30 ARKIV FÖR BOTANIK. BAND 13. N:0 15. 



inner bristles of the pappus, which are somewhat cadu- 

 cous, and by the shorter anthers. The Jamaican species differ 

 from the other ones in having the leaves not whitened beneath. 



In his »Studies» Gleason describes four new species 

 from Cuba, V. calophylla, V. vicina, V. calida and F. semi- 

 talis, which are all to be placed here. 



As well as F. arhorescens (L.) Sw. could be originated 

 from F. Trinitatis Ekman, F. divaricata has its nearest re- 

 lative in F. canescens H. B. K. of Venezuela. In habit the 

 two species are strongly alike. The most characteristic fea- 

 ture of F. canescens, the want of bracts below most of the 

 heads, is to be seen unaltered in F. divaricata. 



5. The allies of F. memhranacea Griseb. 



Three species of Cuba, F. memhranacea Griseb., F. cras- 

 sinervia Wright ap. Gleason and F. gnaphalifolia A. Rich. 

 They differ from the other Arborescentes in having very 

 short outer bristles of the pappus, only Vio — Vis ^^ length 

 of the inner bristles. A newly described species from Cuba, 

 F. desiliens Gleason, is to be placed here. 



The allies of F. memhranacea closely approach to the 

 allies of F. sericea L. C. Rich. I do not know whether they have 

 any near relative in South America. 



6. The allies of F. sericea L. C. Rich. 



Three species of Cuba, two of which are known to 

 me, F. angustissima Wright, ap. Ekman and F. commutata 

 Ekman, the third, F. corallophila recently described by 

 Gleason, one species of Hispaniola, F. stenophylla Less., 

 and one species of Porto Rico, St. Croix, St. Thomas and 

 St. Jan, F. sericea L. C. Rich., with a subspecies in Hispaniola. 

 The species in question are characterized by the shape of 

 their involucres, their stmall anthers and their, as a rule, narrow 

 leaves. 



7. The allies of F. segregata Gleason. 



One isolated species of Cuba, of puzzling habit and 

 mysterious affinities. 



As mentioned above, two keys to the species of the 

 subsection Arborescentes are appended. The first shows the 

 natural relationships of the species. In this key, of course, 

 I have not given the species recently described by Glea- 

 son, having not seen his species, nor having analyzed their 



I 



