44 



16. LEGUMINOS^. 



— Most of the year. — South America, where it is commonly 

 known by its Indian name of Aguariho]!. "It secretes a 

 peculiar resin of stiong and ai^reeablo odour, which is known 

 in Europe by the name of AmciUnn mastic, and is employed 

 as a purgative. The bark and leaves are used as a remedy 

 for ulcers and wounds, and the leaves yield a yellow dye." 

 — Arechavaleta, FJ. TJn((niaiia, 295. 



Cl.\ss 2.— CALYCIFLOR.^. 



Flowers with 2 floral envelopes (calyx and corolla) ; 

 petals distinct, inserted, as are also the stamens, upon the 

 calyx, which is sometimes free and sometimes adherent to 

 the ovary. 



Family 16.— LEGUMINOS>E. 



Subfamily 1. — PAPiLiON.\ciiJ.. 



Flowers irregular ; calyx of 5 divisions and often 2-lipped ; 

 corolla supposed to resemble a butterfly ( papiUo), consisting 

 of 5 unequal petals, the upper one (stiindard ) the largest 

 and placed outside the others in bud, the two lateral ones 

 (iriiigs) equal, and the 2 lower ones usually united by the 

 outer edge in a keel; stamens 10, either all united in a tube 

 round the ovary, or 9 united in a tube split on the inner 

 side and 1 free, or all free (in some Australian genera) ; 

 style and stigma 1; fruit a pod (lequinrn) with 1 cell and 

 2 valves. 



A. Leaves simple or of 3 leaflets. 



B. Stamens all united in a tube; shrubs. 

 Calyx with 1 or 2 lips slit to the base; 

 leaves simple. 



Calyx 2-lipped; pod short Ulex 1 



Calyx 1-lipped; pod long Si'AKTIUM 2 



Calyx with 2 lips not slit to the base; 



leaves simple or of 3 leaflets Cytisus 3 



B. Stamens 9 united, 1 free; leaflets 3: 



herbs. 

 Stipules leaflike, free ; pod usually Iring Lotus 

 Stipules not leafy, adherent to petiole. 

 Pod enclosed in the calyx ; flowers 



usually in heads Trifolium 4 



Pod exceeding' the calyx ; flowers 

 lisually in racemes or umbels. 

 Flowers in long racemes ; pod short, 



straight. 1-2-seeded Melilotus 5 



Flowers in short racemes or umbels ; 

 pod spirally twisted, with several 



seeds ../ Medicago 6 



A. Leaves pinnate or digitate ; style curved 

 upwards. 



C. Leaves even-pinnate, ending in a ten- 



dril ; stamens united or upper one 

 free. 



