Perennial to annual herbs, semi-shrubs or shrubs, extremely rare trees or vines, often with aromatic oil-bearing epidermis, stalked or sessile glands, and all kinds of simple hairs, jointed hairs, even stellate hairs and dendritic hairs, often with four-sided and grooved stems and opposite or whorled branches. Roots fibrous, thinly thickened into spindle-shaped, extremely thin with small tuberous roots. Occasionally, new branches form aerial walking stems or underground creeping stems with many degenerated leaves, which often have short fat internodes and five-color leaves. Leaves are simple, with all kinds of serrations, shallow to deep, compound leaves, opposite (often alternating), 3-8 whorls, and extremely rare parts alternate. Flowers are rarely solitary. Inflorescences are cymose, usually consisting of two small 3-to-many-flowered dichotomous cymes forming obvious wheel-shaped cymes (false wheels) at nodes; Or branched to become a pair of single cymes, which are only 3-1flower, and the latter forms the phenomenon of double flowers per node. Dense sessile inflorescences are formed due to the complete degeneration of the main shaft, or the main shaft and lateral branches are more or less developed, and the bracts are degenerated into bracts, while several to many corymbose inflorescences are aggregated into terminal or axillary racemes, spikes, cones and sparse-headed compound inflorescences, which are rarely ventral (open to one side) due to the gathering of flowers on the main shaft, and each bract leaf is extremely rare to support a flower, and a real raceme is formed due to the alternate flowers. The bract leaves often gradually transition to bracts on the stem, and there are often a pair of tiny bracts under each flower (only one is developed in a single inflorescence), and there are few bracts and bracts, or bracts and bracts tend to be developed and colored, with needles, leaves or special shapes. The phenomenon that the flowers are symmetrical on both sides, somewhat radiation-symmetrical, bisexual, or degenerated into hermaphroditic flowers, rare and heterozygous, extremely rare flowers are two types with closed flowers, rare flowers of different sizes or large, medium and small flowers. The flower pattern is S5P5A4G(2). Calyx is inferior, persistent (sparse two pieces are shield-shaped, at least one of which falls off), and often increases and thickens to varying degrees in fruit, even fleshy, bell-shaped, tubular or cup-shaped, sparse pot-shaped or spherical, until it bends and closes the calyx, 5-sparse and 4-base, which is open when budding, with equally or nearly equally separated teeth or lobes, and extremely thinly splits to near the bottom. If it is joined, it often forms various two lips. In the meantime, it is simple, crossed or repeated, and the branched secondary veins develop in a larger or smaller range, thus forming 8, 1 1, 13, 15 to 19 veins, and the lateral veins that penetrate into calyx teeth are sometimes marginal or netted, and the teeth are extremely rare. There are 10 teeth (sometimes 5 long and 5 short), the mouth of calyx is flat or inclined, the inner surface of throat is sometimes hairy, or a Garposte-gium is formed in the middle of calyx tube, and the calyx is sometimes covered with various hairs and glands. Corolla closed, usually colored, with different sizes, well-developed, usually protruding from the calyx (thinly hidden), tubular or spreading upward, straight or curved (extremely thin and twisted), sometimes with various hairs or hair rings (nectary gland cap Nectarostegium or Annulus) in the tube, the base is extremely sparse with sacs or spurs, and there are nectaries inside; Canopy 5-sparse 4-cleft, usually combined in different forms and degrees to form a two-lipped (2/3 type, or less 4/1type), sparse into a pseudo-lipped or single-lipped (0/5 type), sparse 5 (-4) lobes nearly equal, rolled and imbricated, usually open in bud, or double-covered. The lateral lobes are sometimes underdeveloped, forming Apo-physis or Pleuridia, and sometimes there are folds or thickened parts on the jaw, but in the 4/1formula, the lower lip is sometimes boat-shaped, saccular or various shapes. Stamens are inserted on the corolla, alternating with corolla lobes, usually four, two strong, and sometimes degenerated into two, with the fifth (back) staminode, separated or anther chambers close to 20% pairs, and rarely joined or sheathed at the base (for example, ColeusLour．.), usually the front pair is longer, and the back pair is longer after sparse (NepeteaeBenth．.), usually with different degrees. Rise and lean against the helmet-shaped upper lip of the corolla, or spread out and stretch straight forward, lean down, lie flat on the lower lip of the corolla or be wrapped in it (Oci—meaeKudo, Basil, P.P.), and the sparse pairs are not parallel to each other (then lean down or rise to the stamens later); Filaments are hairy or not, usually straight, thin in bud, sometimes long, thin out after flowering, and sometimes there are various appendages at the base of filaments; Connective extension