On the Genus Tu1GUERA of Cavanilles: dy Joun Miers, Esq., 
R.S., , &e 
TRIGUERA. 
This hitherto obscure genus was first described in 1786 by Cavanilles 
(Diss. 2. Append. 2. tab. A.), where a rough figure is given of one of 
its species. Poiret also, in the Dict. Meth. vol. viii. p. 99, offers a toler- 
ably good description of the two enumerated species, and Lamarck in 
his Illustr. Tab. 114, has copied Cavanilles’ drawing of T. ambrosaica ; 
these authors correctly class the genus among the Solanaceae. Ata 
much later period it was, however, referred by Don to the Nolanacea, 
evidently from a misconception of its fruit; but by Endlicher and other 
botanists, it has since been placed at the end of Solanacee, as a doubtful 
genus of the order. Indeed nothing certain seems to have been known 
of its structure, and it is strange that a plant, apparently widely diffused 
throughout the south of Spain, should have altogether escaped the notice 
of all botanists except M. de Boissier, during the last forty years; it 
seems at all events to have been quite unknown to English botanists, 
not a single specimen, so far as I can trace, having existed in any 
British herbarium. I have been fortunate in obtaining much satisfac- 
tory information on this subject, and feel greatly indebted to M. de 
Boissier, whom I had the pleasure of seeing this summer in Geneva, 
for the kind and generous manner in which he opened to me the con- 
tents of his rich herbarium, and for his liberality in giving mea 
specimen of Triguera ambrosaica, from which I have made the following 
analysis. Triguera, from the facts thus collected, will be seen to be 
not only a truly Solanaceous genus, but one closely allied to Solanum : 
in the structure of its stamens, and their arrangement upon the outside 
p. 83. tab. 8) under the name of Pionandra (now the Cyphomandra of 
Dr. Sendtner) ; but it differs from that genus in the form of its corolla, 
in its seeds, and its distinct habit. In this respect it also resembles the 
genus Ectozoma, which I have founded upon a plant from Peru, that 
has its stamens fixed in like manner, upon à free epipetalous ring. 
Ectozoma, however, has a corolla with an imbricate estivation, and 
therefore belongs to the Atropacee, where it is placed in the tribe of 
the Solandrea, near Juanulloa Es Nat. Hist. 2nd Ser. vol. iii. 
VOL. I. 
