510 Floristik und Systematik der Phanerogamen. 



(Baccharls marginalis, Tessaria absinthoides, Prosopis fniticosa, 

 with introduced species of Salix, Populus, and Riibiis) ; these are 

 the pioneers of the forest, b) Bankfoot colonisers, chiefly grasses 

 (Eragrostis, Paspalum, etc.) which grow from the river-bank into 

 the march, as Phalaris does in Europe. c) Colonists in shallow 

 water (e. g. Junciis imbricatiis, var. Eleocharis bonariensis Nees, 

 etc.). d) Colonists in deep water. (Scirpiis Americanus Poir. etc.). 

 e) The march-fiUing series, which convert marsh to firm ground 

 (Jiincus, Alopeciirus, Carex spp.). f) Small prostrate mud-plants 

 (Nertera depressa. CallUriche turfosa etc.). g) Submerged, swim- 

 ming, or floating plants. 



The process of formation of new land in the La PI ata estuary 

 is also outlined. W. G. Smith (Leeds). 



Sprague, H. A., A re Vision of Acrldocarpus. (Journal of Botany. 

 Vol. XLIV. No. 522. June 1606. p. 192—207.) 



The paper commences with an historical summary of the work 

 «n the genus. This is followed by notes on a number of the lesser 

 known species. Up to the present date 27 species of Acridocarpus 

 have been published; of these A. angolensis, A. galpliimiaefoUus 

 and A. pruriens have long been known to constitute the genus 

 Sphedamnocarpus. A ? argyrophyllus Juss. is certainly not a species 

 of Acridocarpus and is probably referable to Triapsis. (Of the 

 remaining 23 species three are reduced (viz. A. Cavanillesii = A. 

 plagiopterns Guill. et Perr. var. Cavanillesii Planch. MS. in Herb. 

 Mus. Brit. ; A. giiineensis A. Juss. = A. corymbosus Hook, fil.; A. 

 brevipetiolatus Engl. = A. longifolius Hook. fil. = A. guineensis 

 Hook. fil. non Juss. = A. Smeathmanni var. Diisenii Engl. = A. 

 Smeathmanni Oliv, pro parte; the second name in each case being 

 the one retained as specific in the revision). Twenty species thus 

 remain to which three new ones are added. This section is followed 

 by a few general remarks, a table for the determination of the 

 species and a list of the latter. Acridocarpus belongs to the tribe 

 Pyramidotorae, being the only genus with alternate leaves in the 

 tribe. The best specific characters are afforded by bracts and brac- 

 teoles, the glands on the calyx and shape and reticulation of the 

 leaves. The three new species are as follows: 



A. congolensis (near A. corymbosus Hook. fil. but with papery, 

 not closely reticulate leaves); A. ugandensis (differs from A. nata- 

 liiius A. Juss. in its spreading elliptical-oblong leaves, 4 — 75 cm. in 

 breadth); A. hemicyclopterus (differs from A. plagiopterus Guill. et 

 Perr., A. macrocalyx Engl., etc. in its subulate bracts). 



F. E. Fritsch. 



Sprague, T. A., Bignoniaceae americanae novae. (Bull. herb. 

 Boiss. T. VI. 1906. p. 371—376.) 

 Diagnoses latines de: Arrabidaea Bangii Spr., A. panamensis 

 Spr., A. Trailii Spr., A. pachycalyx Spr., A. Pullei Spr., Anento- 

 paegma surinamense Spr., A, Parkeri Spr., Memora hilabiata Spr., 

 Crescentia Donnell-Smithii Spr. A. de CandoUe. 



Vaccari, L., II „Sempervivum Gaudini" Christ e la sua distri- 

 buzione nelleAlpi. (Annali di Bot. III. 1905. p.21— 41. Tav.IX.) 



Aprfes avoir ddcrit le Sempervivum Gaudini Christ, l'auteur 

 montre quels sont les caracteres par lesquels en diffferent les especes 



