• . KEY TO FAMILIES 



[The figures refer to the number of the Family.] 



A. Perianth wanting, or of a single series, the calyx. 



Flowers 2-sexual.... 39. Cruclia, Frioria. 



Flowers 1-sexual. 



Ovary usually 3-celled 51. Euphorhiacess. 



Ovary 4-celled .....' Callitrichacex. 



B. Perianth of a double series — sepals and petals. 



Flowers unisexual. 

 Leaves simple. 



Ovary of four carpels cohering only at the apex... 46. Castela. 



Ovary 2-3-celled 51. Euphorbiaccx. 



Leaves pinnate. 



Styles sublateral .■ 45. Zanthoxylum. 



Styles terminal 46. Simarubaccas. 



Flowers polygamous. 



Carpel one. Fruit a pod (sometimes not opening) 39. Legiiminosie. 

 Carpels more or less free, quite free in fruit. 



Styles sublateral.. -. 45. Zayithoxylum. 



Styles terminal 46. Picrivna. 



Carpels united into a single ovary. 



Ovary 1-celled 45. Amyris. 



Ovary 3-5-celled. 



Trunk u'nbranched. Stamens as. many as 



petals 45. Spathclia. 



Trunk branched. Stamens twice as many 



as petals ; 47. Burscraceas. 



Flowers 2-sexual. . 



Leaves simple or 1-foliolatc. 

 Leaves alternate. 



Fruit a pod (sometimes not opening, rarely 



drupe-like) 39. Lcguminosae. 



Fruit samaroid 50. Securidaca. 



Fruit a capsule. 



Flowers regular 42. Linutn. 



Flowers irregular 50. Polygala. 



Fruit a drupe 43. Erythroxylon. 



• Fruit baccate , ^6. Biitaccse. 



Ripe carpels 3-5, surrounded by the calyxi 46. Suriana. 



Leaves opposite. 



Leaves gland-dotted.; .' 45. Eavenia.. 



Leaves not glandular. 



Leaves palmately lobed 40. Geranium. 



Leaves entire, very rarely toothed ,. 49. Malpighiaccx. 



