NATURAL ORDERS. xv 



without perianth. Ovules and seeds in the females not enclosed in 

 any ovary or pericarp. 



Class II.— MONOCOTYLEDONS. 



In germination the plumule is developed from a sheath-like 

 cavity on one side of the embryo. The -vascular tissue of the 

 stem occurs in scattered bundles amongst the cellular. The 

 nerves of the leaves are more or less parallel (except in Aroidea, 

 Diofcoridea^ Paris, and in some Liliace(E). The parts of the 

 flower are usually in twos or threes. 



* Perianth none, or of i, small sepals or bracts. 



LXXV. TyphacE/E (figs 939-43). Flowers unisexual, inter- 

 mixed with bracts in dense heads or spikes. Fruit a dry nut. 



LXXVI. AroidEjE (figs. 944-5). Flowers unisexual, often 

 intermixed with bracts in dense heads or spikes, mostly in a 

 spatha. Fruits usually succulent. 



LXXVII. LemnacEjE (figs. 946-50). No distinct stem. 

 Flowers (very scarce) on the edge of the small leaf-like floating 

 fronds. 



LXXVIII. NatadE/B (figs. 951-71). Floating or submerged 

 plants. Flowers distinct or in loose spikes. Stamens i, 2, or 4. 

 Ovaries i, 2, or 4. 



** Perianth wholly or partially petal-like. Ovary apocarpous. 



LXXIX. AlismacE^ (figs. 972-7) ; the only British family of 

 the group. 



*** Perianth wholly or partially petal-like. Ovary inferior. 



LXXX. Hydrocharide^ (figs. 978-So). Floating or stib- 

 merged plants. Flowers usually unisexual. Perianth regular, with 

 a slender tube. 



LXXXI. OrCHIDACE^ (figs. 9S1-1016). Perianth very irregu- 

 lar. Anther 2-celled, combined vviih the style in an axile column. 



LXXXII. IriDE/E (1017-23). Like the Amaryllis family, but 

 stamens 3. Leaves often in two opposite rows. 



LXXXII I. AMARVLLIDE^ (figs. 1024-7). Terrestrial plants. 

 Perianth of 6 divisions. Stamens 6. 



LXXXIV. DIOSCORIDE^ (fig. 1028). Twining plants. Flowers 

 unisexual. Perianth regular, of 6 divisions. 



**** Perianth regular. Ovary syncarpous, superior. 



LXXXV. LiLiACE^ (figs. 1029-59). Perianth petal-like. 



