XVIII. CISTINE.E. 



239 



Helianthemum. 

 Flower. 



TlelianthemuiH. 

 Flower without its corolla (inag.). 



Helianthemum. 

 Vertical section of flower (mag.). 



Helianthemum ytittatum. 



Cist us Ladanum. 



Seed, entire and cut Helianthemum. 



vertically (mag.). Pistil (mag.). 



Ifetianthemum. 

 Diagram. 



Helianthemmm. 

 Stamen (mag.). 



placentiferous septa only united at the 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 3-5 half-placentiferous valves. SEEDS with crustaceous testa, and floury 

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

 rarely nearly straight (Leched) ; liilum and chalaza contiguous, diametrically opposite 

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

 seed. 



* Cistus. 



GENERA. 

 'Helianthemum. Hudsonia. Leehea. 



Cistinefe are near Droseracea;, Violnrica; and liixine<n in polypetalism, placentation, capsular fruit 

 with seminiferous valves and albuminous seeds ; they are polyandrous like Bixinea and Dionfra, and the 



