ORDER 136. GREENBRIER3. 305 



Analysis of the Genera. 



\ Frog'f-bit. Leaves all radical, round-cordate, spongy beneath, floating in stagnant 

 waters. Flowers dioecious, white, the fertile on short, the sterile on long (3') 

 peduncles. Berry many-seeded. LIMNO'BIUM. 



1 DUch-mw. Leaves crowded on the long submersed stems opposite or whorled, linear- 

 oblong. Periantt white, 6-parted, its base extended into a capillary tube 4-10* 

 long! Stigmas 3. In brooks and rivers. ANACH'ARIS. 



3 Ed-rjrass. Leaves all radical, grass-like in water. Flowers dioecious, the fertile white 

 one on each long spiral thread-form scape ; the sterile in clusters at the root, bu< 

 breaking away and arising to the surface to open and shed their pollen. 



VALLISNE'RIA spira'lis. 



ORDER CXXXV. PONTEDERIACE^E. Pontederiads. 



Aquatic herbs with more or less irregular perfect flowers, with the 

 }.frian1h colored, tubular, 6-parted, stamens 3 or 6, and style 1 ; 

 ovary free ; capsule 3 or 1-celled, co or 1-seeded. 



Analysis of the Genera. 



* Stamens 6, unequal. Perianth blue, 2-lipped. Utricle 1-seeded. PONTEDERIA. 1 



* Stamens 3, unequal, the lower one sagittate. Capsule 3-celled, CO-seeded. Perianth 



white or blue, 6-parted, with a slender tube. HETERANTHE'RA 



* Stamens 3, equal. Capsule 1-cdled, OO-seedod. Perianth regularly 6-parted, yellow, iU 



tube very long (2-3') and slender. Leaves grass-like, growing wholly under water. 

 Water Star-grass. SCHOL'LKRA. 



1. PONTEDE'RIA. Pickerel-weed. 



Large showy herbs growing in patches extending from the shore to 

 deep water. Leaves radical, long-stalked. Stiin or scape bearing 1 leaf 

 and a terminal spike of showy flowers lasting but a day. 



1 P. cordifo'lia. Leaves between heart-and arrow-shaped, blunt, very smooth, and shin 



ing. Scape stout, arising l-2f. above the water. Flowers violet blue, very irregular, 

 in a spike 2 or 3' long. After flowering the corolla rolls downward from the top, 

 persisting and withering on the 1-scedc-d fruit. Common. July. 



2 P. lancifo lia. Leaves lance-oblong to lance-linear, rather acute at each end. South. 



ORDER CXXXVI. SMILACACEvE. Greenbriers. 



Herbs or shrubs often climbing. Leaves reticulate- veined. Fix. dioacious ; 

 wianth 6-parted, regular, free from the 3-celled ovary. Fruit a berry. 



1. -SMILA.X. Greenbrier. 



Leaves palmate-veined, entire, petiolate, with a pair of tendrils in the 

 place of stipules. ("See Fig. 95.) Flowers greenish, in axillary umbels 



