FODOSTEMEJE CALLISTRICHINE.E SAURUREJE. 311 



1 M Alba. Mona?cious. A small tree. Lwtva deeply cordaic, unequal 

 at the base, unequally serrate, nearly glabrous. M'hitt Mulberry. 



^2 May. Introduced. 



2 M Rc^RA. Dia?cious. A large tree. Leaves cordate, ovate, acumi- 

 nate, serrate, scabrous, pubescent beneath. Penanth 4-parted, becoming 

 juicy. 



>2 March. Rich soils. 20-60 ft. 



Order CXXPVIII. PODOSTEME^. 



Flowers naked, moncEcious, bursting through an irregularly 

 lacerated spathc. Stamens hypogynous, monadelphous, 2, 

 or more, alternately sterile and shorter. Oi'ar^2-celled, with 

 numerous ovules. Stiirma3 2-3. Fruit capsular. Seed nu- 

 merous, minute. Aquatic plants, with capillary leaves. — 

 Flowers minute. 



Gemjs I PODOSTEMUM. 



Genus the same as the order. 



1 P Ceratophtllum Stem floating, filiform. Leaves alternate, pinnate, 

 many cleft Flowers axillary, solitary. Stamens 2, affixed to a common 

 pedicel. Stigmas 2, sessile. Capsule ovate, 2-valved, 2-celled, many seeded. 

 % July. In the beds of rivers. 



Order CXXXIX. CALLITRICHTNE^. 



/'/otrer* perfect, with 2 fistular, colored bracts. Stamens 1. 

 Anther reniform, l-cclled. Ovary solitary, 4-cornered, 4- 

 celled. Ovules solitary. Styles 2, subulate. Stigmas sim- 

 ple points. Fruii indehiscent, 4-cellcd, 4.seeded. Seed pel- 

 tate. Small aquatic, herbaceous plants. Flowers axillary, 

 solitary, very minute. 



GE.VI7S 1 CALLITRICHE. 



Grenus the same as tlie order. 



1 C HcTEROPHYLLA. Stem floating, creeping, round. Floating leaves, 

 spatbulate, immersed ones, linear, all opposite, sessile, entire. Penanth per- 

 sistent, lanceolate, white. Filament B\ibu\&te- S<y^ 2, subulate. 

 % May — June. Still waters. 



Order CXL. S.\URUREiE. 



Flowers naked, seated upon a scale. Stamens 6, hypogy- 

 nous, filaments slender. Anthers cuneale. Ovaries 4, dis- 

 tinct, each with 1 ovule. Stigmas 3-4. Fruit consisting of 

 4 indehiscent nuts. Herbaceous plants, growing in marshy 

 places. Leaves alternate, stipulate. Flowers in spikes. 



