Salix; Salvia; Sambucus; Sanchezia; Santolina; Sarcococca; Skimmia; Syringa:
The great thing about doing close up photography of flowers , is that you get to know them quite intimately. This shrub - Sarcococca hookeriana var. digyna - has gorgeous scented flowers - and in the middle of winter at that. So, for the 'S' section, it gets my vote.
Salix - Weeping Willow - Pussy Willow: - There are several Salix that can lay claim to being true shrubs - rather than trees. Some are dwarf enough to grow in a rock garden. Together with this, some of the tree types can be heavily pruned each year to give a stunning display of winter colour via their coloured stems.
Salvia – Sage: - The Salvias are a huge range of flowering and foliage plants. Some can lay claim to being shrubs, whilst others are best described as perennials of sorts. there are others of course, that are herbs. It is a range of plants well worth exploring.
Sambucus – Elderflower - Elderberry. Normally a hedgerow tree - or even weed - there are some Sambucus that are worthy of discovery as shrubs. Purple and gold foliage amongst them.
Sanchezia: - These are basically rainforest shrubs - evergreen with attractive foliage. Flowers are also attractive. One for tropical countries and certainly not hardy.
Santolina – Cotton Lavender: - Attractive low-growing evergreen shrubs with cream or yellow flowers. Some types have silver foliage. All are good ground cover plants, and whilst better in full sun, will also do well in moderate shade. Can be cut back hard each year to contain the spread.
Sarcococca – Christmas or Sweet Box: - Low growing dense foliage evergreen shrubs. Sweetly scented flowers mid-winter. Good groundcover, and good for shade.
Silk Tree - Albizia: See Albizia
Snowball Tree - Viburnum: - See Viburnum
Sophora: - group of shrubs related to the pea family. Most are hardy in milder areas, and have attractive flowers and foliage. Protected area best for long life.
Sorbaria: - To all intents and purposes, this shrub looks like 'mountain ash' suckers. Not so. It is a small group of sucjerous deciduous shrubs suitable for woodland or open aspect. Attractive flowers held aloft of pinnate foliage.
Spartium: - The Spanish Broom. Well worth growing for the bright yellow flowers that persist through summer and into the autumn. the sweet scent is an added bonus.
Stephanandra: - Deciduous with arching growths - full of flowers in early summer, but the Autumn foliage is what I really like about this shrub.
Stewartia: - Stunning bark on the tree types, but a few shrubby types with white flowers - not unlike the single Camellia flowers. generally hardy.
Styrax: - Small tree - but well suited to planting in largish shrub borders. hanging snowdrop-type flowers of pure white.
Summer Sweet - Clethra: - See Clethra