Herbaceous shrubs, up to 1 m. Double pinnate compound leaves with 5-8 pairs of leaflets and short petioles; Stipules ovate-lanceolate, 2 ~ 4 mm long; Leaflets ovate-lanceolate to linear-lanceolate, apex acute, base slightly asymmetrical, glabrous or almost glabrous. Racemes are axillary, with 6 ~ 14 flowers; Pedicel base has elliptic bracts, which are easy to fall off; Sepals 5, oblong; Petals 5, obovate, yellow; Stamens 10, upper 3 small, sterile, middle 4 equal-length, lower 3 bent downward, anthers slightly square, arrow-shaped at the base, 4-loculed; The pistil is curved like a sickle, and the ovary is stipitate and sparse. The pod is flat and rectangular, with a length of 4 ~ 6 cm and a width of 1 ~ 1.7 cm. There are obvious spikes at the top of dorsal suture, chestnut brown skin, green edge and white hair when young. 4 ~ 7 seeds, slightly rectangular and flat, flat and slightly concave at the top, pockmarked wrinkles, brown-green, linear stalk. Flowering from September to 65438+February. The fruiting period is March of the following year.

Indian senna leaf

Also known as senna leaf. It is a dry leaflet of narrow leaf diarrhea in plants. Small leaves are relatively complete, and occasionally branchlets are mixed in. Petiole is about 2 mm long. Leaf blade ovate-lanceolate to linear-lanceolate, 2 ~ 4.5 cm long, 4 ~ 15 mm wide, entire, pointed at the apex and slightly asymmetrical at the base. The leaves are yellow-green, the back is light yellow-green, slightly hairy, and the veins on the back are raised. Leather, slightly hard, with transverse embossing in the midvein due to packaging and pressure. Weak and single-minded, slightly bitter.

Alexander senna leaf

Also known as: Egyptian senna. It is a dry leaflet of a plant with acute leaf diarrhea. Small leaves are often slightly curly, not very straight, and some are broken, and the petiole is very short; Leaf blade is broadly lanceolate or oblong, 2 ~ 4 cm long and 7 ~ 12 mm wide, with tip pointed or slightly convex, entire and asymmetrical base. The surface of leaves is light green, and the back of leaves is grayish green, slightly hairy and without embossing. Thin and brittle. The others are similar to the previous ones. For these two commodities, those with narrow and sharp leaves, large and complete leaves, green color, few stems and no mud and sand are the best, followed by those with small leaves, yellow stems, broken leaves and mud and sand.