PEA AND BEAN TRIBE. 143 



Group II. VICIE^;. The Vetch Group. 



Legume not jointed ; stamens in 2 sets, 9 and I ; leaves 

 pinnate, terminating in a tendril or short point. 



13. VICIA (Vetch). Calyx 5-cleft ; style thread-like, 

 or angular, with a small ring of down near the extremity, 

 or a tuft on the under side ; leaves with tendrils. (Name 

 originally derived, according to Theis, from gwig, Celtic ; 

 wicken, in German ; bikion, in Greek ; vesce, in French. 

 Hooker.) 



14. LATHYRUS (Vetchling). Calyx 5-cleft ; style 

 flattened on the upper side, downy beneath the stigma ; 

 leaves with tendrils, except in L. Nissolia. (Name from 

 the Greek lathyros, a plant so called.) 



15. OROBUS (Bitter Vetch). Calyx 5-cleft, swollen at 

 the base, oblique at the mouth, its upper segments deeper 

 and shorter ; style flattened on the upper side, downy 

 on the upper side ; leaves ending in a short point. 

 (Name from the Greek oro, to stimulate, and bous, an 

 ox, from its nutritive properties.) 



Group III. HEDYSARE^E. The Joint- Vetch Group. 



Legume divided into \-seeded joints or cells ; leaves pin- 

 nate, with an odd leaflet* 



* Flowers simple, in umbels. 



16. ORNITHOPUS (Bird's-foot). Legume curved, 

 divided into many equal-sided joints, each of which 

 contains a seed ; keel small, obtuse. (Name from the 

 Greek ornis, a bird, and pous, a foot, to which the tufts 

 of seed-vessels bear a singular resemblance.) 



17. HIPPOCRPIS (Horse-shoe Vetch). Legume com- 

 posed of numerous crescent-shaped joints, so that each 

 legume has many deep notches on one side ; keel nar- 

 rowed into a beak. (Name from the Greek hippos, a 

 horse, and crepis, a shoe, from the form of the joints of 

 the seed-vessels.) 



