. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. eas can be usedas nitrogen gatherers, andtherefore, for green peas are treated as a haycrop, for the making of silageand is a cover crop. TheOntario Station after testingfor six years found a yield bushels per acre fromlarge seed and 23 bushels fromsmall seed. Cowpea {Vigna sinensis).—This plant is related to theasparagus bean (Vigna sesqiii- FiG. 86.—Cowpea. (Vigna sinensis) with pods p(,dalis) and tO the catjang and leaves. (After Mairs, T. J.: Some Soilin
. Textbook of pastoral and agricultural botany, for the study of the injurious and useful plants of country and farm. eas can be usedas nitrogen gatherers, andtherefore, for green peas are treated as a haycrop, for the making of silageand is a cover crop. TheOntario Station after testingfor six years found a yield bushels per acre fromlarge seed and 23 bushels fromsmall seed. Cowpea {Vigna sinensis).—This plant is related to theasparagus bean (Vigna sesqiii- FiG. 86.—Cowpea. (Vigna sinensis) with pods p(,dalis) and tO the catjang and leaves. (After Mairs, T. J.: Some Soiling ,.. . , , jt Crops for Pennyslvania, Bull, log, Pennsylvania \ vigna catjaug). Ihe dlf- Stale College Agricultural Experiment Station, ferences botanically by which 1911, p. 7. Oir gin ally on p. 17, U. S. Farmers ^i . ,...,, Bulletin 278, 1907.) these species are distmguished are comparatively slight, andthe species are connected through intermediate varieties. The cow-pea [Vigna sinensis) is an annual, prostrate, trailing to half-bushyplant having compound trifoliate leaves with broadly ovate FORAGE PLANTS OF THE FAMILY LEGUMIN0SJ2 201 The flowers are white, or pale violet with three bractlets at the base ofeach pedicel, and they are close pollinated, although the flowers are visitedby honey bees and bumble-bees attracted by the extrafloral pods are long, cyhndrical, cuived and usually constricted between themany seeds, which are bean-shaped, spotted, marbled and speckled witha dark circle around the white hilum. Some of the varieties of the cow-pea are Whippoorwill, Wonderful, New Era, Groit, Iron, Clay, Black,Taylor and Red Ripper (Fig, 86). Utility.—The cowpea is the most common legume planted in the entirecotton belt and it can be profitably grown much farther north. It isespecially suitable for combined hay and seed production, or for hayalone, and it is utilized for pasture and as a green manure for soil improve-ment. Cowpeas for hay pro
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