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. XLIX. . XLVIII. Ericeæ. y. Corolk-lobes imbricate or valvate. 1. Leaves opposite. Slamens 2. Ovules n um e r o u s ................................................................. LIX. Scrop/mUrinex. Stamens 2. Ovules f e w ......................................................................... l , QUaax. Stamens 4 . Ovules n u m e r o u s ................................................................LIII 2. Leaves alternate. Anthers 1 - c e l l e d ............................................................ Anthers 2-ceHed, opening by p o r e s ........................... Anthers 2-celled, opening by slits. Herbs. Capsule bursting horizontaUy ................................. LXIII. Flantagbieoe. Slrnibs. Leaves with translucent d o t s ........................................LAHL Stamens opposite c o r o lla - lo b e s .......................................................... LXI. Ovary l-celled, 1 - o v u l e d ......................................................................LXII. Flmibaginex. C. Ovary superior. Flowers irregular. Anthers opening by p o r e s ............................................................................................ ........ Polygaleæ. Ovaiy deeply 4-lobed. Stamens 4 lV I . Ubiaiæ. Ovaiy simple or 2-lobed, 2-ce!led. Stigma not in a cup . . . . L IX. ScropJmîarineoe. Ovaiyj 1-celled. with central p l a c e n t a .................................................................... LX. Leniibularîeæ. Stigma in a c u p ............................................................................................................. XLIV. Goodeniaceæ (VelleiaJ. II I . A chlamtdeous (no apparent perianth). § Trees or shrubs. Male flowers in catkins. Branches jointed, leafless, with toothed sheaths LXXV. Casuarineæ. Branches with l e a v e s ..................................................................................................LXXVI. Coniferæ. § § Herbs. Male flowers solitary or p a n i c l e d ..............................................................XXIX. lA'^. Monochlamydeous. § Ovary inferior (flowers usually unisexual). Twining, parasitic, leafless h e rb s.................................................................. Climbing or prostrate leafy herbs, without t e n d r i l s ......................... Climbing or prostrate leafy herbs, with tendrils. Ovaiy hispid . Trees, with hermaphrodite f l o w e r s ........................................................... Trees or shrubs, with unisexual flowers. Stamens 8 -1 2 Herbs, trees, or shrubs, with stamens 4 -5 , opposite the perianth-lobes Herbs, with 2 -4 stamens, alternate with perianth-lobes . . . . § § Ovary superior. a. Leaves stipulate. Stipules oehreate. Flowers usually h e rm a p h r o d ite .......................... Stipulesfree. Stamensl-5,oppositelobesof perianth. Flowers unisexual Stipules free. Stamens 4 - 5 . Flowers hermaphrodite . . . . Stipules free. Stamens n u m e r o u s ........................................................... Stipulesfree. Stamens 8 . Styles 3 ..................................................... 8. Leaves reduced to sheaths o f the jointed branches y. Leaves exstipulate. LXVIII. . XXXV. Ficoideæ. XXXII. Cucurbitaceæ. . XXXI. Myrtaceæ (Eucalyptus). LXXIV. Cupuliferæ. . LXXI. Santalaceæ. . XXrX. Halorageæ. . LXIV. . LXXIII. Urticeæ. . XXIV. Rhamneæ (Cryptandra). . XXAT. Leguminosæ (Acacia). LXXII. . LXXV. t Flowers hermaphrodite. Carpels many, f r e e I. Ranunculaceoe. § Carpels solitary, 1-celled, with a simple style. Anthers 12 (3 sterile), opening by valves. Twining parasite . LXVIII. Laurineæ. KEY TO THE NATURAL ORDERS. . Anthers 4 , 2-celled, opposite lobes of perianth. Shnibs and trees. Seeds e x a lb u m in o u s ................................................................................. LXIX. P n k a ç e x . Anthers 1 ^ , 2-ceIIed. Seeds a lh u m in o u s ............................................LXX. TliymiUx. Anthei-s 3, united (ami I sterüe f i l a m e n t ) ..........................................LXIX. Proteacex (CoimpermiixJ. Anthers 2 -5 , free, 1 - e eU e d ...........................................................................LXVI. Amaranlacex. Stamens very numerous. Anthers f r e e ................................................XXVI. Leguminosa. §§ Caiqjcls combined, 1-celled, with 2 or more styles. Ovule 1 or several, basal. Leaves opposite, connate . . . . XII. Caryophylleæ. Ovule 1, basal. Seed 1 . Leaves usually alternate . . . I X V l l . Chenopodiaceæ. Ovules several. Seeds s e v e r a l ........................................................ V. Cruciferæ (Lepidium). t t Flowers unisexual. Tree. Leaves opposite. Ovaries oe . Anthers opening by valves III. Monimiaceæ. Trees or shrubs. Leaves alternate. Fruit w i n g e d ........................XIX. Sapindaceæ. Herbs, with 1 -5 stamens opposite lobes o f perianth . . . . LXXIII. U r itW . Shrubs or trees. Leaves opposite. Stamens 2. Fruit drupaceous L. Oleaceæ. Herbs,withalternateleaves,2-celledanthers,l-ceUedovary,and2 stylesLXATI. Chenopodiaceæ. Herbs, with 1-ceUed anthers, 1-ceUed ovary, and 1 style . . . LXVI. Amaranlaceæ(Alkrnuuthera). Herbs, witli 2-celled anthers, 2-ceUed ovaiy, and 2 styles . . . LXAL Phytoiaceeæ. Shrubs, with 2-celled anthers, 3-eelIed ovary, and discoid stigma LXXII. Enphorbiaceæ (Beyeria). MONO COTYLED ONS. I. Petaloid. Ferianth distinct, generaUy membranous. A. Perianth superior, a, Terrestrial plants. Flowers hermaphrodite. Perianth ii-regular, o f 6 unequal p i e c e s ....................................... Perianth regidar. Anthers 1 -4 , extrorse, opposite the sepals Perianth regular. Autliers 3, introrse, opposite the petals . Perianth reg-ular. Anthers 6, e x tr o r se ......................................... Perianth régulai-. Anthers 6, in t r o r s e ......................................... 8- Aquatic plants. Flowers u n i s e x u a l .............................................. B. Perianth inferior. a. Perianth o f large pieces. I. Orchideæ. II. Irideæ. III. Hæmodoraceæ. IX. Melanthaceæ (Campynema). I \'. Hypoxideæ. Y , Hydrocharideæ. Stamens 6 . Anthers e x t r o r s e ..................................................... Anthers introrse. Seed rounded, with a thin t e s t a ............................. X Anthers introrse. Seed often flattened, \rith a coriaceous, brittle, IX. Melanthaceæ. t e s t a XI. Liliaceæ. Stamens 3 x i lL Xyrideæ. 8- Perianth of 6 small, green, or dry chaff-like pieces. Anthers extrorse. Ovules s o l i t a r y VIII. AUsmaceæ. Antliers introrse. Ovules s e v e r a l x i I . Jtinceæ. II. Apetaloicl. Perianth very obscure or 0. Small iloating green s c a l e s .................................................................................................. \T . Erect marsh plant, with long, soft, thick catkin....................................................................VII. Caulescent w a te r -p lan ts VIII. AUsmaceæ.