PAPILIONACEAE 113 



1. C. Bagittalis L. Rattle Box. 3'-20' high, erect, yillous ; leaves 

 oval-lanceolate : stipules united and deourrent on stem : peduncles bear- 

 ing 2-4 small, yellow flowers. — Quite common in dry open soil through- 

 out. June-August. 



3. MEDICAGO L. 



Stamens diadelphous with anthers all alike. Pods 1-several-seeded, 

 incurved or coilej. 



Flowers purple. 1. M. saliva. 



Flowers yellow ; pods reticulated. 2. M. lupuHna. 



Flowers yellow ; pods spiny. 3. M. dentimlata. 



1. M. sativa L. Alfalfa. Perennial, l°-3° high, upright, smooth : 

 leaflets oblong-obovate ; flowers raoemose-spieate : pods spirally twisted. — 

 Commonly adventized along railroads. May-September. 



2. M. lupulina L. Hop Medic. Annual, hairy, decumbent : leaflets 

 obovate : flowers spiked : pods 1-seeded, curved. — Locally naturalized 

 along railroads at Kansas City. May-September. 



3. M. denticulata Willd. Toothed Medic. Like the last but 

 glabrous, and the several-seeded pods prickly. — Collected as a waif at 

 Courtney. May-September. 



4. MELILOTUS Juss. Sweet Clover. 



Like Medieago but pods ovoid and not curved or coiled, indehisoent. 



Flowers white. " 1. M. alba. 



Flowers yellow. 2. M. officinalis. 



1. M. alba Desv. 3°-8° high : leaflets linear-oblong : flowers small, 

 numerous, in long racemes : standard longer than the wing. — Abundant 

 in waste places. May-September. 



2. M. ofScinalis (L.) Lam. Like the last but lower: standard and 

 wing equal.- — Locally common in waste places at Kansas City, Indepen- 

 dence, Leeds, Sheffield and Lee's Summit. May-September. 



5. TRIFOLIUM L. Clovee. 



Corolla withering-persistent. Stamens diadelphous. Pods small, in- 

 cluded in the calyx, indehiscent or tardily dehiscent, 1-6-ovuled. Stipules 

 united to the petiole. None of our species are native. 



Corolla reddish-purple. 



Heads sessile. 1. T. praiense. 



Heads stalked. 2. T. medium. 

 Corolla white or rose-colored. 



Plant erect or ascending. 3. T. hybridum. 



Plants creeping. 4. T. repens. 



1. T. pratense L. Eed Clover. 6''-24'' high, ascending, pubescent : 

 leaflets oval, entire, commonly dark-spotted near the middle : heads glo- 

 bose, 1' long, sessile : flowers sessile. — Common in fields and meadows. 

 May-September. 

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