KEY TO THE NATURAL ORDERS. 
XXIX 
72. Thymeleace/E. Leaves without stipules. Stamens 8. 
71. Polygonace*. Leaves with stipules sheathing the stem. 
ft Calyx not petal-like. Leaves with stipules. 
71. Polygon ace*. Stipules sheathing the stem. 
2G. Rosace*. Stipules attached to the petiole. 
79. Urticace*. Stipules deciduous. 
+ft Calyx not petal-like. Leaves without stipules. 
§ Terrestrial herbs. 
70. Scleranthace.e. Calyx contracted round the fruit. 
08. Amaranth ace*. Calyx free. Stamens hypogynous. Fruit opening transversely. 
69. Ciienopodiace*. Calyx free. Stamens perigynous. Fruit indehiscent. 
§§ Aquatic plants. 
78 . Ceratofiiyllace.e. Stamens 12 or more. 
28. Haloragace*. Stamens 1-8. 
ENDOGENS. 
Stem without distinct wood and bark. 
Leaves usually with parallel veins. 
Embryo with 1 cotyledon. 
Parts of the flower usually 3 or its multiples. 
Leaves with netted veins. 
87. Dioscoreace*. A climbing herb. Leaves alternate. 
88. Trilliace*. An herb. Leaves in a terminal whorl. 
98. Ausmace.e. Leaves radical. 
Leaves with parallel veins. 
* Flowers with distinct calyx and corolla. 
98. Alismace.e. Ovaries several, superior. 
89. Hydrocharidace.e. Ovary 1, inferior. Dioecious. 
90. Orciiidace*. Ovary 1, inferior. Stamens and pistil united. 
** Flowers enclosed in a perianth, 
f Ovary inferior. 
90. Orchidace*. Flowers irregular. Stamens and pistil united, obscure. 
91. Iridace*. Flowers regular. Stamens 3. 
92. Amaryllidace.e. Flowers regular. Stamens 6. 
ft Ovary superior. Perianth petal-like. 
93. Liliace.e. Stamens 6. Anthers opening inwards. Style entire. 
94. Melanthace.e. Stamens 6. Anthers opening outwards. Style divided into 3. 
96. Juncace.e (Narthecium). Stamens 6. Perianth becoming dry and scale-like 
when withered, persistent. 
97. Butomace.e. Stamens 9. Flowers in an umbel. 
95. Restiace.e. Flowers in a compact scaly head, monoecious. 
ttt Ovary superior. Perianth dry and scale-like. 
96. Jcncace*. Fruit a capsule. Flowers in panicles or clusters, with a bract 
beneath. 
102. Orontiace.e. Fruit a berry. Flowers arranged in a spike, springing from 
the leaf. 
100. Typjiace.e. Flowers in globular heads. Monoecious. 
