ORIIKR 40. LEGUMINOUS PLANTS. 



197 



.seeded, longer than the permanent calyx. Leaves pinnate.y trifoliate 

 Flowers in racemes. 



1 M. officina'lis. Yellow M. Leaflets obovate-oblong, obtuse, dentate. Calyx Lall 



as long as the yellow corolla. Pod 2-seeded. Stem 8f. 



2 M. alba. White M. Leaflets ovate-oblong, square at end. Calyx not half as long 



as the white corolla. Tod 2-seeded. Height 4-6f. Very fragrant. 



5. TRIFO'LIUM. Clover. Trefoil. 



Calyx 5-cleft, with bristly teeth, persist- 

 ent Petals more or less united at the base, 

 persistent and withering. Banner longer 

 than the wings, which are also longer than 

 the keel. Stamens 10, diadelphous (9 & 1). 

 Legume short, membranous, often included 

 in the calyx, 1-6-seeded, mostly indehis- 

 cent. Herbs with palrnately trifoliate 

 leaves. Leaflets straight-veined. Flowers 

 in heads or spikes. Apr.-Sept. 



449 



450 



Fig, 447. Red Clover, a head of 

 flowers. Fig. 44S. A single flower. 

 Fig. 449. A pod, with a part of the 

 calyx. Fig. 450. A seed, cut open. 

 See also Fig. 37. 



* Flowers yellow, in small, dense, oval heads. 



Pod l-seeded....l, 2 



* Flowers cyanic (not yellow). . . .a 



a Flowers on little stalks (pedicels) and 



finally deflexed b 



a Flowers nearly or quite sessile, never de- 

 flexed c 



b Heads small, on stalks some ten times longer 3, 4 



b Heads large, on stalks two or three times longer 5, 6 



c Calyx teeth feathery, longer than the whitish corolla. . . .7 

 c Calyx teeth shorter than the purple or roseate corolla. . . .8-10. 

 . T. procum'bens. Yellow 0. Stipules much Shorter than the petioles. Style 3 or 

 4 times shorter than the pod. Heads ovate, 4 in. thick. Stems prostrate. May. 

 9 T. agra'rium. Larger Yellow 0. Stipules longer than the petiole. Style abou- 

 as long: as the pod. Heads oblong, i in. thick. Stems ascending. June, July. 



3 T. Carolinia'num. Southern G. Stipules leaf-like. Calyx teeth thrice longer 



than its tube. Legume 4-seeded. Scarcely forms a turf. W. S. 



4 T. repens. White C. Shamrock. Stipules narrow, scale-like. Calyx teeth 



shorter than its tube. Pod 4-seeded. Forms a dense turf. FIs. white, c. 

 T. reflexum. Buffalo G. Lflts. obovate. Calyx nearly as long as Jie red corolla. 

 I T. stoloni'feram. Prairie C. Leaflets obcordate. Calyx not half as long as the 

 white corolla. W 



