File:Asarina procumbens single capsule showing dehiscence by three valves.jpg

English: A single ripe capsule of Asarina procumbens, the trailing snapdragon, showing dehiscence by two apertures between three valves, the central valve still bearing the withered, brown remains of the persistent pistil. Also visible, the long, sinuous peduncle and the calyx lobes, both pubescent and both withered to brown, contrasting with the glabrous, pale buff seed capsule itself, the nearside aperture revealing seven ripe seeds, ready to be shed. The seeds are roughly conical, circa 1.0 x 1.5 mm and their testae are deeply furrowed in convoluted patterns reminiscent of a human brain or the cap of the fungus Gyromitra esculenta, the False Morel.

Asarina procumbens, the trailing snapdragon, is a protected wildflower native to the Pyrenees, which has nonetheless proved capable of thriving as an attractive weed in some harsh urban environments - notably in the Australian city of Melbourne. The single seed capsule shown here was borne by one of about four specimens (or possibly a single specimen with multiple points of emergence) growing out of a wall in front of the church (site of the Old Smithy) in the oldest part of the village of Paxton, Scottish Borders (near Berwick-upon-Tweed).

Several specimens of this plant are said to have been growing at this site for quite some time. Given the proximity of the extensive gardens of nearby Paxton House the species may represent either an escape or a deliberate introduction from that estate (around which the village grew).