Socratea exorrhiza

E. J. H. Corner in 1961 hypothesised that the unusual stilt roots of S. exorrhiza were an adaptation to allow the palm to grow in swampy areas of forest. No evidence exists that stilt roots are in fact an adaptation to flooding, and alternative functions for them have been suggested. John H. Bodley suggested in 1980 that they in fact allow the palm to "walk" away from the point of germination if another tree falls on the seedling and knocks it over. If such an event occurs then the palm produces new vertical stilt roots and can then right itself, the original roots rotting away.{{cite journal Iriartea has similar stilt roots to S. exorrhiza. ==Epiphytes==

Many different species of epiphyte have been found to grow on S. exorrhiza. A study of 118 individual trees in Panama found 66 species from 15 families on them. Bryophytes covered up to 30% of the stems, and the relative coverage increased as the stem diameter increased. Around half of the trees studied had vascular epiphytes growing on them. Up to 85 individuals from 12 different species were found on one palm, and another tree was colonised by a total of 16 different species. The most common epiphytes were three species of fern, Ananthacorus angustifolius, Elaphoglossum sporadolepis and Dicranoglossum panamense, altogether accounting for 30% of all the individuals recorded. Other common species, representing more than 5% of the individuals found, included Scaphyglottis longicaulis (Orchidaceae), Philodendron schottianum (Araceae) and Guzmania subcorymbosa (Bromeliaceae). Almost half of the species recorded were rare, however, with only between 1 and 3 individuals being recorded on all of the palms. A clear vertical distribution was found between different species: some grew in the understory, other in the midstory and others in the canopy. Trees with epiphytes were found to be significantly larger than those without. This suggests that the palms must reach a certain age before they are colonised; for example, it is estimated that palms must be 20 years old before they are colonised by vascular epiphytes. ==Leaf morphology==

Leaves of S. exorrhiza that grow in the sun are thicker, have more trichomes and more stomata than those that grow in the shade. Among the younger trees the leaflets are all arranged along a single plane, as with Howea, but in older individuals the leaflets are scattered among many planes as in the queen palm. ==Predators==

White-lipped peccaries consume a large proportion of the seeds of S. exorrhiza and play an important role in limiting their population.{{cite journal |title=Removal of palm fruits and ecosystem engineering in palm stands by white-lipped peccaries (Tayassu pecari) and other frugivores in an isolated Atlantic Forest fragment ==Reproduction==

Socratea exorrhiza flowers mostly during the dry season and is considered to be beetle pollinated, being frequently visited by species of Phyllotrox (Derelomini) and Mystrops (Nitidulidae). Seeds weigh around 3.5 g and are around 2 cm long and 1.5 cm wide, only around 45% of them germinate and around one quarter of these die. ==Uses==

Source: The trunk is used in the construction of houses and other structures, as well as hunting spears. It is usually split lengthwise before it is used, but it can also be hollowed out and used as a tube. The inner parts of the stilt roots are used as a male aphrodisiac. A harpoon foreshaft identified as wood of the palm was found with a large flaked lithic projectile point in an underwater preceramic site the middle Xingu. ==References==