118 PULSE FAMILY. 



i- *- Petal only one. Stamens monadelphous only at the very base. 



17. AMOKPHA. Shrubs, with leaves of many leaflets. Standard (the other petals 



wholly wanting) wrapped around the 10 filaments and style. Flowers violet or 

 purple, in single or clustered terminal spikes. 

 K * Flowers (large and showy, in racemes) incompletely papilionaceous from the ivings 



or the keel also being small and inconspicuous. Pod several-seeded. 

 (31. ERYTHRINA. Herbs or shrubs, with 3 leaflets. Standard large and showy and 



mostly erect. Pod torulose or knotty.) 

 * * * Flowers obviously papilionaceous, all the parts conspicuously present. Stamens 



mostly diadelphous. 

 +- Herbage glandular-dotted. 



18. PSORALEA. Leaves of 3 or 5 leaflets. Flowers (never yellow) in spikes or racemes, 



often 2 or 3 under each bract. Pod ovate, thick, included or partly so in the 5-cleft 

 persistent calyx, often wrinkled. 



+- +- Herbage not glandular -dotted. 

 H- Pod not jointed (or very slightly so in No. 20) ; leaflets more than!; herbs, shrubs, 



or trees, never twining or trailing if herbs. 



= Perennial herbs (in ours}, mostly more or less hairy. 



o Standard broad. 



19. TEPHROSIA. Leaflets obliquely parallel-veined, often silky beneath, and white or 



purple flowers (2 or more in a cluster) in racemes ; the peduncles terminal or opposite 

 the leaves. Calyx 5-cleft or 5-toothed. Standard rounded, silky outside. Style in- 

 curved, rigid ; stigma with a tuft of hairs. Pod linear, several-seeded. 



20. SESBAN1A. Many pairs of leaflets, and minute or early deciduous stipules. Flowers 



in axillary racemes, or sometimes solitary, yellow. Calyx short, 5-toothed. Stand 

 ard rounded, spreading ; keel and style incurved. Pod usually intercepted internally 

 with cellular matte)- or membrane between the seeds. 



o o Standard narrow. 



21. INDIGOFERA. Herbs, or sometimes shrubby ; when pubescent, the close-pressed 



hairs are fixed by the middle. Flowers rose-color, purple, or white, in axillary 

 racemes or spikes, mostly small. Calyx 5-cleft. Standard roundish, often persis- 

 tent after the rest of the petals have fallen ; keel with a projection or spur on each 

 side. Anthers tipped with a little gland or blunt point. Pod oblong, linear, or of 

 various shapes, commonly with membranous partitions between the seeds. 



22. ONOBRYCHIS. Leaves odd-pinnate, of numerous leaflets. Flowers racemed, rose- 



purple. Pod flattish, wrinkled, and spiny-roughened or crested. 



23. ASTRAGALUS. Without stipels, and with white, purple, or yellowish rather small 



flowers in spikes, heads, or racemes ; peduncles axillary. Corolla narrow ; standard 

 erect, mostly oblong. Style and stigma smooth and beardless. Pod commonly tur- 

 gid or inflated, and within more or less divided lengthwise by intrusion of the back 

 or a false partition from it. 



= = Trees or shrubs. 



24. ROBINIA. Trees or shrubs, with netted-veined leaflets furnished with stipels, and 



often with sharp spines or prickles for stipules. Flowers large and showy, white or 

 rose-color, in axillary racemes. Base of the leafstalk hollow and covering the axillary 

 bud of the next year. Calyx 5-toothed, the two upper teeth partly united. Standard 

 large, turned back ; keel incurved, blunt. Ovary stalked in the calyx. Pod broadly 

 linear, flat, several-seeded, margined on the seed-bearing edge, the valves thin. 



25. CARAGANA. Shrubs, with mostly fascicled leaves of several pairs of leaflets, and a 



little spiny tip in place of an end leaflet; stipules minute or spiny. Flowers solitary 

 or 2-3 together on short peduncles, yellow. Calyx bell-shaped or short-tubular, 

 5-toothed. Standard nearly erect, with the sides turned back ; the blunt keel and 

 the style nearly straight. Pod linear, several-seeded. 



26. COLUTEA. Shrubs, not prickly, and no stipules to the leaflets ; the flowers rather 



large, yellow or reddish, in short axillary racemes. Calyx 5-toothed. Standard 



