The other day I went to look for wild Smilax aspera berries. Lucky enough, there were some still standing in the plants. Also, there were some flowers so I thought maybe you could be interested in this prickly vine (although I´m afraid the most suited specie for an alpine trough...)
A dioecious vine that can reach 15 m, Smilax aspera can make some forests impenetrable. It is distributes through south Europe, West Asia coastal mediterranean, Canary Islands and Madeira and North Africa. An extended flowering season (IV-XII) allows an also extended fruiting time (II-XII). Formerly included in Liliaceae family, now it has its own one: Smilacaceae. Male and female flowers are similar in size and shape, and fruits, red in the begining, are almost black when fully riped. Leaves have a high variation in shape, colour, spots and prickles.
Pictures show: a) Male flowers, b) Female flower, c) Two very different plants growing together, d) Different leaves and e) Berries