4i6 THE STORY OF PLANT LIFE 



Tribe 3. Zannichelliece.. 



Genus. Zannichellia (^ oi. Ill, p. 381). 

 Family 2. Naiadacese (Vol. Ill, p. 374). — Flowers 

 uni- or bisexual ; plant monoecious or dioecious ; male 

 flowers with two envelopes and terminal anther; female with 

 one (or no) envelope and one carpel, with one ovule. 

 Genus. Naias (Vol. Ill, p. 385). 

 Family 4. Scheuchzeriacese (Juncaginacese). — 

 Plants scapigerous ; inflorescence racemose ; flowers mono- 

 clinous or diclinous, parts 4-1 ; perianth homochlamydeous; 

 carpels with 1-2 ovules (anatropous). 

 Tribe. Triglochinece. 



Genera. Triglochin (Vol. Ill, p. 376), Scheuchzeria. 

 Sub-Order 2. AlismatinkvE. — Flowers hypogynous, 

 heterochlamydeous ; ovules on ventral suture. 



Family 5. Alismatacese. — Inflorescence branched; 

 flowers generally monoclinous, heterochlamydeous, parts in 

 threes ; stamens 3 to many ; carpels 6 to many ; styles 

 6 to many. 



Genera. Aiisma (Vol. Ill, p. 370), Elisma, Dama- 

 sonium^ Echinodorus, Sagitiaria (Vol. Ill, p. 372). 

 Sub-order 3. BuTOMiNEiE. — Flowers hypogynous, epi- 

 gynous, heterochlamydeous. 



Family 6. Butomaceae. — Inflorescence cymose or 

 umbellate ; plant monoecious, flowers heterochlamydeous, 

 parts in threes ; carpels (6 to many). 

 Genus. Butomus. 

 Family 7. Hydrocharitaceae (Vol. Ill, p. 278) — 

 Flowers unisexual, cymose or solitary, regular, usually 

 dicHnous, heterochlamydeous as a rule, parts in threes. 

 Sub-Family i. Stratiotoideae. 

 Tribe i. Sirattotecz. 



Genus. Stratioies {Yo\. Ill, p. 285). 

 Tribe 2. Hydrocharitece. 



Genus. Hydrocharis (yo\. Ill, p. 280). 



