XVIII. CISTINE^. 



239 



Helianthemuv^ 

 Flower. 



HeUanthernvm. 

 Flower without its corolla (mag.)- 



Uelianthemum. 

 Vertical section of flower (mag.)- 



Helianthemum guttatum. 



placentiferous septa only united at tlie bottom of the ovary ; placentas 3-5, parietal, 

 or fixed to the half-septa, 2— oo-ovuled ; style simple ; stigmas 3-5, free, or united in a 

 head ; ovules with short or longer funicles, usually ascending, orthotropous, or half- 

 anatropous. Capsule membranous or coriaceous, opening to the base, or above 

 only, into 3-6 half-placentiferous valves. Seeds with crustaceous testa, and floury 

 or sub-horny albumen. Embeto excentric or sub-central, bent, coiled, or folded, 

 rarely nearly straight (Lechea) ; hilum and chalaza contiguous, diametrically opposite 

 to the radicle, except in some species {Lechea), in which the funicle is adnate to the 

 seed. 



GENEEA. 

 * Cistus. * Helianthemum. Hudsonia, Lechea. 



Cist,ine<B ave near Droseracea, ViolariecB and Bixinecs in polypetalism, placentatiou, capsular fruit 

 with seminiferous valves and albuminous seeds; they are polyandrous like Bixinece and Dioncea, and the 



