Band 104. Nr. 14. XXVIII. Jahrgang. 1. Bd. Nr. 14. 



Botanisches Centralblatt 



Referirendes Organ 



der 



Ansociation Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 



des Präsidenten: des Vice- Präsidenten : des Secretärs: 



Prof. Dr. R. v. Weüstein. Prof. Dr. Ch. Flahault. Dr. J. P. Lotsy. 



und der Redactions-Co^nmissions- Mitglieder : 



Prof. Dr. Wm. Trelease und Dr. R. Pampanini. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J. P. Lotsy, Chefredacteur. 



No. U. 



Abonnement für das halbe Jahr 14 Mark 

 durch al}e Buchhandlungen und Postanstalten. 



1907. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Rijn- en Schiekade 113. 



Holm, Theo, The root-structure of Spigelia Marilandica L., 

 Phlox ovata L. and Ruellia ciliosa Pursh. (Am. Journ. of Pharm. 

 LXXVIII. p. 553—559. f. 1—5. Decbr. 1906.) 



The writer describes the root-structure of these plants and 

 shows that the roots of Phlox Carolina, better known as P. ovata, 

 do not contain cystolithes and sclerotic cells as described by Pro- 

 fessor Greenish. The plant in which the cystolithes were found was 

 no Phlox, but some species of Ruellia and most probably R. ciliosa \ 

 for comparison the writer examined various species of Phlox, but 

 observed no cystolithes or sclerotic cells in any of these. The rhizome 

 of Phlox is very different from that of Spigelia and Ruellia, and 

 can not very well be mistaken for Spigelia. In this the rhizome 

 shows always the cupshaped scars from the dead stems, and the 

 rhizome is horizontal and creeping. In Ruellia the rhizome shows 

 very much the same aspect, but the base of the dead stems persists. 

 While the principal structure of the root is the same in Phlox and 

 Spigelia, we find in Ruellia the very characteristic raphidines only 

 known from Acanthaceae , besides numerous large stone-cells and 

 cystolithes, which abound in the cortex. The Statement in Dr. Sole- 

 red er's „Systematische Anatomie d. Dicot. (p. 622) that Phlox Caro- 

 lina is distinguished from all the other Polemoniaceae by possessing 

 cystolithes in the root may therefore be omitted with safety. 



Theo. Holm. 



Botan. Centralblatt. Band 1U4. 1907. 23 



