222 LEGUMINOSAE. 



cinnamon. Cattle avoid the herbage and the pods are said to be poisonous to 

 sheep. 



2. M. indica All. Yellow Melilot. Main stem erect, with many rather 

 spreading branches from above the base; leaflets broadly or narrowly cuneate- 

 obovate, dentate or serrate but entire below the middle, truncate or retuse at 

 apex; | ■_. tp l'i in. long; racemes 1 to 2 in. long, longer than the peduncles; 

 Bowers 1 ' •_. lines long; pod with thinnish strongly wrinkled coat. — (M. 

 I >; i rv i flora Desf.) 



Common throughout California. Apr.-May. 



7. TRIFOLIUM L. Clover. 

 By Laura F. McDermott, M. S. 

 Herbs with palmate or short-pinnate leaves; leaflets generally 3, sometimes 

 4 to 7; stipules foliaceous, united at the base and clasping the petioles. 

 Flowers white, pink, yellow, red, or purple, in heads. Heads sometimes loose 

 (umbellate) or spicate. Calyx 5-toothed, sometimes bifid or trifid. Petals 

 united with the stamen-tube or free, persistent and withering. Stamens dia- 

 delphous, 9 stamens united % their length into a tube-like fold, the tenth 

 stamen always free, in a separate whorl or attached to the banner. Pod glo- 

 bose to elongated, 1 to 8 (mostly 1 to 2) -seeded, included within the per- 

 sistent calyx. (Latin tres, three, and folium, leaf.) 



A. Heads involucrate; annuals except no. 5. 

 1. Corolla conspicuously Inflated. 



[nvolucre large, the lobes lanceolate, entire 1. T. fucatum. 



Involucre small, the lobes obtusely rounding or involucre reduced to a ring 



2. T. depauperation. 

 2. Corolla not inflated. 

 Involucre a flat or spreading disc with various-shaped margin. 



Margins of involucre acicularly lobed but not toothed; calyx-teeth dilated, tridentate 

 or simple. 



Plant strictly glabrous 3. T. tridentatum. 



Plant pubescent, fistulous and clammy 4. T. obtusiilorum. 



Margins of involucre lobed, the lobes toothed; calyx-teeth not dilated but subulate. 



Flowers large, each floral whorl subtended by an involucre 



5. T. involucratum. 

 Flowers small, enclosed within 1 or 2 involucres. 



Keel with long rostrate beak 6. T. appendiculotum. 



Keel not long rostrate, but abruptly acute 7. T. laricgatum. 



Margins of involucre lobed, the lobes lanceolate, entire or an occasional lobe divided; 



head and involucre very small 8. T. oliganthum. 



Involucre campanulate to bowl-shaped. 

 Lobes of involucre toothed. 



Calyx-teeth simple, much shorter than the calyx-tube 9. T. microdon. 



Calyx-teeth awn-like, plumose, the middle tooth once or twice forked 



10. T. barbigerum. 



Calyx-teeth characteristically many-forked and glabrous 11. T. cyathifcnim. 



Lobes of involucre entire; calyx-teeth broadly subulate with scarious margins 



12. T. microccphalum. 



B. Heads naked. 



1. Flowers pedicellate, in age reflcxed. 

 Annuals. 



Plant strictly glabrous. 



Calyx-teeth scarious with bristled or ciliated margins; flowers light pink 



13. T. ciliatum. 



Calyx-teeth not scarious, margins entire; flowers a rich rose-red to cream color 



14. T. gracilentum. 



Plants pubescent, (specially the peduncles and calices; leaflets entire or conspicuously 



bifid and spreading; flowers pink 15. T. bifidum. 



ials. 

 riant small; calyx glabrous; flowers cream-color 16. T. repens. 



