, p. 458.

A. Flowers having a distinct, usually coloured perianth. § Ovary inferior.

* Flowers gynandrous (anthers and stigmas consolidated).

Tuberous or fibrous-rooted terrestrial or epiphytal herbs with very irregular flowers .... Orchidaceae, p. 466

** Flowers not gynandrous (stamens free).

Leaves cordate, net-veined and ribbed. Flowers unisexual, inconspicuous. Climbing herb . . . Tamus, p. 533

Leaves usually broad, veins diverging from the midrib.

Anther one, 1-celled. Leaves 1-3 feet long Marantaceae, p. 467

Anthers five or more. Leaves very large . . Musaceae, p. 467 Leaves usually long and narrow, veins parallel with midrib. Stamens three.

Herbs with bulbous or rhizomatous roots, and for the greater part with ensiform leaves . . Iridaceae, p. 469 Stamens six. Leaves flat.

Fruit 3-celled. Outer perianth-segments petaloid. Herbs with bulbous or fibrous roots, with an umbellate or paniculate inflorescence or solitary . flower ..... Amaryllideae, p. 480

Fruit 3-celled. Outer perianth-segments sepaloid,

Bromeliaceae, p. 469 Stamens more than six. Aquatic herbs . Hydrocharidaceae, p. 463 §§ Ovary superior.

Outer perianth-segments sepaloid or glumaceous. Carpels consolidated.

Outer perianth-segments quite distinct from the inner. Placentas axile.

Herbs with net-veined verticillate leaves and white or violet flowers . . . . . Trillium, p. 531

Herbs with parallel-veined leaves and umbellate flowers

Commclynaccae, page 536 Placentas parietal.

Shrubs with linear net-veined leaves . . Philesia, p. 532 Perianth-segments similar.

Flowers scattered, inconspicuous. Leaves flat or fistular,

Juncaceae, p. 537 Flowers on a spadix. Leaves usually broad with reticulated veins........Aroideae, p. 461

Flowers usually umbellate. Leaves broad, net-veined and ribbed. Shrubs......Smilacineae, p. 532

Outer perianth-segments petaloid. Carpels more or less distinct.

Placentas spread over the dissepiments. An aquatic with long triquetrous leaves and umbellate flowers elevated upon a long stalk...... Butomus, p. 465

Placentas narrow. An aquatic with sagittate leaves and elongated inflorescence.....Sagittaria, p. 464

Carpels combined into a solid pistil.

Placentas parietal. A climbing shrub with 5-nerved ovate leaves and showy flowers . Lapageria, p. 532

Placentas axile.

Petals rolled inwards after flowering. Aquatic herbs with cordate or oblong leaves and small blue flowers

Pontederaceae, p. 535 Petals not rolled inwards after flowering.

Anthers turned outwards. Capsule usually dehiscing sep-ticidally. Crocus-like plants or with broad conspi-cuously-nerved leaves and paniculate flowers,

Melanthaceae, p. 533 Anthers turned inwards. Fruit when capsular dehiscing loculicidally. Herbs of very dissimilar habit and inflorescence, rarely shrubs . , , Liliaceae, p. 494

B. Flowers without a distinct perianth.

§ Flowers glumaceous.

Tufted herbs with linear leaves, with a split sheath and hollow terete flower-stems ..... Gramineae, p. 538

Tufted herbs with linear leaves, sheath not split, and usually angular solid flower-stems . . . . Cyperaceae, p. 537

§§ Flowers naked or with a few bristles or hairs, and arranged on a spadix. Fruit baccate. Spadix usually more or less enveloped in a spathe,

Aroidecae, p. 461 Fruit dry. Spadix naked, or spathe reduced to a bract Typhacccae, p. 464