Morphological characteristics of peanut

An annual herb. The roots are rich in nodules; Stem erect or creeping, 30-80 cm long, stem and branches are prism, yellow puberulent, later glabrous.
Leaves usually leaflet 2 pairs; Stipule 2-4 cm long, longitudely veined, coat; Petiole base aspirate, 5-10 cm long, coat; Leaflet papery, ovate-oblong to obovate, 2-4 cm long, 0.5-2 cm wide, apex obtuse, sometimes slightly concave, spikelets, base suborbicular, entire margin, covered on both sides, margin lashes; Lateral veins about 10 on each side; The edges of the veins are connected with each other into a network; Petioles 2-5 mm long, covered with long yellowish-brown hair.
Flowers about 8 mm long; Bracts 2, lanceolate; Bracteoles lanceolate, ca. 5 mm long, longitudinally veined, puberulent; Calyx tubes are thin, 4-6 cm long; Corolla yellow or golden yellow, pennant 1.7 cm in diameter, spreading, apex concave; The wing flap is separated from the keel flap, the wing flap is oblong or obliquely ovate, slender; Keel valve oval, curved, apex tapered into a beak, shorter than the wing; Style extending beyond calyx pharynx, stigma terminal, small, sparsely puberulent.
The pod is 2-5 cm long and 1-1.3 cm wide, swollen, with a thick pod and 0.5-1 cm transverse diameter of the seed. [2] The pod shell is hard, does not crack after maturity, and has constriction (fruit waist) without transverse compartments. Each pod has 2 to 6 seeds, most of which are common, axe, gourd or cocoon-shaped. The pods with more than 3 seeds per pod were mostly stick shaped or beaded. The weight of 100 grains is generally 50-200 grams. There are network veins on the surface of the shell. Seeds triangular, peach-shaped, cylindrical or oval, generally blunt or slightly flat at the base, radicle protruding at the tip. The seed coat is white, pink, red, reddish-brown, purple, red and white or purple and white. Cotyledon accounts for more than 90% of the total seed weight. The germ is hidden in the middle of two hypertrophic cotyledon, consisting of the main bud and two cotyledon node lateral buds. Fruit period from June to August.