The Rose family has 4000 species in 90 genera). Rosa is the ancient Latin name for the rose shrub and for the colour pink. The family is divided into three sub-families  but with most (3000 species) in two sub-families – Rosoideae – which includes potentilla, rose, blackberry, raspberry,  strawberry, meadowsweet and agrimony and Amygdaloideae –  which includes hawthorn, apple, medlar, pear, blackthorn, cherry, flowering cherries, bird cherry, peach and almond. The flowers of the Rose family always have some form of  hypanthium – an extension of the receptacle which may range from cup-shaped to flat, see photo below right.  One result of this is that the family has many different types of fruit, some dry (achenes) but most fleshy. Where the hypanthium completely surrounds the ovaries  and becomes part of the fruit it is is a pome as in the Apple. Where the hypanthium is open, as in the photo of the Cherry below, the fruit is formed from the ovary wall only and is a drupe.

Basic Flower Parts –  5 Sepals, 5 petals, 1 to many Stamens, 1 to many  Carpels. Superior or Inferior Ovary in Hypanthium, Some sub-families have Nectaries. Fruit is an achene (potentilla), drupe (blackthorn, cherry, peach, plum, apricot), pome (apple pear, hawthorn), accessory fruit (rose hip, strawberry) or aggregate fruit. (blackberry).

Dog Rose flower
The Dog Rose is a  tall shrub, reaching 3m. Its petals are pink or white. It is the  most common native wild rose,  growing in woods, hedgerows and scrub in Britain, Europe, SW Asia and N Africa. It is pollinated by bees looking for pollen. It flowers in June and July.
Crab Apple flower
The Crab Apple is native to Europe, including Britain, Western Russia and Turkey. Its scientific name means ‘forest apple’. It is often found in old woods and hedgerows. It is the ‘wild’ apple of Europe but can easily be confused with Orchard Apple trees (Malus domestica) that have grown from the pips of discarded apples.
Wild Cherry hypanthium
The Wild CherryPrunus avium is a tree native to Britain, Western Europe to the Caucasus, the Middle East, and North Africa.The ovary of the Cherry sits in cup which is known as a hypanthium. The presence of a hypanthium is diagnostic of the Rosaceae family.