The dried fruit is small cylindrical in shape with slightly pointed ends, 5 to 8 mm long and about 2 mm wide. The base sometimes has a small fruit stalk, and the yellow-brown style base remains at the top. Appearance yellow-green. The spores are oblong in shape, with 5 raised ridges, a pentagonal cross section, the four sides on the back are approximately equal in length, and the joint surface is flat. There is 1 seed in the ramified fruit, which is slightly kidney-shaped in cross section. The aroma is aromatic and the taste is sweet and slightly pungent. The particles are uniform. full. The ones that are yellow-green, fragrant and sweet are better. The shape of dill seeds is very similar to this product. In some areas such as Gansu and Guangxi, dill seeds are used as fennel.

The "Compendium" also calls dill seeds alias fennel. It can be seen that dill seeds have been used as fennel for a long time, but the names and facts of the two should not be confused. The main differences between the medicinal materials are: dill seeds Small and round, the spores are broadly oval, flat, 3 to 4 mm long and 2 to 3 mm in diameter; the four sides on the back of the transverse section are unequal in length, and both sides extend into a wing shape. The smell is weak. Cross section of the schizocarp: The exocarp is a row of tangentially extending flat epidermal cells; it is covered with cuticle. The mesocarp is composed of serial thin-walled cells; there are 6 oil tubes, including 2 on the joint surface and 1 between every 2 fruit ribs on the back. The oil tubes are slightly oval or semicircular, with a tangential direction of about 250 μm, and there are many reddish-brown flat secretions around it. cells; the vascular bundle column is located at the fruit edge and is connected with two outer tough vascular bundles and fiber bundles. The xylem is a small number of small vessels. The phloem is located on both sides of the bundle column. There are many large lignified reticulate patterns inside and outside the vascular bundle pillar. cell. The endocarp is a row of flat cells of varying lengths. The seed coat is a row of flat and elongated cells, containing brown matter. There are several rows of cells in the center of the joint surface, and there are small spinal tube bundles. The inner endosperm cells are polygonal and contain many fine aleurone grains, including fine cluster crystals; and a small amount of fatty oil.

Powder: yellow-brown.

① The surface of the epidermal cells of the exocarp is polygonal or quasi-square in appearance, with slightly thicker walls. Stomatal infinitive, 4 accessory cells.

②The reticulated cells are rectangular or oblong with slightly thicker walls; they are slightly lignified and have oval or oblong reticular pits.

③The oil tube wall fragments are yellow-brown or dark red-brown, and the intact ones are as wide as 250 μm, with traces of polygonal secretory cells visible.

④The surface of the cells in the endocarp mosaic layer is long and narrow, with thin walls. A constant number of cells are in a group, and their long axes are embedded in irregular directions with each other. In addition, there are endosperm cells, calcium oxalate cluster crystals, wood parenchyma cells, etc. This product is best with plump seeds, yellow-green color and strong aroma. 1. Take 0.5g of this product powder, add an appropriate amount of hexyl ether, cold soak for 1 hour, and filter. Concentrate the filtrate to about 1 ml, add 2-3 drops of 7% hydroxylamine hydrochloride in methanol, and 3 drops of 20% potassium hydroxide in alcohol. Heat it slightly on a water bath. After cooling, add dilute hydrochloric acid to adjust Ph3-4, and then add 1% 2 drops of alcoholic solution of ferric chloride will appear purple. (Check coumarin)

2. Take 0.5G of this product powder, add an appropriate amount of hexyl ether, cold soak for 1 hour, and filter. Concentrate the filtrate to about 1 ml, add 2-3 drops of 0.4%-2,4-dinitrophenylhydrazine 2mol/L hydrochloric acid solution, and it will appear orange-red. (Check anethole)

3. Thin layer chromatography: Take 2g of wood powder (60 mesh), add 6ml of hexyl ether, cold soak for 4 hours, filter, concentrate the filtrate to dryness, and dissolve the residue in chloroform to 1 ml as the test solution; take anethole chloroform solution as the reference substance. Spot the samples on the same silica gel G-1% CMC thin layer plate respectively, develop with petroleum ether-hexyl acetate (8.5:1.5), use 2,4-dinitrophenylhydrazine reagent to develop color, and use the chromatography of the test solution in The same color spot appears as the corresponding position on the reference liquid chromatogram.