Was cultivated as long since as 1683, by Mr. James Sutherland. [468] [Illustration: Nº. 468] Oenothera Tetraptera. White-Flowered Oenothera. _Class and Order._ Octandria Monogynia. _Generic Character._ _Cal._ 4-fidus. _Petala 4._ _Caps._ cylindrica infera. _Sem._ nuda. _Specific Character and Synonyms._ OENOTHERA _tetraptera_ foliis lanceolatis, basi pinnatifido-dentatis, capsulis pedicellatis obovatis quadrialatis. _Linn. Sp. Pl. edit. Wildenou._ OENOTHERA foliis alternis subpinnatis crispis, flore mutabili fructû tetraptero. _Cavanill. Icon. t. 3. p. 40. tab. 279._ Of this genus we have already figured six different species; this is another newly discovered one, which, like most of its kind, displays its beauties chiefly in the night. It is the only one, as far as we yet know, that has white blossoms; these, when first expanded, are beautifully so, but in the morning they change to a purple colour, fade, and their place is supplied by a fresh succession. In this remarkable change of colour, it bears some affinity to the _Oenothera anomala_, which may be considered as strengthening our opinion that the latter plant belongs to this genus rather than to that of _Gaura_. The _Oenothera tetraptera_ is a native of Mexico, its duration as yet not certainly ascertained, but may be treated as a tender annual; and such plants as do not flower the first year, may be preserved under glasses through the winter. It was raised from seeds sent by Mr. Donn, from Cambridge; but was probably first introduced into this country from seeds sent to the Marchioness of Bute, by Prof. Ortega, of Madrid. INDEX. In which the Latin Names of the Plants contained in the _Thirteenth Volume_ are alphabetically arranged. _Pl._ 457 Alöe plicatilis. 455 Alöe retusa. 453 Amaryllis Reginæ. 462 Anthemis Pyrethrum. 441 Antholyza Merianella. 458 Aristea cyanea. 433 Azalea pontica. 451 Blakea trinervia. 466 Calycanthus præcox. 444 Canarina Campanula. 454 Canna indica. 452 Cardamine trifolia. 459 Convolvulus Cneorum. 445 Coronilla Emerus. 449 Dillenia speciosa. 456 Diosma serratifolia. 467 Dracocephalum virginianum. 463 Epidendrum ciliare. 440 Erica albens. 447 Erica empetrifolia. 443 Erica physodes. 442 Genista linifolia. 450 Gladiolus Watsonius. 435 Gnaphalium ericoides. 436 Hibiscus præmorsus. 437 Hydrangea Arborescens. 438 Hydrangea Hortensis. 461 Jasminum fruticans. 439 Illicium floridanum. 465 Indigofera angustifolia. 460 Maurandya semperflorens. 448 Mesembryanthemum micans. 468 Oenothera tetraptera. 434 Oxybaphus viscosus. 446 Psoralea bracteata. 464 Sisyrinchium gramineum. INDEX. In which the English Names of the Plants contained in the _Thirteenth Volume_ are alphabetically arranged.