| | Where you can find a given plant |
| | Key |
| | Path A: Old Sarum -top | Path E: Keeper's Cottage - Camp Hill | Road P: To bottom of Camp Hill |
| | Path B: Old Sarum - Outer Rings | Path F: Avon Farm - Salisbury | Road Q: To Little Durnford |
| | Path C: Paths S & W of Old Sarum | Path G: Mill lane - Devizes Road | Road R: Through village to Hathaway Close |
| | Path D: Old Sarum - Keeper's Cottage | Place X: Water Meadow | Road S: Up Phillips Lane to Park & Ride |
| | |
| | Flowering Period |
| | English Name | Path(s) | Start | End | Genus | Species | Family |
| | Bittercress, Wavy | RX | Apr | Sep | Cardamine | flexuosa | Crucifer |
| | Bittersweet | BCG | May | Sep | Solanum | dulcamara | Nightshade |
| | Blackthorn | C | Mar | May | Prunus | spinosa | Rose |
| | Blue Bell | F | Apr | Jun | Endymion | nonscriptus | Lily |
| | Blue Bell, Spanish | C | Apr | Jun | Endymion | hispanicus | Lily |
| | Bramble | C | May | Nov | Rubus | fruticosus | Rose |
| | Brooklime | G | May | Sep | Veronica | beccabunga | Figwort |
| | Bryony, White | C | May | Sep | Bryonia | cretica (dioca?) | Rock-Rose |
| | Burdock, Lesser | CG | Jul | Sep | Arctium | minus | Daisy |
| | Bur-marigold, Nodding | G | Jul | Oct | Bidens | cernua | Daisy |
| | Bur-marigold, Trifid | G | Jul | Oct | Bidens | tripartita | Daisy |
| | Burnet, Salad | B | May | Sep | Sanguisorba | minor | Rose |
| | Burnet-saxifrage | BC | May | Sep | Pimpinella | saxifraga | Umbellifer |
| | Bur-reed, Branched | X | Jul | Aug | Sparganium | erectum ? | Bur-reed |
| | Buttercup, Bulbous | ABC | Mar | Jun | Ranunculus | bulbosus | Buttercup |