274 BRITISH FLOWERING PLANTS chap. 



case they must no doubt be regarded as distinct 

 species. The plant is glabrous, with a quadrangular 

 stem ; the leaves bear black dots. The stem has water 

 furrows, which start from the intervals between the 

 leaves. 



A. tenella. — Here the pistil projects beyond the 

 anthers, so that self-fertilisation seems unlikely. The 

 tube of the flower is almost filled by the woolly hairs 

 of the stamens. The stem is quadrangular and glabrous. 



Centtjnctjltjs 



The capsules open transversely, as in Anagallis. 



C. minimus. — The flowers, according to Kerner, are 

 only open between 10 and 11. In the island of Fohr, 

 Knuth found them to be cleistogamous. The plant is 

 glabrous. 



Samoltjs 



The capsule opens in five valves. 



S. Valerandi. — A glabrous plant growing in Britain, 

 generally near the sea. The ovary has a ring at the 

 base which resembles a nectary, but apparently secretes 

 uo honey. The anthers are at the same height as the 

 stigma, and open inwards, so that the flower can easily 

 fertilise itself 



LENTIBULAEIACE^. 

 Corolla two-lipped. Stamens 2. 



Utricularia (Bladderwort). 



Calyx deeply two-lobed. Corolla spurred. Capsule 

 globular, opening in two valves. Our species of the 

 genus are all floating plants, without roots, and with 

 leaves divided into capillary branches, bearing little 

 bladders or utricles, whence the name. As in so many 



