ECOLOGY or FLOWERS 



369 



25. Yarrow . 



26. Oxeye daisy 



27. Dandelion 



28. Barberry . . . 



29. Mountain laurel 



III 



Achillea millefolium MUll. 



Chrysanthemum Leucanthemum . . . MtQl. 

 Taraxacum officinale . . . Miill., Newell. 



IV 



Berberis vulgaris Lubhock. 



Kalmia latifolia Gray. 



30. White clover 



31. Red clover 



32. Locust . 



33. Wistaria 



34. Vetch . 



35. Pea . . 



36. Bean . 



37. Ground-nut 



38. Partridge-berry . 

 '39. Primrose . . . 

 40. Loosestrife . . 



Trifolium repens Miill. 



Frifolium pratense Miill. 



Bobinia Pseudacacia Gray. 



Wistaria sinensis Gray. 



Vicia craeca Miill. 



Pisum sativum .... ... Miill. 



Phaseolus vulgaris Gray. 



Apios tuberosa . Gray. 



VI 



Mitchella repens Gray. 



Primula grandiflora, P. officinalis . Lubbock. 



Lythrum Salicaria Gray. 



41. Milkweed . 



42. Lady's-slipper . 



vn 



Ascl^ias Cornuti . 



VIII 



Cypripedium acaule 



Mtill., Newell. 



Newell. 



439. Cleistogamous Flowers. — In marked contrast with 

 such flowers as those discussed in the preceding sections, 

 which bid for insect visitors or expose their pollen to be 

 blown about by the wind, are certain flowers which remain 

 closed even during the pollination of the stigma. These 

 flowers are called cleistogamous and of course are not 



