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Tennessee Milkvetch

Astragalus tennesseensis Gray ex Chapman

Physical Description

provided by USDA PLANTS text
Perennial, Herbs, Stems woody below, or from woody crown or caudex , Taproot present, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stems hairs pilose or spreading, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules green, triangulate to lanceolate or foliaceous, Stipules membranous or chartaceous, Stipules persistent, Stipules free, Stipules connate to each other, forming a tuber or sheath, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Inflorescence or flowers lax, declined or pendulous, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals ochroleucous, cream colored, Banner petal narrow or oblanceolate, Wing petals narrow, oblanceolate to oblong, Win g tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Style persistent in fruit, Fruit a legume, Fruit stipitate, Fruit tardily or weakly dehiscent, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, Fruit rugose wrinkled or reticulate, Fruit fleshy, Fruit coriaceous or becoming woody, Fruit exserted from calyx, Fruit beaked, Fruit hairy, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.
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Astragalus tennesseensis

provided by wikipedia EN

Astragalus tennesseensis is a species of flowering plant in the legume family known by the common name Tennessee milkvetch. It is native to the United States, where it is known from Illinois, Indiana, Tennessee and Alabama.[1] Most of the occurrences are in Tennessee.[2]

This plant produces cream-colored flowers in April and May.[1] The seedlings grow slowly and several years pass before the plants reach reproductive maturity.[3] The species is adapted to drought, remaining metabolically active in habitat that is dry over the summer.[4]

This plant has been nearly extirpated from Illinois and Indiana, but it has been reintroduced there in a few select populations.[1] Some natural populations have been rediscovered in Illinois.[2]

The plant grows in cedar glades and glade ecotones[2] and open prairies.[1] It may be found in the partial shade of Juniperus virginiana,[5] but it does not tolerate heavy shade.[6]

This species is unique within genus Astragalus and it is the only species in section Tennesseensis.[6]

References

  1. ^ a b c d Astragalus tennesseensis. Archived October 26, 2011, at the Wayback Machine Center for Plant Conservation.
  2. ^ a b c Astragalus tennesseensis. The Nature Conservancy.
  3. ^ Baskin, C. C., et al. (1972). Observations on the ecology of Astragalus tennesseensis. American Midland Naturalist 88(1) 167-82.
  4. ^ Baskin, C. C. and J. M. Baskin. (1974). Responses of Astragalus tennesseensis to drought. Changes in free amino acids and amides during water stress and possible ecological significance. Oecologia 17(1) 11-16.
  5. ^ Edwards, A. L., et al. (2004). Genetic diversity in Astragalus tennesseensis and the federal endangered Dalea foliosa (Fabaceae). Archived 2012-03-16 at the Wayback Machine Journal of the Torrey Botanical Society 131(4) 279-91.]
  6. ^ a b Baskin, J. M. and C. C. Baskin. (2005). Ecology of two geographically restricted Astragalus species (Fabaceae), A. bibullatus and A. tennesseensis, of the eastern United States. Brittonia 57(4):345-353.

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Astragalus tennesseensis: Brief Summary

provided by wikipedia EN

Astragalus tennesseensis is a species of flowering plant in the legume family known by the common name Tennessee milkvetch. It is native to the United States, where it is known from Illinois, Indiana, Tennessee and Alabama. Most of the occurrences are in Tennessee.

This plant produces cream-colored flowers in April and May. The seedlings grow slowly and several years pass before the plants reach reproductive maturity. The species is adapted to drought, remaining metabolically active in habitat that is dry over the summer.

This plant has been nearly extirpated from Illinois and Indiana, but it has been reintroduced there in a few select populations. Some natural populations have been rediscovered in Illinois.

The plant grows in cedar glades and glade ecotones and open prairies. It may be found in the partial shade of Juniperus virginiana, but it does not tolerate heavy shade.

This species is unique within genus Astragalus and it is the only species in section Tennesseensis.

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Wikipedia authors and editors
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wikipedia EN