CONSPECTUS. 75 



Order 89. — Thymelace^e. — Anthers bursting longitudinally. Apetalous 

 or polypetalous. Ovule solitary ; suspended. Calyx imbricated. 



Order 90. — Ulmace.e. — Ovary of two carpels. Calyx imperfect ; divided 

 at the edge. Cotyledons thin and leafy. 



Group XXXVII. — Piperales. 



Flowers perfect, destitute^ of both calyx and corolla. Embryo minute, at 

 or near the outside of a large quantity of mealy albumen. 



Order 91. — Piperace^e. — Carpel solitary. Ovule erect. Embryo lying 

 in a vitellus. Leaves opposite or alternate, with or without stipules. 



Group XXXVIII.— Urticales. 



Flowers monoecious or dioecious, various ; sometimes in fleshy heads, but 

 seldom arranged in aments. Fruit an achenium, often enclosed in a baccate 

 calyx. Embryo large, in a small quantity of albumen. 



Order 92. — Urticaceve. — Radicle superior. Ovules solitary, erect. 

 Embryo straight, albuminous. Juice limpid. Stipules small, flat. 



Order 93. — Cannabinace^e. — Radicle superior. Ovule solitary, sus- 

 pended. Embryo hooked. Exalbuminous. 



Order 94. — Morace^e. — Radicle superior. Ovule solitary, suspended. 

 Embryo hooked. Albuminous. 



Order 95. — Artocarpaceje. — Radicle superior. Ovule solitary, erect or 

 suspended. Embryo straight. Exalbuminous. Juice milky. Stamens large, 

 convolute. 



Group XXXIX. — Amentales. 



Flowers monoecious or dioecious ; the flowers in aments, or in heads or 

 spikes. Carpels superior. Embryo small, with little or no albumen. 

 Order 96. — Altingiace^:. — Ovules indefinite. Seeds winged. 

 Order 97. — Salicace.e. — Ovules indefinite. Seeds cottony. 

 Order 98. — Myricace.e. — Ovule 1, erect. Radicle superior. 



Group XL. — Quernales. 



Flowers dioecious, amentaceous. Fruit inferior. Embryo amygdaloid, 

 without albumen. 



Order 99. — Corylace^e. — Ovary one or more celled. Ovules pendulous 

 or peltate. 



Order 100. — Juglandaceje. — Ovule solitary, erect. 



Group XLI. — Euphorbiales. 



Flowers monoecious or dioecious, not amentaceous. Fruit capsular or dru- 

 paceous, with 2 or more cells, and one (rarely two) seed in each. Embryo 

 large in an abundant albumen. 



Order 101. — Eufhorbiace^e. — Ovules definite, suspended, anatropal. 

 Radicle superior. 



Class II.— Gymnogens or Gymnospermous Plants. 



Stems increasing by concentric layers, and with a structure as in theExo- 

 gens. Embryo, with two opposite, or several whorled cotyledons. Ovules 

 naked, or not enclosed in an ovary, the carpel being absent or replaced by a 

 flat scale. 



