ILLUSTRATIONS. 



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Plate I. Seedlings of cowpea and catjang, showing relative size Frontispiece. 



II. Flowers and young pods of catjang 8 



III. Flowers and young pods of the asparagus bean and of the Cream 



cowpea 10 



IV. Fig. 1. — Photomicrograph of a section of extra-floral nectary of the 



cowpea flower. Fig. 2. — Two samples each of seven varieties of 



cowpeas, showing the different types of color distribution 20 



V. Seeds of sixteen varieties of Vigna, showing range in variation of 



shape, size, and color 22 



VI. Pods of catjang No. 22888 24 



VII. Pods of two varieties of cowpeas having curved or coiled pods 26 



VIII. Greenhouse-grown plant of Cream cowpea No. 0632, showing cyatho- 



phylly and other abnormalities of leaves 28 



IX. Pods of two varieties of cowpeas with kidney-shaped seeds 100 



X. Pods of two crowder varieties of cowpeas 114 



XI. Greenhouse-grown plant of cowpea No. 22958, showing the peculiar 



swelling on the base of the stem characteristic of this variety 120 



XII. Pods of two varieties of cowpeas with half crowder seeds 136 



229 

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