52 CLASS IV. ORDER I. 



69. Alchemilla. Calyx persistent, eight cleft, the 

 alternate segments smaller. Corolla none. Style 

 from the base of the germ. 



Order II. DIGYNIA. Two styles. 



70. Hamamelis. Involucre three leaved ; proper 

 calyx four leaved; petals four; nut two celled, with 

 two horns. 



71. Sanguisorba. Calyx two leaved, inferior ; co- 

 rolla flat, four cleft, superior; capsule four cornered. 



Order IV. TETRAGYNIA. 



72. Ilex. Calyx four toothed ; corolla monopeta- 

 lous ; styles none; berry four seeded. 



73. Sagina. Calyx four leaved ; petals four : cap- 

 sule four celled, four valved, many seeded. 



74. PoTAMOGETON. Calyx none; corolla four pe- 

 talled ; seeds four, sessile. 



75. RuppiA. Calyx none ; corolla none ; seeds four, 

 pedicelled. 



TETRANDRIA. 

 3IONOGYNIA. 



57. CEPHALANTHUS. 

 Cephalanthus occidentalis. Zi. Button bush. 



Leaves opposite or in threes. L. 



Button bush or river bush is a frequent ornament of the water 

 side, its insulated thickets furnishing a safe retreat for the nests 

 of the black bird (Icterus phoeniceus.) The shrub rises five or 

 six feet out of the water, its leaves are tough, spreading, pointed, 

 and entire. In the month of July it puts forth its spherical 

 heads of flowers, which at a distance appear not unlike the balls 

 of the plane tree. Receptacle globular, of the size of a large 

 pea, covered with whitish funnel shaped flowers. The long pro- 



