Plant properties
Indigo (scientific name: Isatis indigotica Fortune)
Herbs biennial, plant height 50-100cm. Smooth is cream. Root hypertrophy, nearly conical, diameter 2-3cm, length 20-30cm, surface yellowish, with a short horizontal stripes and a few fibrous roots. Basal leaves rosulate, leaf blade oblong to broadly oblanceolate, 5-15 cm long, 1.5-4 cm wide, apex blunt, margin entire, or slightly shallowly corrugated, with rounded auricles or inconspicuous The top leaves of the stem are broadly stripe, entire, sessile. Racemes terminal or axillary, conical at branch apex; bracts 4, broadly ovate or broadly lanceolate, 2-3 mm long; petals 4, yellow, broadly cuneate, 3-4 mm long, apex nearly flat, Edge margin entire, base with inconspicuous short claws; stamens 6, 4-2 short, long stamens 3-3.2mm long, short stamens 2-2.2mm long; pistil 1, ovary nearly cylindrical, style not conspicuous, stigmas Truncated. The short-horned fruits are suborbicular, flattened, glabrous, margins with membranous wings, especially with wings wider at both ends, and fruit veins with midvein. One seed, oblong, light brown. Flowering from April to May, fruiting from May to June.
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