Mr. J. JMiei's on several genera hitherto placed in Solanacese. 169 



succession. I proceed now to add a few remarks upon each tribe 

 separately. 



1 . Nicotianece. — The aestivation of the corolla in this tribe, as 

 has been just remarked, is by no means valvate, or iuduplicato- 

 valvate, as in the Solanacece, the lobes of its border being on the 

 contrary conduplicate, that is to say, the sides are turned inwards, 

 and each lobe is thus folded separately on its inner face, along 

 the central nervure, the sides closely pressed together, the mar- 

 gins being quite free from those of the adjoining lobes, and thus 

 plicated, they all possess a spirally twisted inclination in the bud. 

 This approaches the estivation of the Salpiglossidece, to which 

 tribe they offer a still nearer affinity in having the fifth stamen 

 very often shorter, with the other four somewhat didynamous. 

 It is for these reasons that I have removed the Nicotianece from 

 the Solanacece, where I formerly placed them. 



2. Daturece. — With this very natural group Solandra has been 

 associated by most botanists, but it evidently possesses a very 

 different relationship. The Daturece are remarkable for their 

 large showy flowers, and they all present an sestivation similar to 

 that of the Nicotianece, only more decidedly contortive and quite 

 distinct from the valvate praefloration of the Solanacece. Brug- 

 mansia I consider as most decidedly distinct generically from 

 Datura, with which it is associated by most botanists, differing 

 in many points of structure, and forming arborescent shrubs, 

 sometimes even tall trees, with long pendent trumpet-shaped 

 flowers of an unusually large size. 



3. Duboisiecs. — The genera composing this very distinct group 

 were partly included by Mr. Bentham (Prodr. DeCand. x. 191) 

 in his Salpiglossidece ; these are Duhoisia and Arithocercis, to 

 which Prof. Endlicher added Antlwtroche, a genus which by the 

 former has been referred to Solanacece. In pro])osing to alter 

 the decisions of so distinguished a botanist as Mr. Bentham, who, 

 from the accuracy of his observations and the solidity of his con- 

 clusions, stands deservedly as one of the first botanists of our 

 time, it becomes necessary that I should offer some extremely 

 valid reasons for the changes now suggested, and accordingly I 

 will offer a few remarks on each genus in succession. 



a. Duboisia appears to me to have no relation with any genus 

 belonging to the Scrophulariacece. Its only species was originally 

 described by IMr. Brown in his ' Prodr.' p. 448, who placed it, 

 together with Anthocercis, in a second section of Solanece. The 

 habit of this plant, as well as the structure of its flowers, are 

 there stated to agree with those of Myojwrum, whence it derived 

 its specific name : the figure given of this plant by Endlicher in 

 his ' Iconographia,' pi. 77, sufficiently agrees with other Myo- 

 poraceous plants there designed. On examining a specimen of 



