272 



LEGUMINOSAE (PEA FAMILY) 



2. SOPHORA L. ' 



Ours are herbs with coriaceous odd-pinnate leaves with numerous entire 

 leaflets. Stipules small or obsolete. Flowers white, in terminal racemes. 

 Calyx campanulate; its teeth short. Petals nearly equal; the standard broad. 

 Pod stipitate, large, thick, terete or somewhat compressed, several-seeded, 

 often somewhat transversely constricted. 



1. Sophora sericea Nutt. Gen. 1: 280. 1818. Low, 1-3 dm. high, more or 

 less silky-canescent: leaflets about 21, elliptic or cuneate-oval: racemes short, 

 at first scarcely exserted beyond the leaves: calyx gibbous at base. — High 

 plains of Colorado and northward along the plains of the Platte and the Mis- 

 souri. 



3. LUPINUS L. Lupine 



Generally herbaceous, with 5 or more digitately arranged entire leaflets. 

 Stipules adnate to the petioles. Flowers in terminal racemes, verticillate or 

 scattered, bracteate. Calj^ 2-lipped. Standard with recurved sides; wings 

 united above, inclosing the falcate keel. Filaments strictly monadelphous; 

 anthers of two forms. Pod large, straight, compressed, 2-valved, coriaceous. 



Annuals; ovules only 2. 



Coarsely hirsute; stem branched 1. L. pusilliis. 



Softly hirsute; subacaulescent 2. L. brevicaulis. 



Perennials; ovules more than 2. 

 Dwarf and caespitose (5-15 cm. high). 



Racemes surpassed by the leaves 3. L. caespitosujs. 



Racemes surpassing the leaves 4. L. Kingii. 



Medium to large, usually 2 dm. or more high. 

 Flowers conspicuously bicolored. 



Leaflets green, appressed-pubescent beneath 

 Leaflets canescent, pubescent on both faces. 

 Racemes lax, verticils distant 



Racemes dense 



Flowers often bi- or tri-colored but not strikingly so. 

 Herbage conspicuously canescent or rough-hoary. 



Pubescence dense and white, spreading or subap- 

 pressed. 

 Racemes large and long (1-3 dm.) .... 

 Racemes short, terminating divaricate branches . 

 / Pubescence sericeous, mostly appressed. 



Flowers blue 



Flowers violet • , 



Herbage green or greenish, at least in part. 

 Pubescence of stem and petioles appressed. 

 Leaflets glabrous above or nearly so. 



Linear-oblong or oblanceolate, usually folded. 

 Raceme solitary or several in a terminal fascicle 

 Racemes terminating the stem and divaricate 

 branches. 

 Stems usually solitary; pubescence scanty . 

 Stems tufted; pubescence silky-apprised . 

 Oblong to oblanceolate or broader, mostly flat. 

 Stems branched above. 



Flowers blue , , • 



Flowers violet . . • 

 Stems mostly 8imi}le, 



Calyx scarcely gibbous . , 

 Calyx conspicuously ^bbous 

 Leaflets pubescent on both sides. 

 Stems purplish-red 

 Stems green or greenish. 



Tufted and low (2 dm. or less) . 

 Taller, usually 3-6 dm. high. 



Basal-leaves abundant and long-petioled 

 Basal leaves wanting, or smaU and short- 

 petioled. 

 Stems densely tufted .... 



Stems mostly solitary .... 



Pubwcence of stem and petioles hirsute (if any), 

 spreading or reflexed. 

 More or less rough-hirsute. 



Raceme as long as the leaf-bearing part of the 



stem . . ..... 24. L. ammophilus. 



5. L. plattensis. 



6. L. dichrous. 



7. L, omatus 



S. L. leucophyllus. 



9. L. ramosus. 



10. L. flexuosus. 



11, L. Greenei. 



12. L. floribundus. 



13. L, parviflorus. 



14. L. argehteus. 



15. L. decumbens. 



16. L. alsophilus. 



17. L. alpestris. 



18. L. pseudoparviflonUi 



19. L. rubricaulis, 



20. L. monticola. 



21. L. humicola. 



22. L. laxiflorus, 



23. L. Bakeri. 



