CONTRIBUTIONS TO BOTANY. 
85 
mora, and some other genera. In both these species of Tanaecium 
the valves split down the middle, as in Distictis and Haplolo- 
phium, and a similar replum detaches itself on each side along 
the main sutural line of dehiscence. The hilum in T.prcelonyum 
is considerably cuiwed, and broader, owing to the more thickened 
margin of the seed on that side, and it lies at a right angle with 
the axis of the fruit ; in T. albiflorum, on the contrary, the hilum 
lies parallel with the axis, when the radicle is therefore centri- 
fugal, while in T. pralongum it points a little outwards to the 
base of the fruit. There is, however, another essential difference 
to be noticed in these two developments : in the one, the seeds, 
from their mode of attachment, are pressed and twisted half 
round, in several series on each side beyond the dissepiment ; in 
the other they are 2-serial, appearing almost uniserial, owing to 
their different direction and to the greater length and breadth of 
the hilum. 
Tanaecium. therefore, fully corresponds with the conditions of 
the Eubignoniece ; and from the peculiar shape of its large hand- 
some flowers, as well as of its capsule and seeds, it forms one of 
the most interesting genera of the family.- Its place is certainly 
close to Adenocalymna. The generic diagnosis, in accordance 
with the facts stated, is therefore remodelled, entirely from my 
own observations, in the following manner : — 
Tanaecium, Sw. {in parte). — Calyx tubulosus, margine integro, 
ciliolato, nervis extus in denticulos 5 excurrentibus. Corolla 
valde elongata, anguste tubulosa, apicem versus paulo am- 
pliata et infundibuliformis, limbo expanso 5-fido, laciniis sub- 
aequalibus, 2 superioribus erectioribus, 3 inferioribus reflexis, 
sestivatione valde imbricatis. Stamina 4 didynama cum 
sterili; filamenta filiformia, subulata, glabra, summum versus 
tubi inserta, inclusa; anthera 2-lob8e, lobis linearibus, sagit- 
tato-distensis, aut divaricatissimis. Ovarium conico-oblongum, 
glabrum, disco carnoso cylindrico sulcato insidens, 2-loculare, 
pluri-ovulatum ; ovula in extremis marginibus dissepimenti 
utrinque pluriseriata. Stylus flliformis, longitudine tubi co- 
rollse. Stigma 2-lamellatum, lamellis oblongis, obtusis, mem- 
branaceis, glabris. Capsula magna, late cylindrica, botuli- 
formis, 2-locularis, 2-valvisj valvce lignosae, medio longitudi- 
naliter fissiles; dissepime7itum (e lamellis 2 eonfluentibus) 
chartaceum, valvis parallelum, aut marginibus placentiferis ad 
parietem internum valvarum utrinque inflexis, ibi primuni 
agglutinatis et demum solubilibus, vel marginibus semini- 
geris ad parietem valvarum permanenter conglutinatis et 
rima utrinque a dissepimento erumpentibus. Semina tunc e 
diversa evolutione placentarum, in uno casu ad dissepimentum. 
