XViii ARTIFICIAL KEY TO THE NATURAL ORDERS. 



Ovary compound, 1 - 5-celled, when 1-celIed the 2 - several placentae parietal. 

 Sepals persistent, 4 - 7 in number. 

 Leaves punctate with transparent or dark dots, all opposite. HYPERICACEJE, 48 



Leaves not punctate, all or some of them alternate. 

 Ovary and pod not lobed, 1-celled or partly so : ovules orthotropous. CISTACHai, 45 

 Ovary and pod 3 - 7-horned or lobed, 1-ceUed, opening early. RESEDAOEiE, 41 



Ovary and pod 5-celled, Style umbrella-shaped. SARRACENIAOE^, 23 



Sepals caducous, only 2 or 3- Juice milky or colored. PAP AVERAGES, 24 



Sepals deciduous, 5 in number, valvate in the bad. TILIACE,^, 69 



* * Stame-ns united with the hose of the {hypogynous) petals. 



Calyx valvate in the bud. Stamens mouEidelphous : anthers 1-celled. MALTACE^, 65 



Calyx imbricated in the bud. Anthers 2-ceUed. Trees or shrubs, CAMELLIACEai,, 70 



* * * Stamens arid petals inserted on the calyx {perigynous). 



Leaves alternate, with stipules. . Pistils 1 - few-seeded. ROSACEA, 110 



Leaves opposite, no stipules. Calyx-tube enclosing the ovaries. CALYOANXIIACEX, 126 



2. Calyx more or less coherent with the surface of the ovary ; i. e. ovary inferior or partly so. 

 Leaves with stipules, alternate. Pomese in ROSACEA, 110 



Leaves without stipules. (In Cactaceae there are no proper leaves.) 

 Ovary 1-celled, with parietal placentse. 

 Eleshy and leafless plants : sepals and petals many, and much alike. OAGTACE^, 136 

 Rough-leaved plants : calyx-lobes 5 : petals 5 or 10. LOASACEai, 135 



Ovary 1 - 6-celled more than half free from the calyx, with a many-seeded placenta in the 



axis : pod circumciasile, the upper part falling off as a lid. PORTULACACE^, 63 

 Ovary 2-celled, half free : styles 2 ; pod 2-beaked, 2-seeded. HAMAMELACEiE, 147 



Ovary 8 - 4-ceUed (style 1) with 1-4 ovules in the axis of each cell. STYRACAGE^, 265 



Ovary 3- 5-celled (styles separate at the top) : ovules and seeds very numerous on pla- 

 centse projecting from the axis. Philadelphus in SAXURAGAGKS3, 141 

 Ovary and berry-like pod 10 - 30-celIed, many -seeded on the partitions. NYMPHiEAGE^, 22 



B. Stamens of the same number as the petals^ and opposite them. 



Pistils 3-6, separate. Flowers dioecious. Woody vinw. MENISPERMACBJE, 18 



Pistil only one : ovary 1-celled. 

 Style or stigma 1, simple : anthers opening by uplifted valves. BERBERIBAGEiB, 19 



Stylo and stigma 1 : anthers opening lengthwise. PRIMULAGEffi, 270 



Styles 5. Calyx funnel-form, dry. Ovule and seed solitary. PLUMBAGINACEiE, 270 



Style 3-clcft at the apex. Calyx 2-leaved. Seeds few. PORTULACAGEiE, 63 



Pistil only one : ovary 2 - 4-celled. 

 Calyx very short, 4 - 5-toothed, or the limb obsolete. Petals valvate. VITAGEffi, 77 



Calyx 4 - 5-clef t, Talvate in the bud Petals involute. RHABIN AGE^, 78 



C. Stamens when of the same number as the petals alternate with i^em^ sometimes twice as 

 many, sometimes fewer. 

 1. Calyx free from the ovary. 

 » Lea/ves punctate vnth transparent {or sometimes blackish) dots. 

 Flowers perfect. Leaves entire and simple, opposite. HYPERICACESl, 48 



riowers dioecious or polygamous. Leaves compound or divided. RUTACEiE, 74 



* * Leaves not punctate with transparent dots. 

 ■i- Pistils one or more, simple^ i. e. of one carpel. 

 Stamens inserted on the receptacle (hypogynous). Stipules none. 

 Flowers dioecious. Fruit a drupe. Woody climbers MENISPBRMACE.^ IB 



Flowers mostly perfect. Herbs, rarely somewhat shrubby plants. RANUNG DLAGE^, 2 

 Stamens inserted on the base or tube of the calyx (perigynous). 

 Flower mostly papilionaceous or otherwise irregular. Pistil only one. LEGUMINOS.^, 88 

 Flower regular. Pistils 1 - several. 



