Where is Jesup's Milkvetch (Astragalus robbinsii var. jesupii)
located in the wild?
Astragalus robbinsii var. jesupii is reported only from rocky shores of the Connecticut River composed of phyllite or chlorite schist. Like other members of the Astragalus robbinsii complex, this variety is associated with rock that is rich in calcium and magnesium (U. S. Fish and Wildlife Service 1989, NatureServe 2001). The plants occur on moderately steep bedrock slopes that face east or southwest, in crevices and shelves where some litter and sediment has been deposited. The river shores where this plant can be found are periodically scoured by ice breaking up and floating down the Connecticut River in spring; thus, plants are sparse and few species that cannot tolerate such disturbance are present.Other associated species recorded in this boreal river shore outcrop community include: Senecio pauperculus (ragwort), Toxicodendron radicans (poison ivy), Poa compressa, Chrysanthemum leucanthemum, Hypericum perforatum, Solidago canadensis, Campanula rotundifolia, Erigeron pulchellus, Galium mollugo, Alnus rugosa, Ulmus americana, and Salix spp., as well as several rare or specialized calcium-loving plant species such as Allium schoenoprasum var. sibiricum, Carex garberi, Hypericum pyramidatum, and Tofieldia glutinosa.
Astragalus robbinsii var. jesupii is known only from Vermont and New Hampshire (Brackley and Thompson 1985, NatureServe 2001).
States & Provinces:
Jesup's Milkvetch can be found in New Hampshire, Vermont