PAPILIONACEAE 183 



Fugitive or adv. from Eu. — Pennsylvania: Blxks ; Philadelphia, 

 ballast. 



4. Medicago Arabica All. Spotted Medic. (Man. p. 538 ; I. F. J. 

 2o6j.) In waste places and ballast, N. B. to Pa. Also on the Pacific 

 Coast. Fugitive or adv. from Eu. — Pennsylvania: Philadelphia; 

 Delaware. 



7. MELILOTUS Juss. 



Corolla white : standard longer than the wings. i. M. alba. 



Corolla yellow : standard about as long as the wings. 2. M. officinalis. 



1. Melilotus alba Desv. White Melilot or Sweet Clover. 

 (Man. p. 539; I. F. f. 206S.) In waste places, eastern and central 

 United States. Adv. or nat. from Eu. and native also of Asia. — Penn- 

 sylvania : Monroe ; Bucks ; Montgomery ; Berks ; Chester ; Lan- 

 caster ; York ; Columbia ; Huntingdon ; Allegheny. 



2. Melilotus ofiBcinalis (L.) Lam. Yellow INIeliloT or Sweet 

 Clover. (Man. p. 539 ; I. F.y. 2o6().') Range of preceding species. — 

 Pennsylvania : Northampton ; Bucks ; Lancaster ; Allegheny. 



8. TRIFOLIUM L- 



Corolla yellow. 

 Stipules linear: leaflets sessile : racemes 12-1S mm. long. 



1. T. aureii7)i. 

 Stipules ovate : terminal leaflet stalked : racemes 6-12 mm. long. 



Standard conspicuously striate : racemes 20-40-flowered. 



2. T. prociimbens. 

 Standard scarcely striate : racemes 3-20-flowered. 3. T. dxibiunt. 



Corolla white, pink, red or purple. 



Racemes cylindric : calyx copiously pubescent, its lobes plumose. 



Corolla shorter than the calyx, white. 4. T. arvense. 



Corolla fully as long as the calyx, crimson. 5. T. incarnaliim. 



Raceme globular or ovoid : calyx glabrous or nearly so. 



Flowers short-pedicelled : racemes dense, head-like. 



6. T. prateyise. 

 Flowers slender-pedicelled : racemes umbel-like. 



Racemes over 2.5 cm. in diameter at maturity. 

 Plant annual or biennial, pubescent, not stoloniferous. 



7. T. reflexiim. 

 Plant perennial, glabrous, stoloniferous. 8. T. stoloniferum. 



Racemes less than 2 cm. in diameter at maturity. 

 Stems ascending or procumbent : corolla pink or purple. 



Corolla pink, much longer than the cal3-x : stems ascending. 



9. T. hybridum. 

 Corolla purple, about equalling the calyx : stems procumbent. 



10. T. Caroli7tia?ium . 

 Stems creeping : corolla white or essentially so. 



11. T. repcns. 



1. Trifolium auretun Poll. Yellow or Hop-clover. (Man. p. 

 539; I. V.f. sojo.) Along roadsides an,d in waste places, N. S., to Va., 

 west to Ont. and Iowa. Nat. from Eu. — Pennsylvania: MONROE ; 



