LÀ 
548 Mr. Miers on some new Brazilian Plants 
masses, according with the description given of that of Dictyostega. That 
portion of the ovarium invested by part of the perianthium is of an oblong 
Shape, tapering at its base, and of a deep reddish-purple colour, but the 
upper portion is free, of a pale colour, and tapers upwards in the form 
of a sharp cone, from the summit of which rises the erect filiform style, 
which attains the height of the stamens, and then divides into three very 
divaricate, sigmoid stigmata, each of which forms at its extremity a some- 
what upright funnel-shaped cup, with an oval orifice, drawn together on 
the two sides, and filled with a yellowish viscid fluid. The capsule very 
much resembles that of Dictyostega, but the seeds are different: they are 
oblong, quite opake, of a yellowish-brown colour, and suspended by a slen- 
der umbilical cord. The testa is marked with very prominent reticulations, 
appearing by a common lens as if covered with twisted longitudinal la- 
mellæ ;. but under a higher power it is seen to consist of elongated, hexa- 
gonal cells. 
The plant was found by me in the Organ Mountains, in March 1838, in a 
swampy situation under the shade of a large block of granite. 
I cannot close the enumeration of these plants without alluding to the two 
species regarded by some as distinct from Burmannia under the name of Tri- 
pterella ; the one is Tripterella cupitata of Michaux, which Von Martius con- 
siders to be the same as his Brazilian Burmannia capitata ; but judging from 
the specimen in the Herbarium of the British Museum, I am inclined to 
believe they are two distinct species: the other is Tripterella coerulea of 
Elliott and Nuttall, which is the same as Burmannia bifida of Linnæus. It 
is chiefly on the authority of Mr. Nuttall that Tripterella has been retained 
distinct from Burmannia; but as I cannot find that he has offered any evi- 
dence of an existing difference, there seems no good ground for this sepa- 
ration. 3 bi | 
From the facts now adduced, we find that the Burmanniaceæ comprise two 
very distinct groups of plants, namely, those having a trilocular ovarium with 
central placentation, and those having a unilocular ovarium with parietal pla- 
centation. The first consists only of the two genera, Burmannia and Gony- 
anthes ; the second contains four genera, viz. Dictyostega, Cymbocarpa, Apteria 
and Gymnosiphon: that they are all very elosely related there cannot be any 
