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Morphological characteristics

Peanut roots as a cone, buried up to 2 meters, but are mainly distributed in the ground about 30 cm under the tillage layer. The root of the Health 1 ~ 3 mm diameter of cowpea Rhizobium family. Main stem erect, green, some varieties with different shades of procyanidins, in the upper part was angular, hollow. Main stem due to a high degree of variety and cultivation conditions, up to 1 m high or more.30กใกซ90กใกฃ Usually higher than the vertical-type peanut main stem branches prostrate or semi-spreading type than the main stem is a long branch. 1 branch 2 on the Health and inflorescence branches. Leaves alternate, even-pinnate to 4 microphylla leaf, some species can also see more abnormal lobular leaves, petiole and stipule has small oval leaves, long-oval, it was oval eggs and wide, there are slender lobule lanceolate, leaf surface than the smooth, slightly dorsal gray, the main vein at the obvious, there are hairs, petioles and leaves have lobular occipital base, you can feel the light stimulation of leaf parenchyma cells pillow turgor changes, leading to lobular day night closed, closed down when the petiole.
Raceme, each inflorescence is generally a Health 4 ~ 7 flowers, and more up to more than 10 flowers formed long, Papilionaceae, orange yellow, the flag flap with different extent of purple stripes. Stamens 10, the degradation of 2, 8 with anther. Feathered stigma, ovary ovary stalk at the base there, after fertilization of a group of meristematic cells can quickly split, about 3 to 6 days after the formation of the green with purple elongation of the stick-like, said needle fruit generally 10 ~ 15 cm long . Sometimes we can see the base of the calyx tube in fruit set of pin-pin end, the walk has been wilting after fertilization of the flower. At this time the ovary is located at the tip end of the needle fruit, there are a number of cells outside of the cap-like protection. Peanut will begin to grow after flowering red purple head as sharp as the aerial roots of the ovary stalk, and its cutting-edge into the soil will form a milky white in small pods (pods of peanut), peanut seeds of fruit needle geotropism after elongation growth, will ovary into the soil, up to a certain depth, the ovary to the horizontal direction and the formation of pod growth and development. At this time the need for dark conditions. Pod is also a certain degree of absorptive capacity, the development of the calcium needed by the pod directly absorbed from the soil. Fruit buried the needle on the ease with plants on the location of the students. Flowering parts are too high or too delicate stem sticks, easy to change the event location when wind and rain, thereby affecting the fruit geotropism needle's point of view, buried more difficult. Prostrate needle-type peanut fruit from soil surface as a result of the past, point of view appropriate the highest rate of buried pod. Numerous type of vertical or peanuts between the short side, such as stem, main stem near the base of more than a row of flowering branches and can have a higher rate of buried pod.
Matteuccia hard shell, after mature cracking, interventricular septum and no transverse constriction (waist fruit). Each pod has 2 to 6 seeds, 2 in the majority, mostly ordinary type, ax type, or cocoon-shaped gourd. More than 3 per pod seed pod songs mostly stick-shaped or bead-type.generally 50 to 200 grams. Shell-like surface Veining network. Seed triangle, peach, cylindrical or oval-shaped, generally at the bottom of a round or slightly flat blunt, prominent radicle tip end. Seed coat white, pink, red, reddish brown, purple, red, white or different colors such as white. Cotyledons of the total weight of seeds accounted for 90%. Germ two hidden in the middle of hypertrophy of the cotyledons, shoot from the main section and two lateral bud composition of cotyledons.