13 



32. Anthers on distinct filaments 

 Anthers crowded in a terminal 



head ... 



33. Anthers 1-celled ... 

 Anthers 2-celled ... 



34. Sepals 2 



Sepals 3 to 5 



35. Sepals ralvate 

 Sepals imbricate ... 



36. Flowers unisexual 

 Flowers hermaphrodite or poly- 

 gamous 



37. Style single 

 Styles several 



38. Leaves dotted ; prickly shrub 

 Leaves not dotted ; tree or shrub 



without prickles or fruit only 

 prickly 



39. Fruit prickly 

 Fruit unarmed 



40. Petals free or shortly united at 



the base ; flowers herma- 

 phrodite or polygamous 

 Petals united in a tube at the base 

 flowers always unisexual 



41. Stamens hypogynous 



Stamens perigynous or superior . . 



42. Water plant 

 Land plant 



43. Plant with very large floating 



leaves ... 

 Plant with leaves submerged and 

 pinnate 



44. Leaves opposite ... 

 Leaves alternate ... 



45. Herb 



Woody plant 



46. Leaves quite entire 

 Leaves serrate or dissected 



47. Leaves serrate 

 Leaves dissected ... 



48. Woody climber ... 

 Tree or shrub 



49. Ovary 2-3-celled ; leaves not 



dotted... 

 Ovary 4-5-celled ; leaves dotted 



50. Leaves simple 

 Leaves compound... 



51. Stamens free 

 Stamens variously united 



52. Stamens equal in number to petals 



or perianth lobes 

 Stamens more or less than petals 



33. 



Sterculiaceae (p. 49). 

 Malvaceae (p. 46). 

 Sterculiaceae (p. 49). 

 Portulacaceae (p, 41). 



35. 



36. 



38. 

 Eufhorhiaceae (p. 230). 



37. 

 Tiliaceae (p. 50). 

 Ternstroemiaceae (p. 42). 

 Rutaceae (p. 54). 



39. 



Tiliaceae (p. 50). 

 40. 



Ternstroemiaceae (p. 42). 



Ehenaceae (p. 161). 

 42. 



94 (p. 16). 

 43. 

 44. 



Nymphaeaceae (p, 33). 



Haloraginaceae (p. 102). 



45. 



50. 



46. 



48. 

 Caryophyllaceae (p. 39). 



47. 

 Elatinaceae (p. 41). 

 Geraniaceae (p. 53). 



56. 



49. 



Sapindaceae (p. 66). 

 Rutaceae (p. 54). 



51. 



74. 



52. 



54, 



62. 

 53. 



