2. Nymphaeaceous Plants. Nymphaeaceae

(10) Nymphaea - sepals four, greenish outside; petals numerous, white.

(11) Nuphar - sepals 5-6, yellow; petals several, much smaller, yellow.

3. Papaveraceous Plants. Papaveraceae

* Fruit oblong or globular; stigmas radiate.

(12) Papaver - petals four; stigmas four to twenty, sessile, connected, i.e. radiating on a flat sessile disk.

(13) Meconopsis - petals four; stigmas 5-6, free, supported by a short distinct style.

** Fruit linear; stigmas tivo-lobed.

(14) Chelidonium - petals four, small; stigmas two; capsule twovalved, one-celled, the placentas distinct; seeds crested.

(15) Glaucium - petals four, large; stigmas two, sessile; capsule two-valved, two-celled, the placentas connected by a spongy dissepiment; seeds not crested.

4. Cistaceous Plants. Cistaceae:

(1G) Helianthemum - two outer sepals smaller; petals deciduous capsule three-valved.

5. Resedaceous Plants. Resedaceae

(17) Reseda - flowers in racemss; stamens indefinite, but not numerous, about 8-24, inserted on a glandular disk.

6. Cruciferous Plants. Cruciferae

* Fruit a silique or pod, linear or linear-lanceolate, usually much longer than broad.

† Pods tivo-valved, with a dissepiment.

‡Style not forming a stout conical beak.

§ Calyx conspicuously bisaccate at the base.

(18) Matthiola - pod round or compressed; stigma sessile, twolobed, the lobes erect, gibbous or horned at the back. (10) Hesperis - pod quadrangular or sub-compressed, the valves keeled, somewhat three-nerved; stigma nearly sessile, of two closely-converging erect elliptical obtuse lobes.

§§ Calyx equal at the base, or very slightly gibbous.

(20) Erysimum - pod tetragonal, the valves prominently keeled, with one longitudinal nerve; stigma obtuse, entire or slightly emarginate; seeds in a single row; calyx erect.

(21) Sisymbrium - pod terete, or angled; valves convex, with three longitudinal nerves; stigma entire; seeds in a single row, smooth; calyx spreading.

(22) Nasturtium - pod nearly cylindrical, short, the valves convex, almost nerveless; stigma capitate; seeds irregularly in two rows.

(23) Barbarea - pod tetragonal, somewhat compressed, the valves convex, with a prominent longitudinal nerve; stigma capitate; seeds in a single row.

(24) Turritis - pod compressed, the valves slightly convex, with a prominent longitudinal nerve; stigma capitate; seeds in two rows.

(25) Arabis - pod compressed, the valves nearly flat, with a prominent longitudinal nerve, or rarely nerveless with numerous longitudinal veins; stigma obtuse; seeds in a single row.

(26) Cardamine - pod compressed, the valves flat, nerveless; stigma capitate; seeds in a single row.

‡‡ Style forming a stout, conical, often seed-hearing beak.

(27) Brassica - calyx erect; pod terete or angular; seeds globose, in a single row.

(28) Sinapis - calyx spreading; pod terete or angular; seeds globose, in a single row.

(29) Diplotaxis - calyx spreading; pod compressed; seeds oval or oblong, in two rows; beak less distinct than in Brassica and Sinapis.

† † Pods without valves or dissepiments.

(30) Raphanus - pods linear or oblong, tapering upwards, divided transversely into several one-seeded joints, forming cells, the lowermost barren.

** Fruit a silicule or pouch, scarcely more than one-half longer than broad.

† Pouch without valves, or one-celled, one-seeded.

(31) Cakile - pouch two-jointed, the joints placed end to end, the upper one angular, deciduous, one-seeded, the lower sometimes sterile.

(32) Crambe - pouch two-jointed, the joints placed end to end, the upper globose, one-seeded, the lower barren, stalk-like.

(33) Senebiera - pouch somewhat kidney-shaped, almost twolobed, of two cells placed side by side, not bursting; cells one-seeded.

(34) Isatis - pouch laterally compressed, one-celled, one-seeded, the valves keeled, scarcely separating.

†† Poach tivo-valved, with a dissepiment.

‡ Pouch laterally compressed, the dissepiment in the narrow diameter, the valves heeled or winged.

(35) Iberis - pouch ovate or roundish, notched, the valves boatshaped, winged at the back; seeds one in each cell; petals unequal, two outer ones much larger. (36) Lepidium - pouch roundish or oblong, entire or notched, the valves compressed, keeled or winged at the back; seeds one in each cell; petals equal.

(37) Capsella - pouch triangular-obcordate, the valves compressed, keeled but not winged; seeds numerous.

‡‡ Pouch dor sally compressed, or globose, the dissepiment oval, in the broadest diameter.

(38) Cochlearia - pouch globose, the valves very convex, onenerved; style permanent; seeds many.

(39) Armoraeia - pouch elliptical or globose, the valves very convex, nerveless; style permanent; seeds many.

(40) Camelina - pouch subovate, the valves ventricose, with a linear prolongation at the end, which is confluent with the persistent style; seeds many.