NOTES ON CHANNEL ISLAND PLANTS 329 



but no intermediates of this kind were noticeable among the plants 

 I saw in Jersey. 



It has, perhaps, not been adequately pointed out that the 

 corolla characters of the British Spergularias are usually constant 

 and sufficient alone to determine the species. Of the two large- 

 flowered kinds, S. rupestris Lebel has petals of a fine lilac colour 

 (stated to be occasionally white by Linton in Fl. Bournemouth, 

 p. 55), while in S. marginata Kittel., they are normally pale pink 

 or almost white, except in a glandular form with relatively short 

 pedicels (perhaps var. glandulosa Druce), in which they are some- 

 times of a fuller pink, shading to white towards the base. Among 

 the small-flowered species, purpHsh-pink flowers with a distinct 

 white eye are characteristic of S. salina, while in *S. ruhra the 

 corollas are pale lilac or lavender, and in S. atheniensis purplish- 

 pink and concolorous. 



PoLYCARPON TETRAPHYLLUM L. var. DiPHYLLUM DC. Prodr. iii. 

 p. 376. P. diplujllum Cavanilles Icones, ii. p. 40, t. 151, f. 1. 



Exsicc. — F. Schultz Herb. Norm. 53 bis, as P. tetraphyllum 

 forma minor condensata. 



St. Aubin's Bay, Jersey. 



This distinct-looking Polycarpon, which seems to he one of 

 the two forms noticed in Mr. Lester-Garland's Flora, p. 73, 

 matches an authentic specimen from Cavanilles in Herb. Mus. 

 Brit., and agrees well with his description if not with his some- 

 what crude figure. From typical P. tetraphyllum, which is 

 characterised by its largely tetramerous leaves and very numerous 

 flowers in a lax and much branched corymbose cyme, this variety 

 appears to differ permanently by its smaller size, fewer branches 

 w^ith generally opposite leaves, and contracted, dense terminal 

 cymes with much fewer but somewhat larger flowers. 



P. alsinifolium DC. may be distinguished by its oval rather 

 than obovate leaves and still larger flowers, with subentire and 

 not emarginate petals, and five instead of three stamens. 



In Kouy & Foucaud's Fl. de France, iii. p. 312, P. tetrajjhyUum 

 is divided into two varieties : a laxum, which corresponds with 

 the ordinary British form, and /5 densum, resembhng and perhaps 

 identical with var. diplmjllum DC, to which the authors do not 

 seem to refer. 



Hypericum humifusum L. var. decumbens Eeichb. Icon. vi. 

 p. 68 (1844). {H. decumbens Peterman.) 



Greve de Lecq, Jersey, and probably also in other 

 localities. 



This large form of H. humifusum agrees both with Peterman's 

 diagnosis of his H. decumbens (Fl. Lips. p. 565) and with 

 Eeichenbach's figure of that plant (Icones, 5176). There seems 

 little reason for referring it to var. magnum. Bastard (Fl. Maine 

 et Loire, Suppl. p. 45), which is not distinguished by acute and 

 glandular-fringed sepals but by being four times as large as the 

 type of H. humifusum in all its parts, with nearly cylindrical 

 stems. 



Journal of Botany. — Vol. 52. [December, 1914.] 2 b 



