PAPILIONACEA'E 183 



Fugitive or adv. from Eu. — Pennsylvania : Bucks ; Philadblphia, 

 ballast. 



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

 2067. ) In waste places and ballast, N. B. to Pa. Also on the Pacific 

 Coast. Fugitive or adv. from 'Bn.— Pennsylvania : Pifli,ADEl<PHlA ; 

 Dbi,aware. 



7. MELILOTUS Juss. 



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



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



1. MelilotUB alba Desv. White MEWtOT OR SwEET CLOVER. 

 (Man. p. 539; I. P. /. 2068.) 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. MelilotUB ofBcinalis (L.) Lam. YELLOW MeliloT or SweET 

 Clover. (Man. p. 539 ; 1. F./. 2o6p.) Range of preceding species. — 

 Pennsylvania : Northampton ; Bucks ; Lancaster ; Allegheny. 



8. TRIFOLIUM L- 



Corolla yellow. 

 Stipules linear: leaflets sessile : racemes 12-18 mm. long. 



1. T. aureum. 

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



Standard conspicuously striate : racemes 20-40-flowered. 



2. T. procumbens. 

 Standard scarcely striate : racemes ,^-20-flowered. 3. T. dubium. 



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. incarnatum. 



Raceme globular or ovoid : calyx glabrous or nearly so. 

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



6. T. pratense. 

 Flowers slender-pedicelled : racemes umbel-like. 



Racemes over 2. 5 cm. in diameter at maturity. 

 Plant annual or biennial, pubescent, not stoloniferous. 



7. T. reflexum. 

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



Racemes Jess than 2 cm. in diameter at maturity. 

 Stems ascending or procumbent : corolla pink or purple. 

 Corolla pink, much longer than the calyx : stems ascending. 



9. T. hybridum. 

 Corolla purple, about equalling the calyx : stems procumbent. 



10. T. Carolinianum . 

 Stems creeping : corolla white or essentially so. 



11. T. repens. 



1. Trifolium aureum Poll. YELLOW or Hop-clover. (Man. p. 

 539; I. F.y. 2oyo.) Along roadsides and in waste places, N. S., to Va., 

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



