The Flora of the Cayuga Lake Basin 273 



6. Trifolium (Tourn.) L. 



a. Flowers sessile ; heads dense ; corolla pink or purple. 



b. Stems closely creeping and rooting ; calyx much inflated in fruit ; corolla rose- 

 pink. 1. T. fragiferum 

 b. Stems erect or ascending, not rooting at the nodes ; calyx not inflated in fruit 

 or only slightly so. 

 c. Calyx teeth plumose, longer than the pale pink corolla. 2. T. arvense 

 c. Calyx teeth villous or glabrate, shorter than the pinkish purple corolla. 



3. T. prat en se 

 a. Flowers pedicelled ; heads looser. 

 b. Corolla white or purple. 

 c. Stems closely creeping and rooting, the peduncles arising from the ground ; 



heads white. 4. T. repens 



c. Stems erect or ascending, not rooting at the nodes ; leaves larger ; heads 

 mostly purple-tinged. 5. T. hybridum 



b. Corolla yellow. 

 c. Terminal leaflet sessile ; plant erect ; heads many-flowered ; corolla striate. 



6. T. agrarium 

 c. Terminal leaflet stalked ; plant diffuse and weak. 

 d. Heads many-flowered; corolla striate. 7. T. procumbens 



d. Heads 5-12-flowered ; corolla scarcely striate ; plant very slender. 



8. T. dubium 



1. T. FRAGIFERUM L. STRAWBERRY CLOVER. 



A well-established weed in the lawn near Roberts Hall, C. U. campus, 1923. 

 Apparently not reported from elsewhere in the U. S. Adventive from Eu. 



2. T. arvense L. Rabbit-foot Clover. 



Fields and roadsides, in dry acid sandy soils; rare. Aug. 15-Sept. 15. 



Field, top of hill s. of upper Buttermilk reservoir, 1916 (K. M. W. & F: P. 

 Metcalf) ; grassy knoll, Highland Ave. near Upland Road, Cayuga Heights, 1915- 

 1916; w. of Lowery Ponds. 



Que. and Ont. to Mo., southw. to Fla. and Tenn. ; common along the coast. 

 Naturalized from Eurasia. 



3. T. pratense L. Red Clover. 



Fields and roadsides, in rich soils ; common, but less so than formerly. June-Oct. 



Cultivated, and extensively escaped. 



Widely naturalized in N. A. Native of Eurasia. 



[T. INCARNATUM L. 



Has been found a few times as a temporary escape from cultivation.] 



4. T. repens L. Creeping White Clover. 



Lawns and roadsides, in rich soil ; very common. June-Oct. 

 Common in cultivation, and extensively escaped. 

 Widely naturalized in N. A. Native of Eurasia. 



5. T. HYBRIDUM L. ALSIKE CLOVER. 



Fields and roadsides, in rich heavy soil ; very common. June-Aug. 

 Common in cultivation, and extensively escaped. First noted as an escape at Mc- 

 Lean and Ithaca in 1878 (£>.). 

 Widely naturalized in N. A. Native of Eu. 



