DICOTYLEDONES— CALYCIFLOR^ 



365 



Synopsis of the British Natural Orders in the Series CalyciflorcB. 



A. Corolla polypetalous. Ovary superior. 



1. Ovaries many, distinct or united, each with a 



style ; or solitary with one lateral placenta. 

 Corolla regular. 



Sepals combined below. 



Stamens equal to or double the number of 



the petals ; no stipules . . . CrassulacecB. 

 Stamens 20 or more, perigynous. Leaves 



stipulate BosacecB. 



Corolla irregular. 



Leaves with stipules. Stamens mono- or dia- 



delphous Leguminosce. 



2. Ovary solitary, with parietal j)lacentation. 

 Corolla regular. Sepals equal, free, imbricate. 



Stamens 5 Droseracece. 



3. Ovary solitary, with central i^lacentas. 

 Calyx valvate in the bud. 



Stamens inserted in the calyx tube below the 



petals Lythracece. 



B. Corolla polypetalous, ovary partly or wholly 



inferior. 



1. Ovary 1-celled. Placentas 2, j)arietal. Ovules 



numerous Rihesiacece. 



2. Ovary 2 — many-celled. Placentas central. 

 Stamens as many as the petals, or twice as 



many. 

 Petals imbricate in the bud. 



Petals 5. Stamens 5. Flowers in umbels Umbelliferce. 



Petals 4 — 5. Ovary only partially inferior. 



Capsule 2-valved Saxifragacece 



Petals i. Stamens 4 — 8. Fruit, 4 nuts . Haloragacece. 

 Petals valvate in the bud. 



Fruit a beiTy. Styles more than 2 ; leaves 



alternate Araliacece. 



Fruit a drupe. Style 1 ; leaves opposite Cornacece. 



Fruit a cremocarp Umbelliferce. 



Petals twisted in the bud. 



Sepals valvate Onagracece. 



C. Corolla gamopetalous. 



Flowers unisexual Cucurhitacece. 



D. Corolla wanting. 



Flowers monoecious. Stamens solitary. Ovary 



4-celled Callitrichacece. 



