Periwinkle offers a lovely little flower, but it is the leaves and the seeds that are used in folk medicine. The leaves and seeds are rich in the chemical vincamine, an alkaloid that has positive effects on memory and has long been used to combat the effects of aging.eriwinkle is used in folk medicine in the Philippines as a remedy for diabetes. Most of these practices are still followed. Rosy periwinkle grows up to two and a half feet tall. Leaves are oval and have a glossy surface.
C4 envelopes are 229 x 324 mm in size and a A4 card blank can fit inside or an A3 card blank folded in half. These C4 envelopes are ideal for sending A4 documents or certificates. C5 envelopes are 162 x 229 mm in size and fit an A5 card blank or A4 card blank folded in half.
A4 is the standard size of paper used for computer printouts and other uses. A4 paper is 210 Ã 297 mm. It has an area of 1/16 square metres. It is one of a series of pape â¦ r sizes starting with A0, which has an area of 1 square metre.  Another Answer The advantage of using A-series of paper sizes is that the height to width ratio remains constant throughout the series.hare to: A4 is approximately 297 mm by 210mm and has an area of exactly 1/16 sq m = 0.0625 sq m = 625 sq cm The A series of paper is based on the fact that they all have the same ra â¦ tio of width to length.