Class IX. Order I. 159 



POLYGONUM SCANDENS. L. Climbing Polygonum. 



Leaves heart-shaped; stem twining, angular; seg- 

 ments of the calyx winged. 



Stem smooth, climbing 1 . Leaves petioled, heart-shaped, with 

 a deep sinus, acuminate. Branches axillary. Flowers in long 

 leafy racemes. Calyx much larger than in the last species, with 

 three broad, membranous expansions, corresponding to the an- 

 gles of the seed. Cambridge. August. Perennial. 



POLYGONUM CILINODE. MX. Running Polygonum. 



Leaves heart shaped ; stipules subacute, ciliate at 

 base, stem angular, running or climbing, roughish ; 

 calyx obtusely carinate. 



Stem purplish, running or twining, with a ring of hairs at each 

 joint ; calyx of the fruit without wings. About woods, &c. 

 July, August. Annual. 



POLYGONUM FAGOPYRUM. L. Bucku'heat. 



Racemes panicled, stem erect, unarmed ; leaves 

 heart sagittate, angles of the seed equal. 



Common buckwheat is sure to remain as a weed about lands 

 where it has been cultivated. June. Annual. 



Class IX. ENNEANDRIA. Nine stamen*. 

 Order I. MONOGYJYM. One style. 



166. LAURUS. Calyx none ; corolla six parted, 

 resembling a calyx ; nectary three glands, surround- 

 ing the germ, each ending in two bristles; inner fila- 

 ments with two glands each : drupe one seeded. 



