar about half the length of the lid, containing numerous nectar secreting glands, that overhang the cavity of the pitcher. The collar is differentiated from the cavity of the pitcher both in color and texture. The collar is pale, almost white, with a velvety texture while the cavity of the pitcher in mature specimens is streaked with dark red blotches and is shiny-wet looking.
The sides of the pitcher's cavity are glossy with digestive glands in the upper region. The digestive glands are concentrated in 2 symmetrical regions between the central rib and the rib to either side of it just above the bottom front of the pitcher. Internally these 2 regions are darker in color, usually deep maroon in mature pitchers. Externally they are lighter colored than the surrounding areas of the bottom region of the pitcher.
The flower clusters are borne on a tall scape that may reach 26 in. (66 cm) in length. (Photo 3-12) Individual flowers are small, usually less than 0.2 in. (0.5 cm) in diameter and lack petals. (Fig. 3-23) The 6 greenish white sepals are attractive and appear very waxy. There are 6 long and 6 short stamens; all 12 are shorter than the sepals. Seeds are borne, usually singly, within each of the 6 free carpels. (Photo 3-13) The entire panicle is rather inconspicuous.
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