SYNOPSIS OF THE NATURAL ORDEKS. XXXVli 



Leaves parallel-veined, persistent. Floral envelopes 

 whorled, or none 64 



Leaves parallel-veined, persistent. Floral envelopes 

 imbricate, bractlike 75 



63 Perianth interior. Flowers perfect . .Ixxx. Trilliacece. 

 Perianth superior. Flowers dioecious. 



Ixxxi. Dioscoreacece. 



64 Ovaries several, each bearing a style or stigma 65 



Ovary 1, inferior ". 66 



Ovary 1, superior 69 



65 Perianth 4-pavted ? inconspicuous or none. 



xcv. Potamogetonacece. 



Perianth 6-parted, conspicuous. Carpels not opening. 



Ixxxvi. Alismacea. 



Perianth 6-parted, conspicuous. Carpels opening at 

 their inner edge Ixxxix. Melanthacece. 



66 Stamens and style united in a central column. 



Ixxxiii. Orchidacece. 

 Stamens free from the style 67 



67 Perianth wholly petal-like 68 



Three outer segments of perianth resembling an herba- 

 ceous calyx Ixxxii. Hydrocharidacece. 



All the 4 segments of perianth resembling an herba- 

 ceous calyx xl. Loranthacece. 



68 Stamens 3. Anthers bursting outwards. 



Ixxxiv. Iridacece. 

 Stamens 6. Anthers bursting inwards. 



Ixxxv. Amaryllidacecs. 



69 Perianth like a corolla of 6 petals. Flowers perfect . . 70 

 Perianth more or less glumaceous, or partly coloured 



or wanting 71 



70 Perianth petal-like, conspicuous. Fruit dry, bursting 



with 3 valves Ixxxviii. Liliacece. 



Perianth petal-like, conspicuous. Fruit succulent, not 



bursting Ixxxvii. Asparagacece, 



Perianth herbaceous, scale-like. Fruit baccate, not 



bursting xciii. Aracece (Oronteae). 



71 Flowers perfect. Perianth 6-parted. Stamens 6. 



xc. Juncacece. 

 Flowers monoecious 72 



72 Flowers on a spadix 73 



Spadix wanting 74 



Flowers solitary xcvi. Naiadacea. 



73 Flower on a thick spadix. Spath wanting. Anthers 



wedgeshaped, erect ; tilaments long. 



xcii. Typhacea. 



