112 



LEGUMINOS.E. 



ticulate. Flowers peifuct, sulitiiry, uv several in a raceme, spike, head, or soiuetiines 

 panicle. 



Our 16 genera rei.rcbciil idmosl half as many tribes, corresi^nding to llio inincipal divisions of 

 the I'oliowing key. . 



1. Stamens distinct. 



* Leaves digitalely a-t'oliolale. 



1. Thermopsia. Herbs, with consjiicuous stipules, and yellow Howers in racemes. 



2. Pickeriugia. Shrub, with minute stipules or none, und purple solitary Howers. 



♦ ♦ Leaves uneiiually pinnate : shrubby. 



3. Sophora. Tod thick, largo, .several-seeded, often transversely constricted : leaves coriaceous. 

 lo! Amorpha. Tod small, I - 2-seeded. Petal one 1 Stamens monudeliihous at the very buso. 



IL Stamens inonadelphous, or diadelphous (9 nnd 1). 



♦ Anthers of two forms : lilaments strictly monadelphous : loaves digitate, of more than 3 quite 



entire leallets. 



4. Lupinus. Calyx dee^ily bilabiate. Stundaid with recurved sides : keel falcate. Pod large, 



straight. 



* ♦ Anthers uniform. 



+- Leaflets 3, or rarely digitately 5 to 7, denticulate or sernilate : stamens diadelphous or nearly 

 so : pods small and enclosed in the calyx, or curved or coiled. 



5. Trifolium. Flowers capitate. Corolla persistent, uniteil with the filaments. Pod small, 



mostly in the calyx. , ^ , <• , • , o. , 



6. Melilotus. Flowers in axillary racemes or spikes, small. Petals tree, deciduous, tstyle 



filiform. Pod small, wrinkled, globular. 



7. Medicago. Flowers nearly of Melilolus. Pod spirally coiled or curved. Style subulate. 



H- -1- Leaves unequally pinnate (very rarely digitete or simple) ; leaflets entire : no tendril. 

 ++ Flowers umbellate or solitary, on an axillary peduncle. 

 8 Hosackia. Herbaceous or shrubby. Corolla yellow or i)artly white, or turnin" reddish : 

 claw of the slaudanl usually remote from the others. Pod linear, sevural-.sceded. 



■»(■+»• Flowers in spikes, racenuis, or houds, never umbellate. 

 -^ llorbago glandular-dotted : stamens mostly monadeli)hou3. 

 9. Pfloralea. Herbs, with 3-foliolato leaves and axillary spikes. Stamens mostly monadel- 

 phous. Pod indehiscent, one-seeded. Ovule solitary. 



10 Amorpha. Shrubs, with pinnate leaves and terminal or pamcled racemes. A\ ings and kee 



of the corolla wanting. Stamens monadelphous only at base, otherwise distinct. Pod 

 nearly indehiscent, 1 - 2-ovuled, 1 - '2-seeded. . , ., , , 



11 Dalea. Shrubby or herbaceous, with pinnate or simple leaves and terminal spikes or heads 



Wings and keel inserted on and articulated with the monadelphous stamen-tube. Pod 

 indehiscent, 2 - 6-ovuled, mostly one-seeded. 

 = = Herbage glandular or glutinous and more or less punctate : leaves unequally pinnate : sta- 

 ° ° mens diadelphous ; anthers confluently 1-celled. 



12. Glycyrrhiza. Flowers, &c., of Astnujalus. Pod prickly or muricate, short, 1-celled. 



= ^ = Herbage neither glandular nor dotted : stamens diadelphous ; anthers 2-celled : leaves 



pinnate. 



13. Astragalus. Herbs, unarmed. Pods mostly bladdery or turgid, or more or less 2-celled by 



intrusion of the dorsal suture. , i -, o 



14. Olneya. Tree, spinescent, nearly destitute of stipules. Pod 2-valved, several-ovuied, 1-2- 



seeded ; valves very thick und lirm. 

 -1- -1- -H Leaves abruptly pinnate, terminated by a tendril or bristle (occasionally by an imperfect 

 leaflet) : stamens diadelphous : peduncles axillary : pod 2-valved : seed-stalks broad or 

 expanded at the hilum : herbs. 



15. Vicia. Stamen-tubo obli(iue at the summit. Style lilifona, hairy around and below the 



16. Lathyrus. Stamen-tubo nearly truncate. Style dorsally flattened toward the apex, hairy 



ou the inner side, usually twisted half round. 



