Revisions of Some Plant Phyla 37 



Family 19. Eriocaulonaceae. Rush-like herbs with flowers in 

 close heads; perianth segments 6 or less, small; pistil 3- or 2- 

 celled; ovules orthotropous, pendulous. Eriocaulon. (Pf. II, 

 4, 21.) 



Family 20. Thurniaceae. South American herbs, with small, 

 i-nerved leaves, and small axillary flowers. Thurnia. (Syl- 

 labus, 94.) 



Family 21. Rapateaceae. Tall, sedge-like marsh herbs with 

 3-celled pistil ; stamens 6, in pairs ; perianth of two dissimilar 

 whorls, each of three similar leaves. Rapatea. (Pf. II, 4, 28.) 



Family 22. Naiadaceae. Slender, branching, wholly submerged 

 aquatics, with sheathing, mostly opposite leaves, and monoecious 

 or dioecious flowers. Naias. (Pf. II, i, 214.) 



Order Arales. Compound pistil, mostly tricarpellary, supe- 

 rior ; ovules more than one ; flower-leaves reduced to scales or 

 entirely wanting. 



Family 23. Cyclanthaceae. Mostly herbaceous plants with 

 broad, petioled leaves having parallel venation; pistil i-celled; 

 ovules many, on four parietal placentae. Cyclanthus. (Pf. II, 

 3, 93-) 



Family 24. Araceae. Arums. Mostly herbaceous plants with 

 broad, petioled leaves, having reticulate venation; pistil i- to 4- 

 celled; ovules i or more. Anthurium, Acorus, Monstera, Sym- 

 plocarpus, Calla, Philodendron, Calocasia, Caladium, Arum, Ari- 

 saema. (Pf. II, 3, 102.) 



Family 25. Lemnaceae. Duckweeds. Very small, floating, 

 aquatic herbs; pistil i-celled; ovules i or more. Lemna, Spiro- 

 dela. (Pf. II, 3, 1 54-) 



Order Palmales. Compound pistil mostly tricarpellary, su- 

 perior ; ovules usually one ; flower-leaves reduced to rigid or 

 herbaceous scales. (Sp. 1085.) 



Family 26. Palmaceae. Palms. Trees or shrubs with com- 

 pound leaves; pistil i- to 3-celled; fruit a i -seeded berry or drupe 



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