DIDYNAMIA GYMNOSPERMIA. _Generic Character._ _Filamenta_ bifurca; altero apice antherifera. _Stigma_ bifidum. _Specific Character and Synonyms._ PRUNELLA _grandiflora_ foliis omnibus ovato oblongis subserratis, calicis labio superiore profunde trilobo. _Linn. Syst. Nat. ed. 13. Gmel. p. 920. Jacq. Fl. Austr. v. 4. t. 377._ PRUNELLA prima. _Clus. Hist._ xlii. PRUNELLA cærulea magno flore. _Bauh. Pin. 261._ [Illustration: _N^o. 337_] The plant here figured, which we have several years cultivated in our garden at Brompton, without discovering in it the least disposition to vary, is undoubtedly the same as is figured by Prof. JACQUIN, in his _Fl. Austr._ under the name of _grandiflora_; he regards it as a distinct species, and as such it is introduced in Prof. GMELIN's ed. of the _Syst. Nat._ of LINNÆUS: Mr. AITON, in his _Hort. Kew._ following LINNÆUS, makes it a variety of the _vulgaris_, a common English plant, which we have never seen to vary much in the size of its flowers. Prof. JACQUIN informs us, that it grows wild, mixed with the _laciniata_ (a kindred species with yellowish flowers) on the Alps; it is found also in similar situations in various other parts of Europe. In July and August, it puts forth its large shewy blossoms, of a fine purple colour. Such as are partial to hardy herbaceous plants, of ready growth, which are ornamental, take up but little room, and are not apt to entrench on their neighbours, will be induced to add this to their collection. It is propagated by parting its roots in autumn. [338] ALLAMANDA CATHARTICA. WILLOW-LEAV'D ALLAMANDA. _Class and Order._ PENTANDRIA MONOGYNIA. _Generic Character._ Contorta. _Caps._ lenticularis erecta echinata 1-locularis polysperma. _Semina_ bractæata. _Specific Character and Synonyms._ ALLAMANDA _cathartica_. _Linn. Mant. p. 214. Suppl. p. 165. Syst. Vegetab. ed. 14. Murr. p. 252. Ait. Kew. V. 3. p. 489._ ORELIA _grandiflora_. _Aubl. Guian. p. 271. t. 106._ [Illustration: _N^o. 338_] This beautiful stove plant (a native of Cayenne and Guiana, where it is said to grow by the sides of rivers) was introduced to this country in 1785, by Baron HAKE[3]; it has since flowered in many of our collections, usually in June and July.