338 THE LOWER DICOTYLEDONS. 



24. Write an account of the fruits of Cruciferae, noting any peculiar 

 forms or methods of seed-dispersal, with sketches. 



25. Note any points of interest connected with the following plants : 

 Shepherd's Purse, Candytuft, Hairy Bittercress, Sea Rocket, Honesty, 

 Dame's Violet, Garlic Mustard, Vernal Whitlow-grass. 



26. Describe the flower of a Poppy and its adaptations for pollination. 



27. Describe the Horned Sea Poppy and the Greater Celandine. In 

 what habitats do these plants grow, and how do they differ from the 

 Field Poppy ? 



28. Describe the fruits of Poppy and Greater Celandine, pointing 

 out the adaptations for seed dispersal. 



29. Describe carefully the structure of a Rose flower. Why is the 

 Dog Rose called a "pollen-flower"? 



30. Explain clearly the differences between the prickles of Roses or 

 Brambles and the spines of Hawthorn or Sloe. 



31. Describe and compare, giving sketches, the fruits of Rose and 

 Strawberry. 



32. Describe the different kinds of leaves on a Strawberry plant. In 

 what respects does a cultivated Strawberry differ from the Wild Straw- 

 berry ? 



33. Compare, by means of a series of sketches with the parts labelled, 

 the fruits of Cherry, Bramble, Strawberry, Potentilla, Avens, Agrimony, 

 Rose, Hawthorn, Rowan, and Apple. Deal only with fruits you have 

 actually examined. 



34. Mention the commonest species of Potentilla, noting the dis- 

 tinctive characters of each, the months when each is most abundant in 

 flower, and the habitat in which each occurs. 



35. Give diagrams with brief descriptions, showing the variation in 

 the form of the ovary and receptacle in the Rosaceae. Give examples 

 of each case. Name the chief British genera of this order. 



36. Describe the inflorescence and flower of Cow Parsnip. How are 

 the flowers pollinated ? 



37. Describe examples of Umbellifers (two in each case) which grow 

 (a) in woods, (b) in hedgerows, (c) beside streams, (d) at the seaside. 



38. How do the following Umbeliifers differ from the rest of the 

 family ? Wood Sanicle, Water Pennywort, Sea Holly. 



