138 LEGUMINACEAE (BEAN FAMILY) 



dehiscent or finally 2-valved. Seeds i to few. (Gk. met = 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 6-9 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 s-y-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. plummerae 



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. douglasii 



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. beckwithil 



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) 

 n. 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. 



