162 American Midland Naturalist Monograph No. 2 



2. Leaflets 4-6, obtuse; gland between the lowest pair of leaflets; pods 10-15 

 cm. long, 2-5 mm. wide; waste ground, occasional; native of the tropics. 



July-Sept C. tora L. 



1. Corolla irregular, the petals unequal; calyx-lobes acuminate; anthers all per- 

 fect; stipules persistent; leaves sensitive to the touch; leaflets 12-28. 



5. Flowers 2-4 cm. broad, slender-pedicelled; anthers 10, unequal; fields and 

 meadows, common. July-Sept. Partridge-pea. [C. chamaecrista of auth., 

 not L.; C. robusta Pollard} C. jasciculata Michx. 



5. Flowers 5-10 mm. broad, short-pedicelled; anthers 5, nearly equal; woods 

 and fields, Cass Co., and southw. July-Sept C. nictitans L. 



7. Cladrastis Raf. — Yellow-wood 



C. luted (Michx. f.) K. Koch. Rich woods, s. 111., rare. Alexander Co., R. 

 B. Miller in 1928. 



8. Baptisia Vent. — Wild Indigo 



1. Leaves glabrous; racemes bractless or the bracts minute; calyx 6-8 mm. long; 

 pods ellipsoid, 2-3 cm. long; prairie soil and open woods throughout 111., 

 common. June-July B. leucantha T. & G. 



1. Leaves pubescent; racemes conspicuously bracted; calyx 8-10 mm. long; pods 

 ovoid, 4-5 cm. long at maturity; prairie soil and open woods, throughout 

 III. May-June B. leiicophaea Nutt. 



9. Crotalaria L. — Rattle-box 

 C. sagtttahs L. Dry soil, locally throughout 111.; more common southw. 

 June-Sept. 



10. Lupin us L. — Lupine 



L. perennis L. Sandy soil, local; n.e. 111., Lake, Cook, Kankakee, Grundy, 

 and Ogle counties. May-June. 



11. Trifolium L. — Clover 



1. Flowers white, purple, or pink. 



2. Flowers short-pedicelled, becoming reflexed in age. 



3. Heads 2.5-3 cm. broad. 



4. Leaves pubescent; plants annual or biennial; woods and fields, local. 

 May-June. Buffalo Clover T. reflexum L. 



4. Leaves glabrous; plants perennial, producing runners; roadsides and 



open woods, occasional. May-July T. stolonijerum Muhl. 



3. Heads less than 2.5 cm. broad. 



5. Flowers white; stems creeping and rooting, the peduncles arising 



from near the ground; fields, roadsides, waste places, lawns, open 



woods, common; nat. from Eur. May-June. White Clover 



T. repens L. 



5. Flowers pink or purple-tinged; stems erect or ascending, not rooting 

 from the nodes; fields, roadsides, and waste places; nat. from Eur. 



June-Sept. Alsike Clover T. hyhridiim L. 



2. Flowers sessile or nearly so, not becoming reflexed. 

 6. Heads cylindrical; calyx-teeth plumose-pubescent. 



