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Plants in the Greenhouse - Philodendron bipinnatifidum

philodendron bipinnatifidum

Philodendron bipinnatifidum showing aerial roots. Photo by Jason Carley.

Although Philodendron bipinnatifidum climbs trees, it is not actually an epiphyte. P. bipinnatifidum is technically a hemiepiphtye, which means that it is a plant that will grow from seed in the soil and climb a tree, or often it will grow attached to a branch and extend its roots down to the soil. Either way, P. bipinnatifidum likes to keep its roots in the soil while enjoying the advantage of greater sunlight gained from climbing other trees, usually palms in its native area of central South America.

Phildodendron bipinnatifidum is a common landscape plant in much of the southern United States and it is admired for its large leaves and spreading form as well as its ability to form aerial roots. It is not its beauty or uniqueness that is most interesting though. The most interesting aspect of P. bipinnatifidum, and most of the plants in the Aroid family (Araceae), is its reproduction process.

philodendron

P. bipinnatifidum with inflorescence. Photo courtesy of Jon Richfield.

The inflorescence of P. bipinnatifidum consists of a spathe and spadix, as can be seen in the photo. The spathe, which is actually a modified leaf, partially encircles the spadix, which is a stiff projection that contains the actual flowers. In fact, there are thousands of tiny flowers located on the spadix. Some of these are male and some female. The male flowers are concentrated at the tip of the spadix, while the females are located at the base. In between these two zones are sterile male flowers. These flowers, especially the sterile males, create great amounts of heat which they produce by burning fat. This process is very common in animals but seldom seen in plants. The temperature of the spadix has been found to be as high as 100ᵒF.[1] The fact that P. bipinnatifidum produces heat is interesting enough, but it is the purpose of this heat that is strangest.

Philodendron bipinnatifidum relies on nocturnal beetles of the genus Cyclocephala for pollination. These beetles are attracted to chemicals that the flowers produce, and by warming the flowers the release of these chemicals is enhanced. As the beetles draw nearer to the source they are able to find the flowers easily due to the heat that is emitted from them. The heat generated by the flowers now serves a new purpose. As beetles land on the flowers they eat some of the pollen, but much of it becomes stuck to their bodies, which will pollinate the next plant. After feeding, the beetles spend the rest of the night and the following day inside the spathe. It is believed that by spending the night near these warm flowers the beetles conserve a great amount of energy, which allows them to more readily fly to the next flower the following evening and continue the process of pollination.

[1] Miller, R., N. Grant, L. Giles, M. Ribas-Carbo, J. Berry, J. Watling & S. Robinson. (2010) In the heat of the night – alternative pathway respiration drives thermogenesis in Philodendron bipinnatifidum. New Phytologist 189:1013-1026.


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