The Orders of the first thirteen Classes are founded on the number of Styles in each flower;

MONOGYNIA, 1 Style; DIGYNIA, 2; TRIGYNIA, 3; TETRAGYNIA, 4 PENTAGYNIA, 5; HEXAGYNIA, 6; HEPTAGYNIA, 7; OCTAGYNIA, 8; DECAGYNIA, 10; POLYGYNIA, many Styles.

The Orders of the 14th Class are two;

1. GYMNOSPERMIA, Seeds 4, apparently naked.
2. ANGIOSPERMIA, Seeds in a distinct seed-vessel.

The Orders of the 15th Class are two;

1. SILICULOSA, Seeds in a short Pod, or Pouch.

2. SILIQUOSA, Seeds in a long Pod.

In the 16th, 17th, and 18th Classes, the Orders are founded on the number of Stamens in each set.

TRIANDRIA, 3; PENTANDRIA, 5; DECANDRIA, 10; &c., in each set. The Orders of the 19th Class are three, and are founded on the structure of the flower, which is compound;

1. ÆQUALIS,

2. SUPERFLUA,

3. FRUSTRANEA,

All the florets perfect.

;

S Florets of the disk perfect; of the ray, with Pistil only.

Florets of the disk perfect; of the ray, with neither Stamen nor Pistil.

The Orders of the 20th Class are founded on the number of the

Stamens ;

MONANDRIA, 1; DIANDRIA, 2 ; &c.

The Orders of the 21st and 22d Classes are founded on the number, union, and situation of the Stamens ;

MONANDRIA, DIANDRIA, &c. MONADELPHIA, &c.

The Orders of the 23d Class are three, and are:

MONOECIA, united flowers accompanied with barren, or fertile ones, or both, all on one plant; DIOECIA, the same, on two different plants ; TRIOECIA, the same, on three different plants.

The Orders of the 24th Class are Natural Orders or Families.

ADDITIONS AND CORRECTIONS.

Page 41, between Poa distans, and P. procumbens, insert,

P. Borreri; panicle spreading, in fruit ascending and patent, spikelets linear of about 4 flowers, florets free, outer glume of the corolla obsoletely 5-nerved with a minute point. Glyceria Borreri, Bab. in E. Bot. Suppl. t. 2797.

Brackish places in the south and south-east of England, often in company with P. procumbens and distans. Mr Borrer, Mr Babington. Fl.-?-"May be distinguished from P. distans by its ascending branches when in fruit, the spikes seldom more than 4-flowered, the exterior glume of the corolla pointed, and its dorsal nerve extending to the apex ;-from P. procumbens by its patent branches, its spikelets not more than half the size, its exterior pointed glume of the corolla and the erect stalk ;-from P. maritima by the patent branches, its spikes about half the size, and the flat leaves." Bab.

p. 67. 1. 7.-After 6. spikes cylindrical, insert, S. media.

p. 76. For JASINE, read JASione.

p. 192. For Agrimonia Eupatoria, read Agrimonia Eupatorium. p. 199. After the specific character of Rosa Wilsoni, add, Borr. in Br. Flora, ed. 3, p. 231.

p. 255. For Brassica Napa, read Brassica Rapa.

p. 273. Oxytropis Rralensis, read Oxytropis Uralensis.

BRITISH FLORA.

CLASS I. MONANDRIA.' 1 Stamen.

ORD. I. MONOGYNIA.2 1 Style.

1. SALICÓRNIA. Perianth single, turbinate, fleshy, obscurely lobed. Style short. Stigmas bi-trifid. Fruit, an one-seeded Utricle, included in the enlarged Perianth.-Nat. Ord. CHENOPODEÆ, Vent.-Named from sal, salt, and cornu, a horn, from the hornlike branches and saline nature of the plants.

2. HIPPÚRIS. Perianth single, superior, forming a very indistinct rim to the germen. Fruit, a small one-seeded Nut.Nat. Ord. HALORAGEE, Br.-Named from iTTOs, a horse, and ouga, a tail.

(See Valeriana rubra 3 in CL. III.; Alchemilla arv. in CL. IV.; Zostera, in CL. XXI.; Chara, in CL. XXIV.)

