110 WELWITSCHII ITER ANGOLENSB. 
r 
In the same flower two of these appendages, in place of "being bent 
downwards, stand erect, and thus snpply the pbce of the absent 
* 
sepal. 
The coroUa, under ordinary circumstances, is bell-shaped, with a 
five-parted, slightly reflected limb, each lobe of which is traversed by 
a well-mailed central rib. In the specimens in question the corolla 
seems to be wholly wanting, its place being supplied by an additional 
row of five stamens. These supernumerary stamens not only occupy 
the position usually filled by the corolla, but they are likewise interme- 
diate in form between the corolla and the anthers. Sometimes the 
filaments cohere, sometimes the anthers ; in the latter case, one of the 
anther-lobes assumes a petaloid aspect, and is united with the simi- 
larly changed half of the adjaceiit stamen. The connective corresponds 
in position precisely with the centre of each lobe of the normal corolla, 
in other words, with the median nerve that has been mentioned as 
existing in that situation. The second row of stamens, when present, 
alternates with the first, and thus represents the ordinary staminal 
whorl. The pistil does not seem to have undergone any material 
change. 
Mr, Smith has also detected an instance wherein there has apparently 
been a fusion of the stalks supporting two spadices in Arifm macula- 
tum (Fig, 12), Instances are on record of the presence of two spathes 
to a single spadix in many Arads, but, in this instance, the spadix also 
is repeated and partially united to its fellow. 
WELWITSCHII ITEH ANGOLENSE. 
{Coniimied from p. 35.) 
IV. — LEMNACEAEUM A CL. EK. WELWITSCH IN AFBICiE 
^QTJINOCTIALIS TEERITOKIO ANGOLEXSI COLLECTAKUM 
PESCRIPTIO, AIICTORE E. HEGELMAIEB. 
(Plate XXIX.) 
Lemnaceariim genera, secundum dispositionem a cl. M. J, Schleiden 
propositam (Liunsea, xiii. 385), characteribus optimis ceterum baud 
setjualis moment! definiuntur.. Cl. Schleiden, prseter ovuloinim semi- 
