824 THE JOURNAL OF BOTANY 
must find a place in every reference library; the bibliography is 
very full and most carefully done, and the date of publication is 
iven i a on whic 
al 
a. its absence from the Kew Index can fully appreciate. 
still desiderate an introduction which will give some account of 
the plan and scope of - work, but we assume this will be supplied 
with the ——— 
In of oy st incerte sedis’ we find some slight 
ground for ciieion: We do not understand, for example, wh 
place here; th 
Raphanopsis of Welwitsch finds a ; the authors rightly 
i Hiern’s identification of it with hy a which is based 
upon the specimens collected and named by witsch himself ; 
where then is the uncertainty ? A reference to the somewhat 
ruda’s Brazilian Plants,’ published in 
to om ist ol uncertainties Carlotea and Skolemora, and 
would have sentae them from following the In Kewensis in 
printing the name ‘‘ Plegerina Arruda,’’ which was shown (loc, cit 
248) to have no existence apart from the Index; Mr. Jackson, in 
o sabe lenest to the ie ae takes due note of this, and of 
entification of Pleragin s Koster writes the name—with 
“ @a Miers,’”’ - in, shown (Journ. Bot. 1880, 
t we 
further reduction of these plants “‘incerte sedis”; Petalostemma 
of Robert Brown may be removed from them, as ‘ts specimen, 
so named by Brown, is Glossonema Boveanum. We note 
ole 8 
small matters, and do not detract from the value of the work as 
e. 
Jugendformen und Bliitenreife im Pflanzenreich. Von Dr. L. Dixxs. 
vo, pp. 130, tt. 80. Borntraeger. Berlin, 1906. Price 
3 M. 80 pfg. 
pER the above title Dr. Diels has brought together a number 
of sceupbe of the association of the so-called ‘‘ juvenile ” vegeta- 
tive form with the flower-bearing habit. In his botanical journey 
in West Australia the author was impressed with the number and 
variety of plants in which this phenomenon was aay and the 
examples which he describes are partly from personal observation, 
and partly collected i otanical literature. Among the latter is 
the remarkable instance of the mahogany (Swietenia Mahagoni var. 