(Ord. 2. DIGYNIA. 2 Styles. See Callitriche in CL. XXI.)

1. S. herbácea, L. (jointed Glasswort): stem herbaceous, articulations compressed somewhat thickened upwards and notched, spikes cylindrical slightly tapering at the extremity.-a. stem erect. S. herbacea, E. Fl. v. i. p. 2.-S. annua, E. Bot. t. 415. -B. stem procumbent. S. procumbens, E. Bot. t. 2475.

Salt-marshes, plentiful. Fl. Aug. Sept. O.-Plant leafless, much branched and jointed; articulations a little thickened upwards, very succulent, shrinking much when dry, in which state the upper extremity of each articulation forms a two-lobed membranous socket or short sheath, which receives the base of the articulation above it. Spikes of flowers dense, lateral and terminal, jointed like the stem, and bearing, at the base of every short articulation, on two opposite sides, a cluster of 3 flowers, each composed of a single perianth, apparently quite closed at the top, and pierced, as it were, by the bi- or trifid stigma and the single or two stamens: when two, appearing in succession. Mr

' From povos, one, and • From evos, one, and sential part of the pistil. stigmas are counted.

avne,
γυνή,

in this sense applicable to the stamen, one stamen. here made applicable to the pistil, or style, an esWhen the style is so short as not to be visible, the

The anomalous genera and species (that is, such species as vary in the usual number of stamens or styles, or such genera as have been placed in the Class and Order in question by other authors), are here given in italics and in parentheses, and thus referred to their proper places.

Wilson observes that the central flower (of the erect var. at least) has two stamens, one placed below, the other above, the laterally-compressed germen; and that the side-flowers have only one, placed above the germen.

2. S. radicans, Sm. (creeping Glasswort); stem woody procumbent and rooting, articulations compressed spreading and notched at the top, spikes oblong obtuse. E. Bot. t. 1691, & t. 2467, (S. fruticosa).

Muddy sea-shores, rare; on the Norfolk and Sussex coasts. In the Isle of Sheppey, Kent. Near Newry, Ireland. Fl. Aug. Sept. 2. -This scarcely differs from the preceding, except in its more branching, straggling and perennial stem, quite woody below, often growing at the edge of a low muddy bank, and depending from it. The true S. fruticosa is a very different plant, and confined to the south of Europe and north of Africa.-The various species of this genus, as well as others belonging to the same natural family, and growing abundantly on the coasts in the south of Europe and north of Africa, yield a vast quantity of soda, so much employed in making both soap and glass; whence their English name, Glasswort.

2. HIPPÚRIS. Linn. Mare's Tail.

1. H. vulgaris, L. (common Mare's-Tail); leaves linear 6-8 or 10 in a whorl. E. Bot. t. 763.

Ditches and, usually, stagnant waters; less frequent in Scotland. Fl. June, July. 4.-Stem erect, simple, jointed. Whorls of about 8 leaves, which are callous at the point. Flowers at the base of each of the upper leaves, not unfrequently destitute of stamen. Germen oval, inferior; within its minute rim or border, at the summit, which constitutes the calyx, is situated the stamen, with its large two-lobed anther; when young, having the style passing between the two lobes. Seed fixed to the top of the cell of the pericarp, and thus inverted. In deep streams of water this plant attains to 2 or 3 feet, with the leaves excessively crowded, 3 and even 4 inches in length, pellucid, with an opaque nerve, their points not callous; the whole plant submerged and barren.

CLASS II. DIANDRIA. 2 Stamens.
ORD. I. MONOGYNIA. 1 Style.

• Perianth double, inferior, monopetalous, regular.

1. LIGÚSTRUM. Cor. 4-cleft. Berry 2-celled, with the cells. 2-seeded. Nat. Ord. JASMINEE, Juss.-Named from ligo, to bind; on account of the use sometimes made of its long and pliant branches.

**Perianth double, inferior, monopetalous, irregular. Seeds enclosed in a pericarp which forms one piece.

2. VERÓNICA. Cor. 4-cleft, rotate, lower segment narrower. Caps. 2-celled.-Nat. Ord. SCROPHULARINEE, Juss.-Name of doubtful origin.