The cause of plagiotropy in maritime shore plants 



5 



In the following plant lists the species showing plagiotropy either of stems 

 and branches or of the leaves — as in the case of rosette-plants — are preceded 

 by an asterisk. 



1. Torekov, north of Kullen (7i5 17). Gently sloping beach, with some pebble 

 collected in tiie lower supralittoral belt and landwards bounded by an epilittoral dune. 



Lower supralittoral belt 



Aster tripoUuni 



* Atriplex longipes Dkej 



* Chenopodium glancum 



* » rubrum 



* Glaux maritima 



* Glyceria maritinui 



* Planfago maritima 



* Spergula salina 

 Triglochin maritimum 



Upper supralittoral belt; 



Atriplex prostratum Bough 



* Cakile marilima 



* Chenopodium album 

 Crambe maritima 



Halianthus peploides 



* Polygonum avicidare 



* Salsola Jccdi 



Epilittoral belt: 



* Artemisia campestris 

 Carex arenaria 

 Elymus arenaritts 



* Galium verum 

 Halianthus peploides 



* Hieracium umbellatum var. dunense 



* Leonfodon auitimnalis 



Psamma arenaria 



* Rumex cris pus 



* Salsola kali 



* Taraxacum officinale 

 Triticum repens 



» junceum 



2. The following species, some of which show excellent plagiotropy, are typical 

 of the west side of Hallands Väderö, in the upper supralittoral belt: 



Angelica litoralis 

 Crambe maritima 



* Galeopsis tetrahit 



* Galium aparine 

 Haloscias scoticum 



* Leontodon autimmalis 



* Lotus corniculatus 



* Polygonum convolvulus 



* Rumex crisp us 

 Sedum maximum 

 Senecio silvaticns 



* Silène maritima 



* Solanum dulcamara f. marinum 



Higher up on the beach follow the gnarled and depauperate epilittoral Alnus- 

 woods which run out in tongue-shaped strips between the cliffs. These latter are 

 often covered by espalier-shaped forms of Juniperus communis, Prunus spinosa, and 

 Cotoneaster integerrima. The following herbs are common in these localities: 



