APPENDIX 



447 



branches rising into the air and concealing the original prostrate 

 growth. With Tournefortia gnaphalodes the main trunk branched 

 low down close to the ground, the primary branches lying prone 

 for a distance of two and a half or three feet and rooting firmly in 

 the sand; whilst from them sprang the secondary branches, which, 

 lying prostrate at first, finally arose erect and developed leafy stems 

 two or three feet in height. With Suriana maritima the secondary 

 leafy branches were upright and three or four feet high; but the 

 main stem and primary branches for a distance of two and a half or 

 three feet were prone and firmly held by their rootlets in the sandy 

 soil. 



Note 4 (p. 188). 



On the experiments of Prof. Ch. Martins on the effects of sea-water 

 immersion on the fruits of Cakile maritima (Bull. Soc. Botanique 

 de France, tome IV., p. 324 : Paris, 1857). 



These experiments were made on the seeds and fruits of a large 

 number of plants with the object of determining the persistence 

 of the germinative capacity after long immersion in the sea ; but, as 

 I point out in my book on Plant Dispersal (p. 539), an objection 

 previously made by Thuret and Hemsley (Ibid.), the investigator often 

 leaves us in doubt, when speaking of the floating capacities, whether 

 he is referring to the initial or to the sustained buoyancy. His 

 remarks on some of the fruits, including those of Cakile maritima, 

 might lead one to suppose that germination occurred after forty- 

 five days' flotation in sea- water ; but it may be that only immersion 

 is implied, since he placed in the same category the fruits of Beta 

 vulgaris, Eryngium maritimum, Pancratium maritimum, Ricinus 

 communis, Salsola kali, etc., which, according to the observations 

 of Thuret and myself, sink in a few days. Lloyd Praeger places the 

 limit for Salsola kali at five and a half days (see Note 17). 



Note 5 (p. 227). 



On the synonymy of Sccevola plumieri, Vahl, and Sccevola 

 kcenigii, Vahl. 



Before making the acquaintance of Sccevola plumieri in the West 

 Indies I was led by the occasional application of the name Sc. lobelia 

 to both plants to infer that they were forms of one species ; and Sc. 

 kcenigii was therefore credited in my book on Plant Dispersal with 

 a distribution over the tropics of the globe. Schimper in his Indo- 

 malayische Strandflora (p. 130) was led into a similar error, since he 

 states that Sc. plumieri is distributed over most tropical and sub- 

 tropical coasts of both hemispheres. 



The exceedingly puzzling synonymy has been in recent years 

 made clear in the monograph of the Goodeniacece by Krause (Das 

 Pftanzenreich, IV., 277, 1912). The two plants, as was evident 

 to me when I first met Sc. plumieri in the West Indies, are quite 

 distinct, and could not be mistaken by any one with both before him. 

 The German author, who refers them to different subgroups of the 



