70. *Spartina Townsendi (Groves). Hampshire. "A distinct but very local form of _S. stricta_, found in one place only." (J. D. H.) 71. Agrostis nigra (With.). 72. Deschampsia flexuosa (Trin.), _var._ Voirlichensis (J. C. Melvill). Perth. 73. *Deyeuxia neglecta (Kunth), _var._ Hookeri (Syme). Ireland. "A distinct variety confined to Lough Neagh." (J. D. H.) 74. Glyceria maritima (Willd.), _var._ riparia (Towns.). Hampshire. 75. Poa Balfouri (Bab.). Scotland. "An alpine sub-variety of a variety of the protean _P. nemoralis_." (J. D. H.) In his comments on this extensive list of supposed peculiar British plants, Sir Joseph Hooker arrives at the following conclusions:-- 1. There are four unquestionably distinct species which do not occur in continental Europe: viz.-- _One_ absolutely endemic species, POTAMOGETON LANCEOLATUS. _Three_ American species, SISYRINCHIUM ANGUSTIFOLIUM, SPIRANTHES ROMANZOVIANA, ERIOCAULON SEPTANGULARE. 2. There are sixteen endemic varieties of British species, viz.-- _Eleven_ of more or less variable species, Caltha palustris, _var._ RADICANS; Polygala vulgaris, _var._ GRANDIFLORA; Cerastium arcticum, _var._ EDMONSTONII; Trifolium repens, _var._ TOWNSENDII; Rosa involuta, _var._ WILSONI; Rubus fruticosus, _sub-sp._ LONGITHYRSIGER; Campanula rotundifolia, _var._ SPECIOSA; Erythraea centaurium, _sub-sp._ LATIFOLIA; Carex involuta, (? Hyb.); Carex vesicaria, _var._ GRAHAMI; Deyeuxia neglecta, _var._ HOOKERI. _Five_ of comparatively well limited species. Arabis petraea, _var._ GRANDIFOLIA; Helianthemum guttatum, _var._ BREWERI; Geranium sanguineum, _var._ LANCASTRIENSE; Oenanthe Phellandrium, _var._ FLUVIATILIS; Spartium stricta, _var._ TOWNSENDI. The above twenty species are marked in the list with an asterisk. Of the remaining fifty-five, Sir Joseph Hooker says, "that for various reasons it would not be safe to rely on them as evidence. In most cases the varietal form is so very trifling a departure from the type that this may be safely set down to a local cause, and is probably not constant. In others the plant is doubtfully endemic; in still others a hybrid."