8 MR. G. D. HAVILAND: REVISION OF THE NAUCLEEZ. 
Mitragyna, in which they are truly valvate. In some species of 
Adina the overlapping of the lobes is very slight indeed, but the 
lobes are not valvate as they are in Mitragyna. In all species of 
Uncaria the lobes are strongly imbricate ; and it must have been 
due originally to some clerical error that they are called valvate 
in Bentham and Hooker’s ‘ Genera Plantarum.’ 
The style is long, from 13 to 3 times the length of the corolla- 
tube. The stigma is always capitate, though it varies in shape, 
and may be clavate, subglobose, spindle-shaped, or mitrate, and 
provides valuable characters for generic grouping. When clavate 
or subglobose, the papillose arca is on the top: when spindle- 
shaped, there are two distinct papillose areas which are almost 
in contact on the lower half of the spindle and end below 
abruptly; on the upper half of the spindle the two papillose 
areas rapidly diverge and do not reach nearly to the top; in 
dried specimens the top of the spindle-shaped stigma shrivels aud 
becomes acute: when mitrate, the stigma is cylindrical with over- 
hanging lower margin. 
The ovary and the seeds give characters which are of great 
value for generic grouping. The ovaries are always two-celled ; 
the placentas may be long and linear, attached to the middle of 
the axis, or they may be pendulous from its upper part; the 
ovules, excepting when solitary, are more or less flattened and 
directed either upwards or downwards, overlapping one another. 
When the placentas are linear with central attachment, the 
ovules are very numerous; but when the placentas are peudulous, 
the ovules are fewer. The seeds are almost always flattened, and 
frequently the testa is produced to a great length at either end. 
When the calyx-tubes of the different flowers are united or inde- 
hiscent, a somewhat pulpy fruit is generally formed. When the 
ovules are solitary the fruits are also indehiscent, even though 
they may be free. When many ovules imbricate downwards and 
the calyx-tubes do not cohere (Nauclea and Adina), the fruits 
are dehiscent and formed of two cocci which separate from below 
upwards; the endocarp is not separable from the inferior calyx ; 
the axis may persist after the falling of the cocci; the superior 
portion of the calyx may fall with the cocci, or it may persist as 
à crown to the axis. When all the ovules imbricate upwards 
the fruits are dehiscent, and the eudocarp is coriaceous and 
Separates from the inferior calyx ; when the placentas are pen- 
dulous (Mitragyna), the capsules open at the top and the seeds 
