Phaseolus polystachios (L.) Britton et al.

Perennial, Herbs, Vines, twining, climbing, Stems woody below, or from woody crown or caudex, Plants with rhizomes or suckers, Tubers or tuberous roots present, Nodules present, Stems prostrate, trailing, or mat forming, Stems less than 1 m tall, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules green, triangulate to lanceolate or foliaceous, Stipules persistent, Stipules free, Leaves compound, Leaves pinnately 3-foliolate, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Stipels present at base of leaflets, Leaflets 3, Leaves glabrous or nearly so, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Bracts conspicuously present, Bracteoles present, Flowers zygomorphic, Calyx 5-lobed, Calyx 4-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals white, Petals pinkish to rose, Petals blue, lavander to purple, or violet, Banner petal suborbicular, broadly rounded, Banner petal auriculate, Wing petals narrow, oblanceolate to oblong, Keel abruptly curved, or spirally coiled, Keel tips obtuse or rounded, not beaked, Keel petals fused on sides or at tip, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Style spirally coiled, Style hairy, Fruit a legume, Fruit unilocular, Fruit freely d ehiscent, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit explosively or elastically dehiscent, Valves twisting or coiling after dehiscence, Fruit beaked, Fruit glabrous or glabrate, Fruit 3-10 seeded, Seeds ovoid to rounded in outline, Seeds reniform, Seed surface smooth, Seeds olive, brown, or black.

Phaseolus polystachios

Phaseolus polystachios, also known as the thicket bean or wild kidney bean, is a perennial, herbaceous vine that is native to North America. It is unique among the Phaseolus in that its native range extends across the eastern temperate United States to southeast Canada, while most Phaseolus are tropical or subtropical. It is the namesake for the Polystachios group clade, which is the most species-rich within Phaseolus (17 species). In spite of its common name, it is more closely related to the lima bean (Phaseolus lunatus), and it holds potential as a crop wild relative due to its resistance to white mold (Sclerotinia sclerotiorum).

Phaseolus polystachios là một loài thực vật có hoa trong họ Đậu. Loài này được (L.) Britton & al. miêu tả khoa học đầu tiên.