1915] 



BESSEY — PHYLOGENETIC TAXONOMY 153 



Family 223. Oenotheraceae. Evening primroses. Herbs 

 (shrnbs and trees) with opposite or alternate leaves, and 

 perfect, 2-3^-merous, regular flowers; stamens 1-8, rarely 

 more; pistil usually 4-celled, inferior; ovules 1 to many 

 on axile placentae; endosperm scanty or 0. Epilobium, 

 Anogra, Oenothera, Meriolix, Gaura, Fuchsia, Circaea. (Pf. 

 3 7 :199.) 



Family 224. Halorrhagidaceae. Aquatic or terrestrial 



herbs with opposite or alternate leaves and perfect or im- 

 perfect, sometimes apetalous flowers; pistil 1-4-celled, in- 

 ferior; ovules solitary, pendulous; endosperm present. Hal- 

 orrhagis, Myriophyllum. (Pf. 3 7 : 226.) 



Family 225. Hippuridaceae. Aquatic perennial erect herbs, 

 with whorled leaves, and small, reduced, axillary apetalous 

 flowers; ovary 1-celled, 1-ovuled; endosperm scanty. Hip- 

 puris. (Pf. 3 7 :237.) 



Family 226. Cynomoriaceae. Parasitic rhizomatous fleshy 

 plants with spicate, small, apetalous, diclinous flowers, each 

 with a single ovule; endosperm fleshy. Cynomorium. (Pf. 



3 1 :250.) 



Family 227. Aristolochiaceae. Dutchman 's-pipes. Her- 

 baceous or shrubby plants, with alternate leaves and large, 

 apetalous, perfect, irregular flowers ; stamens 6, rarely more ; 

 pistil 4 or 6-celled, inferior; ovules numerous, on axile (or 

 protruding parietal) placentae; endosperm copious. Asarum, 

 Aristolochia. (Pf. 3 1 : 264.) 



Family 228. Rafflesiaceae. Fleshy, parasitic herbs, of warm 

 climates, leafless, or nearly so, with mostly imperfect flowers ; 

 petals 0, or rarely 4; stamens 8 to many; pistil 1-celled or 

 imperfectly many-celled, inferior; ovules minute, very num- 

 erous, on parietal or pendulous, folded placentae ; endosperm 

 present. Rafflesia, Cytinus. (Pf. 3 1 :274.) 



Family 229. Hydnoraceae. Parasitic, succulent, tropical 

 herbs with perfect, 3-4-merous flowers; perianth single, val- 

 vate; stamens 3^4, but anthers many; seeds very numerous; 

 endosperm copious. Hydnora. (Pf. 3 1 :282.) 



