In case you didn’t know it, as I didn’t, “acicula” are needlelike parts: thorns, spines, bristles, or needlelike crystals. The singular form is  “aciculum.”

The rose hips are where the rose seeds are contained. Not doing any deadheading of the old rose blooms will allow the rose hips to form, which can then be harvested either to use the seeds inside to grow a new rose bush. Rosehips may be eaten, taking care to avoid the hairs that line the inside of the fruit and often times cover the seeds. They are literally itching powder and uncomfortable enough when they come into contact with your skin, let alone ingesting them!