154 PRACTICAL BOTANY. 



Stamens unequally diadelphous (9 and 1). Calyx 

 5-cleft. Pods of several roundish joints. Leaflets 13-21. 

 Stipules scaly. Raceme of many deflexed, purple flowers. 



Hedysarum boreale, Nutt. 



346. Calyx 2 -lipped. Stamens diadelphous (or mona- 

 delphous only below). Pod 2- to several-jointed. Flowers 

 all of one sort, and complete. Leaflets stipellate. Flowers 

 in axillary or terminal racemes, often panicled, purple or 

 purplish. Desmodium. 



Calyx nearly regularly 5-cleft, the lobes slender. 

 Pod 1-jointed (sometimes 2-jointed, with the lower joint 

 empty or stalk-like). Stipules and bracts minute. Flowers 

 either of two sorts, the fertile ones apetalous, in panicles or 

 clusters, or all alike and perfect, in close spikes or heads. 

 Corolla violet- purple, or whitish, with a purple spot on the 

 standard. Lespedeza. 



24:7. Twining or trailing plants. Leaves pinnately 3-, 

 rarely 5- to Y-foliolate, mostly stipellate, without tendrils. 

 Cotyledons thick and fleshy, becoming leafy in germination, 

 but not in Wistaria. Flowers often clustered in racemes.248 



Erect, or rarely prostrate plants, the latter with 

 palmately 3-foliolate leaves. Cotyledons thin, not becoming 

 leafy in germination 255 



348. Keel primarily, or at length spirally twisted. 

 Herbs 249 



Keel not twisted 250 



349. Leaves 3-foliolate, stipellate. Keel primarily twisted 

 with the stamens. Flowers often clustered on the knotty 

 joints of the raceme. Phaseolus. 



Leaves 5- to 7-foliolate, not stipellate. Keel at 

 first incurved, at length twisted. Subterranean shoots 

 bearing eatable tubers. Leaflets ovate-lanceolate. Flowers 

 brown-parple, in dense and short, often branching racemes. 



Apios tuberosa, Mcench. 



350. Leaves pinnately 9- to 1 3-foliolate, not stipellate. 

 Keel scythe-shaped. Standard roundish, reflexed, large, 

 with 2 callosities at the base. Wings with 2 auricles below. 



