The following is a list of some of the plants of Lower Brittany that are rare in the departments of Finistère, Morbihan, and Côtes-du-Nord, omitting the names of those already given as pertaining to calcareous soils and the seaboard sands:—
| Thalictrum flavum. | Trifolium Michelianum. |
| Fumaria micrantha. | " angustifolium. |
| Raphanus maritimus. | Lupinus reticulatus. |
| Crambe maritima. | Potentilla vaillantii. |
| Cochlearia anglica. | Pyrus aucuparea. |
| Helianthemum umbellatum. | Scleranthus perennis. |
| Viola palustris. | Eryngium viviparum (sp.). |
| Astrocarpus Clusii. | Torilio heterophylla. |
| Arenaria montana. | Sium angustifolium. |
| Lavatera arborea. | Œnanthe pimpinelloides. |
| Ervodium maritimum. | Peucedanum officinale. |
| Ulex Galii. | Linosyris vulgaris. |
| Adenocarpus complicatus. | Artemisia gallica. |
| Erica vagans. | Crepis setosa. |
| " setosa. | Gladiolus illyricus. |
| Linaria pelisseriana. | Pancratium maritimum. |
| " supera. | Juncus obtusiflorus. |
| Teucrium scordium. | Eriophorum vaginatum. |
| Statice rariflora. | " gracile. |
| Plantago carinata. | Carex teretiuscula. |
| Quercus toza. | " triformis. |
| Zostera nana. | Polypogon littoralis. |
| Epipactis palustris. | Agrostis spica venti. |
| Malaxis paludosa. | Cynosurus echinatus. |
| Isoetes Delalandei. |
These in addition have been noted in Finistère:—
| Diplotaxis muralis. | Scilla verna. |
| Astragallus Bayonensis. | Juncus squarosus. |
| Pyrus aucuparea. | Scerpus cœspitosus. |
| Cineraria spathulæfolia. | Eriphorbium vaginatum. |
| Gentiana campestris (sp.). | Carex dioica. |
| Erythria diffusa. | " punctata. |
| Lithospermum prostratum (sp.). | Crypsis aculeata. |
| Anchusa italica. | " schœnoides. |
| Galeopsis versicolor (sp.). | Bromus velutinus. |
| Teucrium scordium. | Lycopodium selago (sp.). |
| Urtica membranacea (sp.). | Grammitis leptophylla (sp.). |
| Triglossum Barrilieri. | Polystichum oreopteris. |
| Orchis palustris. | Hymerophyllum tunbridgense (sp.). |
| Narcissus reflexus (sp.). |
These also in the Côtes-du-Nord:—
| Erodium botrys. | Eufragia latifolia. |
| Selinum curvifolia. | Polygonum bistorta (sp.). |
| Cirsium acaule. | Paris quadrifolia. |
| Gentiana amarella (sp.). | Aira flexuosa. |
| Symphytum tuberosum. |
Côtes-du-Nord has the advantage of the limestone bed of S. Juvat, where many of the plants given in the first list may be gathered. Ille-et-Vilaine is still more favourably situated for calcareous rocks. There is a considerable basin south of Rennes, with a corresponding flora, generally known to botanists as the limestone tract of S. Jacques.
Such plants as are common throughout the country have not been included in the lists.