or no; Anthers are usually oblong, ovoid to linear, sparse spherical, 2-loculed, inward, and sometimes parallel, but they are usually forked, flattened or even spread out in different degrees, each locule is longitudinally split, and it is 1 locule after anthesis, sometimes it degenerates to 1 locule before or after anthesis, and sometimes it is flat (then anther is spherical) and sparse. The lower disk is usually fleshy, conspicuous, and the whole disk is usually 2-4-lobed, until it has lobes opposite or alternate to the ovary lobes. The anterior (or occasionally posterior) lobes are sometimes finger-shaped and sparse, but there is a protrusion in the center of the receptacle (Baoting Flower is Wencheng IAC. Y.WUETS. CHOW). The pistil is formed by 2 centripetal carpels, which split into 4 ovule-bearing lobes in the early stage due to contraction, and it is extremely thin and shallow or undivided. Part, baotinghuasubfamily wenchengioideaec.y.wuets.chow); Ovary superior, sessile, sparsely stipitate (ScutellariaLinn．)；; Ovules are simple, inverted, erect, basal, inserted on the placentation of the central axis, with the nucellar ridge facing the axis and the micropyle downward, extremely sparsely lateral and somewhat inverted, erect, with the exception of somewhat curved; Styles are usually inserted at the base of ovary (gynobasic), and the sparse insertion point is higher than the base of ovary, and there are 2 thin and unequal lobes at the top, which are sparse and undivided, except for 4-lobed. The fruit usually splits into 4 small nuts with dry skin, which are thinly drupe-like (Echinaceae PrasioideaeBriq．.) with a somewhat hard endocarp and a fleshy or juicy exocarp, which is obovate or quadrangular, smooth, hairy or wrinkled, carved, with sparse edges or terminal or peripheral wings (sometimes the dorsal abdomen is flattened, and the dorsal abdomen is sparsely differentiated), with small basal fruit umbilicus, which is sparse due to the connection of lateral ventral surfaces. Extremely thin and close to the back (with a basal-dorsal commissure, such as LavandulaLinn．.), a small part of the sparse receptacle is separated from the nutlet to form an elaiosome (such as AjugaLinn, LamiumLinn． Linn. and Rosmarinus Linn.); Seeds per nut are solitary, erect, extremely sparse and wrinkled, with a thin seed coat that is often completely absorbed later, basal and sparsely lateral. Endosperm is absent or extremely undeveloped if it exists at fruit. Embryo has flat, sparse convex or folded cotyledons, slightly fleshy, parallel to fruit axis or transverse; Young roots are short, and they are located on a cotyledon (i.e. cotyledon with back, such as ScutellariaLinn．.) except for bending. The undergraduate course is a large branch with worldwide distribution. There are 10 subfamily, about 220 genera and more than 3,500 species in the world, of which one-third are monotypic genera and one-third are few species. There are more than 800 species belonging to 99 genera in China. Most of the general families are from Asia, Africa and Europe, and the only widely distributed genera are TeucriumLinn．, Scutellaria Scutellaria, PrunellaLinn, StachysLinn, SalviaLinn, MicromeriaBenth．, Ocimurium Linn, etc. There are more than 100 species in Salvia, Alpinia HyptisJacq, Scutellaria, NepetaLinn, Stachys, ThymusLinn, Hedyotis zingiberensis, Plectranthus L 'her. Sensitissimo, PhlomisLinn．, and Fragrant Family/kloc-. Most of the above Daqu and widely distributed genera take the Mediterranean Sea and Near East and Central Asia as their modern distribution centers. The distribution centers of endemic genera and monotypic genera in the world are Mediterranean, Near East-Central Asia, China-Japan, India-Malaysia, tropical Africa, southern Africa, Australia, temperate North America, California-Mexico, South America, etc. 10. Most of them often have seasonal dry climate, especially in the so-called "Mediterranean climate" area, undergraduate plants often occupy a special position in the plant community. However, there are many primitive genera and species (related to Verbenaceae and Lithocarpaceae) in the humid tropical and subtropical mountainous areas, especially in the southwest and south of China. It seems that the undergraduate course may have originated from these areas and later developed in the seasonal drought environment. At present, undergraduate plants are rare in the Arctic alpine region, and only widely distributed in humid habitats. Undergraduate plants are famous for being rich in a variety of aromatic oils, many of which can be used for medicine. As aromatic oil plants, mint, thyme, lavender, basil, rosemary, Sylvia and so on are valued to some extent. As medicinal plants, there are Scutellaria baicalensis Georgi, Schizonepeta tenuifolia, Pogostemon Pogostemonis, Salvia miltiorrhiza, mint, perilla frutescens, Elsholtzia bodinieri, Prunella vulgaris, motherwort and so on. Perilla frutescens is one of the famous oil crops. Because of the special shapes of flowers and leaves, there are also a bunch of red flowers, colorful leaves and so on.