30 ANALYTICAL KEY. 



Stipules not sheatliing. 

 Herbs with uatery juice. Page 



Ovary 5-celled Seetzenia, ]86 



Ovary 1-celled. 

 Style or stigma 1 ; flowers with bracts or ; leaves simple . Urticaceje, 728 

 Styles or stigmas 2-3. 



Embryo peripheral ; leaves undivided Paronychieje, 158 



Embryo falcate-folded ; leaves palmate Cannabis, 731 



Desert shrubs ; cells of oo-celled berry 1-seeded . . , . ' . Maerua, 110 



Shrubs ; fruit drupe-like Ehamnus, 201 



Trees ; fruit drupe-like Celtis, 729 



Trees ; fruit samaroid , Ulmus, 728 



. Stipules 0. 



Aquatics J leaves finely dissected, whorled ; cotyledons 4. . Ceratophylle^, 745 

 Fleshy, prostrate herbs ; bracteoles 2, scanous , . , . . Trianthema, 327 

 Weedy herbs or shrubs, with 2-3 bracts under flowers. . . Amarantace^e, 673 



Herbs, shrubs or trees without scaly bracts. 

 Juice watery. 



Fruit a utricle Chenopodiaceje, 676 



Fruit a 5-10-celled berry PHYTOLAccACEiE, 694 



Fruit a 1-celled, indehiscent berry Daphne, 708 



Fruit a3-2-celled capsule Euphorbiaceje, 715 



Fruit a double samara ; styles 2 Acer, 204 



Fruit a simple samara ; style 1 Fraxinus, 519 



Fruit a dry drupe ; leaves pinnate Pistacia, 206 



Fruit a drupe; leaves entire Laurus, 708 



Fruit a dry nutlet Thymelaea, Lygia, 709 



Juice milky ; flowers raoncecious in a common involucre . , Euphorbia, 716 



C. Flowers monacioiis ; one or both kinds in aments or heads. 



Fertile flowers in an ament ; staminate racemed Humulus, 730 



Fertile flowers solitary or clustered ; staminate in aments. 

 Leaves pinnate ; fertile flowers and fruit naked .... Juglandace^, 734 

 Leaves simple ; fertile flowers 1-3 in a cluster, each in a cupule . . duercus, 737 

 Fertile flowers in an urn-shaped involucre ; staminate in globular aments . Fagus, 741 

 Fertile and staminate flowers in aments or heads. 

 Ovary and follicle 1-celled, 00 -seeded; seeds tasseled .... SALiciNEa2, 741 

 Ovary 1-2-celIed ; cells 1-seeded. 



Parasitic on trees Loeanthace.?:, 711 



Non-parasitic shrubs or trees. 

 Calyx regular, conspicuous in fertile flowers, fleshy in fruit . . Morus, 729 



Calyx 0, or rudimentary and scaly. 

 Style 1, stigma 1; flowers in globular heads .... Platanace^:, 734 

 Styles or long stigmas 2. 



Fertile flowers 2-3 above bract; nucules naked . . . Betulace.*:, 735 



Fertile flowers 1-2 above bract, each with an involucre. . Cupulifer^, 736 



Subclass IL GYMNOSPERMiE. POLYCOTYLEDONS. Pistil an open bract or altered 



leaf, bearing two ovules on its edge or upper surface ; flowers monoecious or dioecious. 



Shrubs, usually climbing; leaves brittle ; fruit drupe-like. . . . GNETACE.a:, 746 



Shrubs or trees : leaves awl-shaped or needle-shaped .... Conifers, 746 



Class IL ENDOGEN^. MONOCOTYLEDONS. The stem composed of bundles of 



fibres and vessels not arranged in layers, in Grasses often hollow. Veins of leaves usually 



parallel, rarely netted. Floral envelopes usually in 3's or 6's. 



'Division I, PETALS. Flowers with perigonium. 

 1. Ovary inferior. 

 Flowers dioecious or polygamous, regular. 



Aquatics, ovules and seeds numerous Hydrocharitaceje,'752 



Terrestrial climbers-; ovules 1-3 in cells ; leaves vein-netted. . Dioscoreace^, 777 



Flowers perfect, ovules and seeds generally numerous. 

 Stamens bearing anthers usually 1-2, gynandrous, bilabiate . . Orchide^, 753 



Stamens 3 ; anthers extrorse ; roots bulbous, cormouSj or fibrous , . lRiDEiE,7G6 



