Anthers with recurved valves. Evergreen or deciduous trees or shrubs.....Lauraceae, p. 392

Perianth tubular, coloured, hardened at the base. Herbs

Nyctaginaceae, p. 385

Perianth tubular, usually coloured, not hardened at the base. Stamens borne on the segments of the perianth.

Shrubs and trees . . . Proteaceae, page 395

Stamens not borne on the segments of the perianth. Ovules erect. Evergreen or deciduous shrubs or trees with lepidote leaves . Elaeagnaceae, p. 395

Ovules pendulous. Shrubs with a tough fibrous bark.....Thymelaceae, p. 393

Perianth short, not tubular or only slightly so.

Leaves lepidote. Shrubs . . . Elaeagnaceae, p. 395 Leaves not lepidote.

Perianth dry and coloured. Herbs Amaranthaceae, p. 388 Perianth herbaceous or succulent Chenopodiaceae, p. 388 Flowers unisexual. Herbs or shrubs with scaly simple leaves and a membranous or baccate 1-seeded fruit . Chenopodiaceae, p. 388 3. Flowers with both calyx and corolla, the latter monopetalous.1 § Ovary superior. Flowers regular. * Ovary 3- to 5-lobed. Leaves usually scabrid. Inflorescence gyrate. Herbs or undershrubs...... Borraginaceae, p. 319

Leaves not scabrid. Inflorescence straight. Corolla plaited in aestivation. Trailing annuals with showy flowers resembling those of Convolvulus.....Nolanaceae, p. 318

** Ovary not lobed.

Anthers opening by pores. Evergreen or deciduous shrubs with conspicuous flowers......Ericeae, p. 275

Anthers opening by slits. Carpels 4 or 5 or only 1.

Stamens equal in number and opposite to the petals. Herbs

Brimulacccae, p. 371 Stamens not opposite the petals if of the same number. Carpels distinct; seeds indefinite. Succulent herbs

Crassulaceae, p. 188 Carpels combined.

AEstivation of corolla plicate. Climbing, twining, or trailing herbs with brightly coloured flowers Convolvidaceae, p. 315 Estivation of corolla imbricated. Shrubs often with prickly evergreen leaves and small flowers llicineae, p. 99

Carpels usually three.

Inflorescence gyrate. Herb3 . . Hydrophyllaceae, p. 314

Inflorescence not gyrate. Herbs or shrubs Polemoniaceeae, p. 305

Carpels only two. Stamens two.

Corolla valvate. Erect shrubs or trees : . Ohaceae, p. 291 Corolla imbricate. More or less trailing or climbing shrubs with white or yellow flowers . . Jasmineae, p. 289 Stamens four or more.

Inflorescence gyrate. Herbs . . . Hydrophyllaceae, p. 314

1 In some instances the petals are only very slightly united at the base.

Inflorescence straight.

Calyx in a broken whorl. Trailing or climbing herbs,

Convolvulaceae, page 315

Calyx in a complete whorl.

Flowers symmetrical. Seed3 usually kidney-shaped and pitted. Herbs or shrubs . Solanaceae, p. 326

Anthers and stigmas consolidated. Seeds usually plumose. Herbs or shrubs . Asclepiadceae, p. 300

Anthers free from the stigma.

Corolla imbricated. Herbs with showy flowers and usually ribbed leaves . Gmtianaceae, p. 302 Corolla valvate or convolute. Herbs with flowers in one-sided spikes . . . Spigelia, p. 302

Corolla contorted, Seeds usually plumose. Shrubs or trailing herbs. Stigma constricted in the middle . . . . . Apoeyneae, p. 297

Flowers unsymmetrical. Leaves opposite, exstipulate.

Flowers spicate or capitate, tetramerous. Shrubs

Buddlea, p. 347 Carpel single. Styles 5. Herbs or undershrubs Plumbaginaceae, p. 380 §§ Ovary superior. Flowers irregular.

* Ovary 4-lobed; lobes 1-seeded. Herbs or shrubs with opposite leaves usually furnished with immersed glands of aromatic fragrant oil ........... Labiates, p. 360

** Ovary undivided. Carpels two.

Fruit nucamentaceous, 2- or 4-celled. Herbs or shrubs

Verbenaceae, p. 357 Fruit capsular or succulent. Placentas parietal.

Annual herbs. Seeds not winged. Fruit terminated by a curved beak . . . . Martynia, p. 354

Shrubs or herbs of trailing, twining, or climbing habit.

Fruit not beaked; seeds winged . Bignoniaceae, p. 351

Placentas axile,

Seeds albuminous. Herbs, shrubs, or trees with showy flowers ..... Scrophidarineae, p. 333

Seeds exalbuminous.

Seeds winged. Shrubs or herbs of climbing or trailing habit and showy flowers . . . Bignoniaceae, p. 351 Seeds wingless, attached to hardy woody placentas. Herbs with elegant bipinnatifid leaves and leafy spikes of dull-coloured flowers . Acanthus, p. 355

Placenta free, central. Stamens two. Aquatic or marsh herbs ....... Lentibularineae, p. 370

§§§ Ovary inferior.

* Carpels solitary.

Anthers syngenesious (united with the pistil). Herbs or shrubs; flowers (florets) collected in involucrate heads. Ovary usually surmounted by a scaly bristly or plumose calyx (pappus) ... ... Composite, p. 229

Anthers free.

Carpel quite solitary. Flowers in bracteate heads Dipsaceae, page 227 Carpel with two abortive ones. Flowers not in bracteate heads.......Valerianaceae, p. 226

** Carpels more than one.

Anthers syngenesious. Herbs with spicate or axillary irregular flowers.....Carrvpanulaceae (Lobelia), p. 272

Anthers free.

Anthers opening by pores. Shrubs . . Vaccinieae, p. 274

Anthers opening by slits.

Herbs with blue or white usually bell-shaped flowers

Campanalaceae, p. 268 Shrubs or trees with alternate exstipulate simple leaves and small flowers.....Ebenaceae, p. 288

Herbs with angular stems, whorled leaves, and cymose flowers ....... Stellatae, p. 225

Shrubs with opposite leaves and showy usually fragrant flowers......Caprifoliaceae, p. 218