Floristik, Geographie, Systematik etc. 95 



bution oi' which is shown on a map. Four new species are descri- 

 bed, viz. A. väboata, A. coriacea, A. rudis and A. pachyphylla. The 

 interrelations of these and the other species are indicated in a 

 systematic key in English, a dichotomous one in Latin and by a 

 diagram. S. T. Dünn. 



Dünn, S. T., Craibia, a new genus of Leguminosae. (Journ. Bot. 

 p. 106-109. 1911.) 



The new genus in the authority for which the writer is asso- 

 ciated with Dr. Harms of Berlin is established to bring together 

 nine species of African trees, three of which had already been 

 described under Loncliocarpus, one under Millettia, the remainder 

 being previously undescribed, viz. C. Simplex, C. atlantica, C. Ellioti, 

 C. Brownii and C. filipes. The peculiar characters by which these 

 species are naturally connected and their distinction from allied 

 genera are indicated. S. T. Dünn. 



Dünn, S. T., Dipentodon. A new genus of uncertain syste- 

 matic position. (Kew Bull. misc. Inf. p. 310 — 313. 1911.) 



Dipentodon iinicus, Dünn is described and its systematic position 

 discussed. It is provisionally placed in Celastraceae but its anomalous 

 characters, which are elucidated by a figure in the text, do not 

 approach those of any previously described genus. S. T. Dünn. 



Dünn, S. T., Spatholirion. (Kew Bull. misc. Inf. p. 161 — 162. 1911.) 



The Commelinaceous genus Spatholirion, Ridley, hitherto repre- 

 sented by a Single erect herbaceous species from the Malay 

 Peninsula is extended by the addition of two scandent species 

 from south and central China, 5. scandens, Dünn and 5. longifo- 

 lium Dünn {Streptolirion longifoliiim , Gagn.). S. T. Dünn. 



Gordon, G. P. , Primitive Woodland and Plantation types 

 in Scotland. (Trans. Roy. Scott. Arboricultural Soc. XXIV. 2. 

 p. 153-177. 1911.) 



A preliminary survey of woodlands over considerable tracts of 

 Scotland enabled the author to select certain woodlands ap- 

 proaching nearest to "Urwald", that is an association of trees whose 

 development has been left principally to nature. The distinguishing 

 features of such associations are given as: inaccessible position and 

 irregulär shape of the wood; sparseness and irregularity of density; 

 abnormally large crown and diameter development with small 

 height development; unevenness of age of trees; a typical woodland 

 flora wich varies with the species composing the primitive forest. 



Birch (Betitln) "Urwald" covers the largest area and has the 

 greatest altitudinal ränge (up to 700 metres). This occurs typically 

 as irregulär Strips, thinly stocked. It may occur marginal to woods 

 of Pinus or Quercus. Several examples are described in detail: 

 some in the lowlands indicate by the ground Vegetation that they 

 were originally oakwoods; in the Highlands, numerous birchwoods 

 form the uppermost zone of tree Vegetation, and are characterised 

 by comparative poverty of the ground Vegetation. 



