Band 135. Nr. 25, XXXVIII. Jahrgang. II. Bd. Nr. 51. 



Botanisches Centralblatt 



Referierendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten: des Vice- Präsidenten : des Secretärs: 



Dr. D H. Scott. Prof. Dr. Wm. Trelease. Dr. J. P. Lotsy. 



und der Redactions-Commissions- Mitglieder: 



Prof. Dr. Wm. Trelease, Dr. C. Bonaventura, A. D. Cotton, 



Prof. Dr. C. Wehmer und Mag. C. Ghristensen, 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



No. 25. 



Abonnement für das halbe Jahr 15 Mark 



durch alle Buchhandlungen und Postanstalten. 



1917. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Rädaction des Botanischen Centralblattes, Haarlem (Holland), Spaarnei?. 



Small, J„ On the Floral Anatomy oi so vae Compositae. {L.inrv. 

 Soc. Journ. Bot. XLIIT. p. 517—525. 4 text figs. 1917.) 



In a brief review of the literature the author shows that, ex- 

 cept in the Cichoriae, no complete study of the vascular System 

 of the flower of the Compositae appears to have been made. In the 

 present memoir detailed descriptions are given of the vascular ana- 

 tomy of the tubulär florets of Senecio vulgaris, the ligulate florets 

 of Taraxacum officinale and the tubulär and bilabiate florets of 

 Calendula officinalis and Tussilago Farfara. In the cases of Senecio 

 and Tussilago excellent diagrams are given showing a reconstruc- 

 tion of the vascular anatomy. As an example of the author's me- 

 thod, his description of the conducting tissue of the typical tubulär 

 floret of Senecio vulgaris may be briefly cited. A Single Strand 

 from the receptacle enters the flower and spreads at the base of the 

 ovary giving what may be called the lower distributive centre. 

 From the more or less disc-shaped mass ten bundles are given off 

 to supply the wall of the ovary and a Single bündle to supply the 

 ovule. Towards the top the ten bundles fuse in pairs and a little 

 higher up there is a series of anastomoses constituting an Upper 

 distributive centre. From the centre are given off five bundles, 

 which alternate with the fused petals and, a short distance above 

 the Zone of anastomoses, divide tangentially to supply the stamens 

 and coroUa. The two bundles of the style are given off from the 

 Upper distributive centre and the anastomosing of the five main 

 bundles in this region is probably required on account of the want 

 of symmetry, five Strands dividing to give the two stylar and five 

 corolla Strands. 



Botan. Centralblatt. Band 136 1917. 25 



