FABACEAE. 163 



Corolla yellow : ovary and pod decidedly stipitate. 



Standard entire : terminal leaflet longer-stalked than the lateral ones. 



1. T. procumhens. 

 Standard toothed : terminal leaflet not longer-stalked than 



the lateral ones. 2. T. agrarium. 



Corolla white, pink, or purple : ovary and pod sessile or nearly so. 

 Heads peduncled : claw of the standard shorter than the 

 blade. 

 Corolla shorter than the calyx. 3. T. arvcnse. 



Corolla longer than the calyx. 



Heads cylindric : calyx-lobes plumose. 4. T. incarnatum. 



Heads globose or ovoid : calyx-lobes not plumose. 



Calyx-lobes subulate, not dilated, the sinuses 



pubescent : stems ascending or procumbent. 5. T. hybridum. 



Calyx-lobes lanceolate or triangular, with dilated 



bases, the sinuses glabrous : stems creeping. 6. T. repens. 



Heads sessile : claw of the standard longer than the blade. 7. T. pratcnse. 



1. T. procumbens L. Stem and branches ultimately diffuse or proeumbent: 

 leaflets 6-12 mm. long; blades cuneate to obovate: stipules short, the free 

 parts ovate: standard less than 4.5 mm. long: seeds pale. — Common, on dry 

 banks and roadsides. Nat. of Eu. — Sum. — Low hop-clover. 



2. T. agrarium L. Stem and branches erect, ascending or reclining: leaflets 

 lG-30 mm. long; blades oblong-cuneate, rhombic, or obovate: stipules long, 

 the free parts lanceolate: standard over 5.5 mm. long: seeds dark. — Common, 

 on roadsides and banks and in woods. Nat. of Eu. — Sum. — Yellow hop- 

 clover. 



3. T. arvense L. Stems erect, villose-lanuginous: leaflets 1-2.5 cm. long; 

 blades linear to oblanceolate, entire or nearly so: heads 1-3 cm. long: calyx 

 4.5-5 mm. long; lobes subulate, plumose: standard nearly oblong, 3-3.5 mm. 

 long, white. — Common, on dry banks and in fields. Nat. of Eu. — Sum. — ■ 

 Eabbit-foot clover. Stone-clover. 



4. T. incarnatum L. Stems 2-9 dm. tall, appressed-pubescent or somewhat 

 villose: leaflets 1-4 cm. long; blades obovate to broadly cuneate, denticulate, 

 finely veined: heads 3-7 cm. long: calyx densely strigillose, obscurely 2- 

 lipped; lobes setaceous, longer than the tube, those of the upper lip slightly 

 longer than those of the lower lip: standard 11-13 mm. long, linear-spatulate, 

 crimson. — Common, in fields and waste places. Nat. of Eu. — Spr. — Crim- 

 son-clover. Italian-clover. 



5. T. hybridum L. Stems erect or decumbent: leaflets 11-25 mm. long; 

 blades oval to oblong, varying to ovate or obovate, or suborbicular, denticu- 

 late: calyx 3.5-4 mm. long; lobes about as long as the tube: standard oblong, 

 7-9 mm. long, pink or rarely nearly white : style mostly shorter than the ovary. 

 — Common, in fields and on roadsides. Nat. of Eu. — Sum. — Alsike-clover. 



6. T. repens L. Stems creeping: leaflets 9-15 mm. long; blades obovate to 

 orbicular-obovate or oval : calyx about 5 mm. long ; shorter lobes abruptly 

 acuminate from dilated bases: standard oblong, 7-8 mm. long: style mostly 

 longer than the ovary. — Common, in fields and waste places and on roadsides. 

 Nat. of Eu. • — Spr. and sum.- — ^^ White- clover. 



7. T. pratense L. Stems 2-7 dm. tall, pubescent: leaflets 1-4 cm. long; blades 

 oblong, elliptic, or oval: calyx about 8 mm. long; lobes filiform, the largest 

 one much longer than the tube: corolla red, purple, or white; standard 12-14 

 mm. long, the claw very broad. — Common, in fields and waste places. Nat. of 

 Eu. — Sum. — Eed-clover. 



8. ANTHYLLIS [Eivinius] L. Herbs with diffuse branches. Leaflets 

 few or several, pinnately disposed, or the lateral ones sometimes wanting. 

 Flower-clusters involucrate, approximate, the compound cluster long-peduncled. 

 Calyx manifestly 2-lipped : upper lip with broad, short lobes; lower lip with 



