Orobus niger is a hardy perennial, with which we have been acquainted for a number of years, and can recommend it as being pretty, with very dark purple flowers, which are produced in June and July; two or three feet high; stem branched; leaves in six pairs, ovate oblong; racemes one-sided, many-flowered.
O. atropurpureus. - The flowers are a fine purple, in a dense, one-sided, many-flowered raceme. In the gardens it is a hardy perennial, flowering in May.
O. luteus is considered by some as the handsomest of the papilionaceous tribe.