10. KEY TO THE FAMILIES. 



Perianth of calyx and corolla, with petals united at least at 

 the base. (METACHLAMYDEAE or SYMPETALAE). 



275 



31. Perianth wanting or simple. 32. 



Perianth differentiated into calyx and corolla. 111. 



3a. Perianth absent in the hermaphrodite and female flowers, but 



sometimes replaced by bracteoles. 33. 



Perianth present in the hermaphrodite and female flowers. 42. 



33. Ovary 1 celled. 39. 

 Ovary 2-4 celled. 4O. 



34. Ovule 1. 35. 

 Ovules numerous. 39. 



35. Ovule pendulous (Figs, and Indian Hemp). 



32 MORACEAE. 

 Ovule basal or attached by a basal funicle. 36. 



36. Ovule incurved. Embryo curved. Stigmas 2-5. Fruit dry. 

 Flowers usually in glomerules or spike-like cymes. 



39 CHENOPODIACEAE. 

 Ovule straight. If fruit dry, then stigma 1. 37. 



37. Flowers in fascicles. Stigma 1. Fruit dry. 33 URTICACEAE 

 Flowers in spikes. Fruit succulent. 38. 



38. Shrub. Flowers unisexual, stigmas 2. Fruit a drupe. 



Leaves exstipulate. (Myrica). 30 MYRICACEAE. 



Herbs or under shrubs. Flowers hermaphrodite, or, if uni- 

 sexual, then leaves stipulate. Fruit a berry. 



28 PIPERACEAE. 



39. Trees or Shrubs (Salix). 29 SALICACEAE. 

 Aquatic Herbs (Hydrostachys). 59 HYDROSTACHYACEAE. 



40. Numerous ovules in each ovary cell. Styles 3-4. 



64 MYROTHAMNACEAE. 

 Ovules solitary in each ovary cell. 4I. 



41. Ovary 2-3 celled. 80 EUPHORBIACEAE. 

 Ovary 4 celled. Styles 2 stamen 1. 81 CALLITRICHACEAE. 



42. (32) Ovary superior, or nearly so. 43. 

 Ovary inferior or half inferior. 97. 



43. Ovary 1 entire or lobed. 44. 

 Ovaries 2 or more, distinct or united at the base only. 93. 



44. Ovary 1 celled. 45. 

 Ovary 2 or more celled. 73. 



45 Ovule 1. 46. 



Ovules 2 or more. 63. 



46.0vule erect or ascending or attached by basal funicle. 47. 



Ovule pendulous or descending. 56. 



47. Ovule straight. 48. 



Ovule incurved or inverted. 51. 



48. Styles 2-4. Fruit a nut. Herbs. 38 POLYGONACEAE. 

 Style 1 or none. Stigmas 1 or more, 49. 



