伊州合欢草

Perennial, Shrubs, Herbs, Taproot present, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Stems 1-2 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Extrafloral nectary glands on petiole, Stipules conspicuous, Stipules setiform, subulate or acicular, Stipules persistent, Stipules free, Leaves compound, Leaves bipinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves glabrous or nearly so, Leaves hairy on one or both surface s, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Bracts very small, absent or caducous, Flowers actinomorphic or somewhat irregular, Calyx 5-lobed, Calyx glabrous, Petals united, valvate, Petals white, Petals greenish yellow, Imperfect flowers present, dioecious or polygamodioecious, Fertile stamens 5, Stamens completely free, separate, Stamens long exserted, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit freely dehiscent, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit glabrous or glabrate, Fruit 2-seeded, Fruit 3-10 seeded, Seed with elliptical line or depression, pleurogram, Seed surface smooth, Seeds olive, brown, or black.