perennial

Upright brome Bromus erectus with ligule spikelet and lemma

Stiff sedge Carex biglowii with rhizome and vegetative tufts, two stigmasm ligule, fruit and glume

Sundew Drosera rotundifolia with basal rosette of leaves and emerging flowering spikes

Sweet flag Acorus calamus fruit growing from leaf, pencil

Potato Solanum tuberosum vs Sweet potato pomoea batatas tuber diagram

Sweet woodruff Asperula odorata with cross section of stem and seeds and flowers on the plant

Tall fescue Festuca arundinaceae with ligule spikelet and lemma details

Toothwort Lathrea squamaria flower with lack of chlorophyll explaining its parasitic life style

Tor grass Brachypodium pinnatum with ligule, spikelet, and lemma detail

Tormentil Potentilla erecta plant showing both shapes of leaves

True fox sedge Carex vulpina tussock

Tubular water dropwort Oenanthe fistulosa in amongst grasses with flowering head and seed head, and showing the stem swelling as well as leaves

Snowdrop Galanthus nivalis pencil drawing

Snowdrop Galanthus nivalis with one flower

Soft rush Juncus effusus pecil drawing

Southern Marsh Orchid Dactylorhiza praetermissa

Slender St Johns Wort Hypericum pulchrum

Slender St Johns Wort Hypericum pulchrum showing red basal leaves and details of the calyx

Small scabious Scabiosa columbaria with flower detail and showing vegetative growth along a stolon

Sneezewort Achillea ptarmica plant

Rosebay Willowherb Chamaenerion angustifolium

Rye grass Lolium perenne and individual spikelet

Sage Salvia officinalis in flower

Salad burnett Sanguisorba minor with detail of individual male and female flowers