Geophila repens (L.) I.M. Johnst.

Etymology Genus Earth-loving; referring to its creeping habit
Species Creeping; referring to its habit
Family Rubiaceae
Synonyms Psychotria herbacea L., Geocardia repens (L.) Bakh.f.
Common Names Snake Pennywort (Pegaga Ular), Rat Pennywort (Pegaga Tikus)
Status Native: Endangered
Form Creeping herb
Native Distribution Pantropical

Diagnostics:

An uncommon prostrate herb that can only be found in a few localities (see description). It is shade-loving, hence only found under tree canopies. The leaves are oppositely arranged, rounded with a heart-shaped base. The leaf blade is also hairless, mildly glossly, and palmately-veined. A useful guide is to look out for its small but bright orange fruits, which are almost always present.


Interesting Facts:

Its pollination and dispersal biology are poorly-documented, though Guppy (1906), and Ridley (1930) suggested it to be bird-dispersed because the brightly coloured fruits. A study by Yumoto (1999) in Colombia confirmed this through the observations of the Salvin's curassow (Mitu salvini), a ground-dwelling bird feeding on the fruits and postulated that it is an important disperser for Geophila repens.

Natural populations can still be found at the southern regions of Singapore, namely: at the manicured grass patches near Peirce Road, Henderson Road, Makeway Avenue, and Orchard Boulevard; in the cemeteries at Jalan Kubor and Outram Road; in Pearl's Hill City Park, Fort Canning Park, and Istana Park; and in the natural vegetation adjacant to Jacob Ballads Children's Garden (Teo et al., 2010; pers. comm. Crag W. & Koh J.; pers. obs.).


The Snake Pennywort, photographed in Pearl's Hill City Park.

Bright orange fruits and close-up of leaves.

The star-shaped flower.


References

Guppy HB. (1906) Observations of a Naturalist in the Pacific between 1896 and 1899. Volume II: Plant-Dispersal. Macmillan and Co Limited, New York. 627 pp.
Ridley HN. (1930) The Dispersal of Plants throughout the World. L. Reeve & Co., LTD., London. 744 pp
Teo S, BR Kurukulasuriya & HTW Tan. (2010) The distribution and status in Singapore of the snake pennywort, Geophila repens (L.) I.M. Johnst. (Rubiaceae). Nature in Singapore, 3: 183-186.


Author: Jake
Posted Date: 2012-01-13 / Modified Date: 2015-01-11