Astragalus membranaceus, pinnately compound leaves, lobules 13-27, 5- 10 cm long; Petiole length 0.5- 1 cm; Stipules free, ovate, lanceolate or linear-lanceolate, 4- 10 mm long, white pilose or subglabrous below; Leaflets are oval or oblong-ovate, 7-30mm long and 3-12mm wide, with obtuse or slightly concave tips, small tips or inconspicuous, round base, green on the top, nearly hairless on the bottom.
Racemes are slightly dense, 10-20 flowers; The total pedicel is almost as long as or longer than the leaves, and it is significantly elongated in fruit. Bracts linear-lanceolate, 2-5 mm long, abaxially white pilose; Pedicel 3-4 mm long, slightly densely brown or black pilose along inflorescence axis; Bracteoles 2; Calyx bell-shaped, 5-7 mm long, white or black pilose outside, sometimes the calyx tube is nearly hairless, only the calyx teeth are hairy, the calyx teeth are short, triangular to subulate, and the length is only1/4-1/5 of the calyx tube; Corolla yellow or light yellow, flag petal obovate, long12-20mm, slightly concave at the top, short stem base, short spike at the base, stem about 1.5 times longer than petal, keel petal nearly long, petal semi-ovoid, stem slightly longer than petal; Ovary stipitate and puberulent.
The pod is membranous, slightly enlarged, semi-oval, 20-30 mm long and 8- 12 mm wide, with spines at the top, white or black villi on both sides, and the fruit neck beyond the calyx; 3-8 seeds. The flowering period is from June to August, and the fruiting period is from July to September.
Extended data:
Astragalus membranaceus is produced in Inner Mongolia, Shanxi, Gansu, Heilongjiang and other places, and is a national third-class protected plant. Astragalus membranaceus has been used as medicine for more than 2000 years, which has the functions of enhancing immune function, protecting liver, diuresis, anti-aging, anti-stress, lowering blood pressure and extensive antibacterial. However, it is forbidden for patients with exterior pathogenic excess, stagnation of qi and dampness, stagnation of food, initial stage of excessive heat and toxin or after ulcer, and hyperactivity of yang due to yin deficiency. Due to long-term excavation, the number of wild Astragalus membranaceus has dropped sharply in recent years and is on the verge of extinction. Therefore, it is determined that this plant is an endangered species and a national third-class protected plant.
Like cool, cold, drought, heat and waterlogging, it is suitable for planting in sandy loam with deep soil layer, rich humus and strong water permeability. Strong saline-alkali soil is not suitable for planting. The vertical growth of roots can reach more than 1 m, which is commonly known as "zaobianqi". Soil sticky roots grow slowly and are deformed; The soil layer is thin, with many roots and branches, which is a "chicken claw" with poor quality. Avoid continuous cropping, and it is not suitable to rotate with potatoes and flax. The hard rate can reach 30%-60%. In the first year of direct seeding, only stems and leaves grow, and flowers and seeds can be produced in the second year without flowering.
References:
Astragalus? Baidu baike