526 Floristik, Geographie, Systematik etc. 



collected all the plants, grown on each of two test plats. After the 

 study of weeds grown among the field crop on the farmers tield 

 the author came to the conclusion that the weeds have been distri- 

 buted with reference to their height in three groups: to the first 

 (Upper) height belong Artemisia Ahsnithium, Centaurea Scabiosa etc., 

 to the second (middle) Avena fatua, Convolvuliis arvensis etc.; to 

 the third (low) Achülea Mülefoliinn , Dracocephahim thymiflorimi etc. 

 The total amount of weeds observed on the Buzuluk Experiment 

 Field, as it is to be seen on a table, given by the author, reached 

 107 species. Therc are among them 26 per cent of representatives 

 of local prairy flora, as for instance Amygdalus nana, Alyssum 

 desertorinn etc. Cnnnabis sativa is the onl}^ cultivated plant, which 

 became wild. The remainders are the common representatives of 

 weeds of the Russian black-earth. M. J. Sirks (Haarlem). 



Breümer, W. von, Aufzählung der afrikanischen Arten 

 von Wahlenbergia nebst Diagnosen der neuen Arten. 

 (Bot. Jahrb. f. Syst. LIII. p. 72-143. 3 Fig. 1915.) 



Enthält folgende Neuheiten: 



W. sessüißora nebst var. n dentata v. ßrehmer, W. Dimantii 

 A.DC. var. « glabrata v. Brehmer, W. ramifera v. Brehmer, W. 

 Ecklonii Buek var. « brevisepala v. Brehmer, W. mollis v. Brehmer, 

 W. sphaerica nebst « longifolia v. Brehmer, W.lottgisepalay.^rehmQVy 

 W. capillata v. Brehmer, W. kilimandschavica Engl. var. « intermedia 

 V. Brehmer, W. mashonica N. E. Br. var. Junodis v. Brehmer, W. 

 dentata v. Brehmer, W. miniita v. Brehmer, W. compacta v. Brehmer, 

 W. tumida nebst var. gracilis v. Brehmer, W. siibfnsiformis nebst 

 var. invohita v. Brehmer, W. tortilis v. Brehmer, TT", psanimophila 

 Schltr. var. longisepala v. Brehmer. TT^. rara Schltr. et v. Brehmer, 

 TT^. sabulosa v. Brehmer, W. lobata v. Brehmer, TF. /oZ/os« v. BrehmiCr, 

 W. Buseriana v. Brehmer, W. scopella nebst var. rotundata v. Brehmer, 

 W. brachycarpa Schltr. var. pilosa v. Brehmer, W. tomentosula v. 

 Brehmer, TT^. lobiilata v. Brehmer, TT^. acuminata v. Brehmer, W. 

 siibpilosa V. Brehmer, W. Bolusiana Schltr. et v. Brehmer, W . filipes 

 nebst var. dentata v. Brehmer, TT^. asperifolia v. Brehmer, W. acicu- 

 laris V. Brehmer, W. lycopodioides Schltr. et v. Brehmer, W. macra 

 Schltr. et v. Brehmer, W . fasciciilata nebst var. pilosa v. Brehmer, TT^. 

 virgulta v. Brehmer, W. capillifolia E. Mey. var. conferta v. Brehmer, 

 W. clavata v. Brehmer, W. sqiiamifolia nebst var. tennis v. Brehmer, 

 W. roelliflora Schltr. et v. Brehmer, W. consti'icta v. Brehmer, 

 W. fruticosa v. Brehmer, W. arabidifolia (Engl.) v. Brehmer, W. ar- 

 guta Hook. fil. var. parvilocula und longifiisiformis'\ Brehmer, W. 

 schistacea v. Brehmer, W. subrosnlata nebst var. « grandifolia v. 

 Brehmer, W. Zeyheri Buek var pyriformis und lanceolata v. Breh- 

 mer, W. cernua (Thunb.) A.DC. var. cuspidata v. Brehmer, TT^. nta- 

 culata nebst var. nuda v. Brehmer, W. clavatula v. Brehmer, W. 

 transvaalensis v. Brehmer, W. caledonica Sond. var. cyavea v. Breh- 

 mer, W. Englevi v. Brehmer, TT^. Di)iteri nebst var. rotundicapsula, 

 paucilaciniata, virgulta, elongata v. Brehmer, W. scoparia nebst var. 

 obovata v. Brehmer, W. inhanibanensis Klotzsch var. erecta v. Breh- 

 mer, W. distincta v. Brehmer, W. subtilis v. ßrehmer, TT^. riparia 

 A.DC. var. « virgulta, P etbaica, y clavata, S segregata v. Brehmer, 

 W. pseudoinhanibanensis v. Brehmer, W. obovata nebst var. « cernua, 

 ß ßssa, (^ lata v. Brehmer (j' fehlt), W. gracilis E. Mey. var. integer- 

 rima v. Brehmer, W. Schlechteri v. Brehmer, *TF, lasiocarpa Schltr. 



