VASCULAR PLANTS. 91 



tion, sometimes 0. Petals 5, caducous, contor- 

 ted to the right in aestivation. Stamens oo. 

 Ovary free, formed by several connate carpidia; 

 style 1. Fruit a capsule; placentation some- 

 times apparently axillary, by placentiferous 

 septa protruding toward the centre. 



1. Helianthemum, Tournef. 



Ovary 3-valved. Placentae in the middle of 

 the valves, each valve more than 2-seeded. 



. IX . £ . flowers yellow. 



Family lx. Loasaceae. 



Calyx-tube more or less connate with the 

 ovary, costate; margin 5 — 4 parted. Petals 5 — 4, 

 and their multiples. Stamens numerous, some 

 of the outer occasionally petaloid. Ovary in- 

 ferior, 1-locular; ovules go; styles 1. Fruit a 

 capsule immersed into the calyx-tube. 



!• Mentzelia, L. 



Calyx limb 5-parted, persistent. Petals not 

 cucullate. Stamens a>, inserted into the throat 

 of the calyx below the petals. Style 3-cleft. 

 Capsule dehiscent near the apex. 



. 0. flowers yellow, orange. 



Family LXI. Datisceae. 



Calyx-tube connate with ovary. Petals 0. 

 Ovary 1-locular; placentae on the middle nerve 

 of the carpidia; ovules cc; styles on the margins 



