152 SUMMER FLOWERS. 



ttt Leaves 'pinnate, without tendrils. 

 X Pod bursting J imperfectly two-celled. 



(78) Astragalus — calyx five-toothed ; keel obtuse ; pods iraper- 



fectly two-celled, the cells formed by the inflexed margin 

 of the lower suture. 



(79) Oxytropis— calyx five-toothed; keel with a narrow straight 



point ; pod imperfectly two-celled, the cells formed by the 

 inflexed margin of the upper suture. 



XX L*od indehiscent. 



(80) OnobrycMs — calyx five-toothed, nearly equal ; keel obliquely 



truncate longer than the wings; pod compressed, one- 

 celled, one-seeded. 



20. Rosaceous Plants. Rosacea. 



* Fetals four five or more. 



t Fruit consisting of one or more follicles, containing 2-6 

 seeds, and invested by a dry calyx. 



(81) Spiraea — calyx five-cleft ; stamens numerous, inserted along 



with the petals on a disk adhering to the calyx ; follicles 

 usually distinct. 



•f"f Fruit composed of numerous (rarely \-2) small nuts or 

 drupes (ortc-seeded) invested by a dry calyx. 



X Fruit and receptacle both dry. 



§ Calyx with external bracts, i.e. in two rows. 



(82) Potentilla — calyx 8-10-parted, in two rows ; stamens nume- 



rous ; styles withering ; fruits numerous, placed upon a 

 flattish receptacle. 



(83) Sibbaldia — calyx ten-parted, in two rows; stamens five; 



styles withering ; fruits five to ten. 



(84) Greujn — calyx ten-cleft, in two rows ; stamens numerous ; 

 . fruits numerous, tipped with the persistent jointed styles, 



hooked at the joint. 



