File:Asarina procumbens detached, imperfectly dehisced, ripe seed capsule and seeds.jpg

English: Single, ripe, but imperfectly dehisced, seed capsule of Asarina procumbens, detached from plant to reveal structure, having shed five of its roughly conical seeds with testae bearing convoluted, brain-like patterns.

These capsules generally dehisce through two apertures dividing three valves, the central valve bearing the withered remains of the persistent pistil. In this instance, three small apertures have developed around the central valve, but the valve has not become fully detached from the other two, leading to slower-than-usual seed dispersal. Such imperfect dehiscence appears to be quite common in this species.

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).