138 



LEGUMINACEAE (BEAN FAMILY) 



dehiscent or finally 2-valved. Seeds i to few. — (Gk. mel — honey, lotos = 

 some plant of this family; the flowers are prolific in honey.) 



A. Flowers white. E. — A roadside weed. Good for hay or browse. 



M. alba (sweet clover) 

 AA. Flowers yellow. 

 B. Leaflets obtuse, toothed from near the base; petals 6-g mm. long, E. 



M. officinalis (yellow melilot) 



BB. Leaflets truncate or emarginate, toothed above the middle; petals 2-2.5 mm. 



long. E. M. indica (small melilot) 



TRIFOLIUM (Clover) 



Leaves normally 3-foliolate, in a few species 5-7-foliolate ; stipules 

 adnate to the petiole. Flowers variously colored. Calyx teeth nearly 

 equal. Petal claws adhering to the stamen tube. Stamens diadelphous 

 in groups of 9 and i, or monadelphous by only the partial separation of the 

 I. Seeds 1-6.— (L. tres = 3, folium = a leaf.) All those large enough 

 are good hay or fodder plants. 



A. Leaflets 3-7, but always some leaves with 5-7; heads without involucre. 



B. Leaflets 5-7; flowers 2-3 cm. long. E. 



T. macrocephalum (long-flowered clover) 

 BB. Leaflets 3-5; flowers 6-8 mm. long. E. T. plximmerae 



AA. Leaflets 3. except in occasional abnormal leaves. 



C. Heads not subtended by an involucre. 



D. Heads on terminal peduncles; plants sometimes stemless. 

 E. Leaves glabrous. 

 F. Calyx teeth 3 times as long as the tube, E. T. douglasll 



FF. Calyx teeth scarcely longer than the tube. 

 G. Stem quite evident. 

 H. Stem stout; heads globose; leaflets mostly obtuse; flowers 12-20 mm. 

 long. E. T. beckwithii 



HH. Stem slender; heads oblong; leaflets mostly acuminate; flowers 8-14 

 mm. long. C. E. T. latifolium 



GG. Stemless or nearly so. E. T. haydeni 



EE. Leaves pubescent. '', 



I. Corolla pink or red or purple. 



J. Perennial; calyx lobes not plumose, shorter than the corolla. 

 K. Stems 3-9 dm. high; leaflets 2.5-5 cm. long; flowers purplish red, not 

 reflexed; stipules acuminate. W. C. E. T. pratense (red clover) 



KK. Stems 1.5-2 dm. high; leaflets 1.2-2.5 cm. long; flowers pinkish or light 

 red, at length reflexed; stipules acute. U. T. oreganum 



JJ. Annual; calyx lobes plumose, equaling or exceeding the corolla. 

 L. Leaflets 4-12 mm. long; heads ovate; flowers dark purple. W. 



T. albopurpureum 

 LL. Leaflets 12-25 mm. long; heads oblong; flowers pinkish. W. E. 



T. arvense (rabbit-foot clover) 



II. Corolla yellow or white. 



M. Heads ovoid or oblong; flowers at length reflexed. E. T. plumosum 



MM. Heads obovate. W. C. E. T. longipes 



MMM. Heads globose. 

 N. Calyx teeth plumose. 



