Leaves of L. officinalis are opposite, sessile, oblong-linear, with curled edges, 2 - 6 cm long, green or gray-green from pubescence. On the paradermal section, the outlines of the epidermal cells on the adaxial side are rectilinear, the projection is polygonal, the abaxial is more sinuous and the projection is polygonal. The cells of the adaxial (upper) epidermis are larger than the cells of the abaxial (lower) one. In the cell membranes of the epidermis, nucleoli are clearly visible on both sides of the leaf. Adaxial and abaxial epidermis is a pubescent with trichomes (Figure 2).

Our studies have shown that the presence or absence of trichomes can serve as an informative sign. In L. officinalis, trichomes are simple single cell two-pointed; three-pointed; multi-end. Lavender leaf hairs accumulate essential oils under the cuticle of secreting cells, the cuticle is tightly attached to the membranes of the secretory cells due to the lack of excretory products (Figure 2 and Figure 3).

The leaves are amphistomatic, stomata are located on both sides of the leaf blade, located transversely to the longitudinal axis of the leaf. The shape of the stomata is round-oval. The upper (adaxial) epidermis has a significantly smaller number of stomata compared to the lower (abaxial) epidermis. All this leads to a reduction in water loss from the surface of the leaf. The closing stomata cells on both sides of the leaf are almost the same length. Stomata are submerged, polocytic and diacytic types (Figure 2 and Figure 3).

Leaf mesophyll on the cross section of the dorsiventral type, which is represented by palisade cells located under the upper epidermis of the leaf

mesophyll, spongy cells—above the lower epidermis of the leaf mesophyll. The epidermis is represented by one row of cells with a thick-walled cuticle layer. Adaxial epidermal cells are larger than abaxial (Figure 2).

Between the adaxial and abaxial epidermis there is an assimilation tissue consisting of palisade and spongy cells. Under the adaxial epidermis is the palisade parenchyma. The palisade parenchyma is chlorophyll-bearing, large and elongated, which consists of two rows of cells and is located between the adaxial epidermis and the spongy parenchyma of the leaf. Drops of essential oil were found in epidermal and palisade cells (Figure 3).

The spongy chlorophyll-bearing parenchyma consists of 3 - 4 rows and is located between the palisade parenchyma and the abaxial epidermis. The spongy parenchyma is round, large-cell with small cavities. Between palisade and spongy cells there are numerous lateral conducting bundles, with 3 - 4 small vessels (Figure 3).

The main leaf vein extends on the abaxial side. The rest of the vein is occupied by the main parenchyma, into which 1 conductive bundles is immersed,

parenchyma cells are thin-walled, round-oval, among which there are hydrocytic cells. Conductive bundles of open collateral type, numerous, consisting of phloem and xylem. Xylem is thick-walled, elongated. Their walls are thickened in the form of spirals (Figure 3).

The base of the stem on the cross section is rounded, beam type. The structures of the stems of woody plants are due to many years of active activity of the apical and lateral meristems. Therefore, the trunk and side branches of these plants are significantly thickened. They are powerful, highly lignified, with the early development of secondary integumentary tissue (Figure 4).

The anatomical structure of the stem is divided into three topographic zones: the periderm (cork), the secondary cortex, and the central cylinder. The integumentary tissue—the cork consists of several rows of radially located cells with thick cork-covered membranes. The integumentary tissue is represented by a cork. Its cells are dark brown in color, thick-walled, densely closed. Outwardly, upon division by tangential septa, the cells of the phellogen are formed by the cells of the tube, and inside—the cells of the phelloderm. The complex of the phellogen, phellem and phelloderm makes up the periderm. Under the periderm

is a round-oval secondary cortical parenchyma, which consists of 6 - 7 rows and remains throughout. Under the cortex parenchyma groups of bast fibers are formed. The phloem is extensive, located between the cortex parenchyma and libriform (Figure 4).

Wood occupies a continuous cylinder surrounding the core, which is located centrally in the stem. Primary conductive tissues are preserved in the stem, and then the secondary ones immediately form a continuous cylinder, which in the cross section looks like an almost continuous ring. With age, the emerging cambium changes the anatomical structure of the stem. It annually produces secondary xylem (wood). Aside xylem cambium work more vigorously, pushing the primary xylem to the core. The long and the rhythmic activity of the cambium cause a “layering” of wood. It clearly distinguishes boundary between the annual increment (the annual rings). This is due to differences in the composition and structure of histological elements formed from cambium at different times of the year (Figure 4).

By the number of tree rings, you can determine the age of the plant. The secondary xylem, which occupies most of the section, is easy to determine, since its cells are stained red-brown. It is represented by tracheid located in radial rows and sparse, elongated and short core rays. The core is not wide, it is represented by large and small round-oval, thin-walled parenchymal cells and they contain hydrocytic cells (Figure 4).

The root is the axial organ of the plant, which has radial symmetry, has unlimited long growth, has root hairs and a cap and does not form any other organs on itself. The main functions of the root are the absorption of water and minerals dissolved in it from the soil, the attachment of the plant organism to the substrate and the synthesis of organic substances (amino acids, nucleotides, hormones, enzymes and alkaloids).

In addition, it performs other functions: supply of nutrients, respiration, vegetative propagation, communication with soil microorganisms. The base of the root on the cross section is round, bundled, more lignified. In the anatomical structure of the roots of the studied species, three main zones can be distinguished: the periderm, secondary cortex, and central cylinder.

The primary crust with a secondary thickening of the root, as a rule, breaks and dies. The integumentary tissue is a cork; at large roots, the cork replaces the cork. Perennial root with a multilayer crust, including large numerous groups of bast fibers and periderm (Figure 5).

The periderm is three-layered, consists of a phellogen, a phellem and a phelloderm. Phellogen cells are rectangular flattened in the radial direction and passing from the outside to the phellem cells, inside—the cells of the phelloderm cell are clearly distinguished from the cells of the inner cortex by a larger size and rectangular flattened in the radial direction. Under the periderm is a round-oval secondary cortical parenchyma, which consists of 6 - 7 rows and remains throughout (Figure 5).

Under the cortex parenchyma groups of bast fibers are formed. The phloem is extensive, located between the cortex parenchyma and libriform. Wood occupies a continuous central root cylinder. Primary conductive tissues are preserved in the root, and then secondary ones immediately form a continuous cylinder, which in the cross section has the form of solid ring. Secondary xylem, occupying most of the slice. The vessels in the secondary xylem are larger, with thickened walls. It is represented by tracheid located in radial rows and radial rays. Radial rays are 1 - 3 rows, their cells are elongated, filled with tannins (Figure 5).

Thus, for the first time under the introduction of the Tashkent Botanical Garden (Uzbekistan), an anatomical and histological study of the autonomic organs of Lavandula officinalis was carried out. The results obtained made it possible to determine a number of morphological, anatomical, and histological and characteristic diagnostic characters for this species. Our studies have shown that the presence or absence of trichomes can serve as an informative sign. In L. officinalis, trichomes are simple, single-cell, double-ended; three-pointed; multi-end. Lavender leaf hairs that accumulate essential oils under the cuticle of secreting cells, the cuticle are tightly attached to the membranes of the secretory cells due to the absence of secretion products. When treated with a solution of methylene blue and safranin, drops of yellow-orange essential oil are found in the epidermal, palisade and bark parenchymal cells. Identified diagnostic features that can be used in taxonomy and can be used to identify plant materials can also be used to develop indicators of authenticity in this type of raw material.