Order 46.— LEGUMINOUS PLANTS. 



191 



Leaves piiinately trifoliate. 



seeded, longer than the permanent calyx. 

 Flowers in racemes. 



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



as long as the yellow corolla. Pod 2-seeded. Stem 3f. 



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



as the white corolla. Pod 2-seedcd. Height d-fif. 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, diadelphons (9 & 1). 

 Legume short, membranous, often included 

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

 cent. — Herbs with palmately trifoliate 

 leaves. Leatlets straight-veined. Flowers 

 in heads or spikes. Apr.-Sejji. 



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



Pod 1-seeded 1, 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 S-10. 



1 T. procum'bens. Yelloio C. Stipules much shorter than the petioles. Style 3 or 



4 times shortcrthan thepod. Heads ovate, 4 in. thick. Stems prostrate. May. 



2 T. agra'rium. Larger Yellow C. Stipules longer than the petiole. Style about 



as long as the pod. Heads oblong, i in. thick. Stems ascending. Jane^July. 



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



than its tube. Legume 4-8eeded. 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. Fls. white, e. 

 T. reflexum. Bvffalo C. Lflts. obovate. Calyx nearly as long as the red corolla. 

 6 T. stolon: 'fe rum. Prairie C. Leaflets obcordate. Calyx not half as long as the 

 white corolla. W, 



453 O 



Fig, 44". Red Clover,— a head of 

 flowers. Fig. 44S. A single flower. 

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

 calyx. Fig. 450. A sc-ed, cut open. 

 See also Fig. 37. 



