LEGUMINOS.^ 83 



C. minima, L. (PI. 29); leaflets in 3-4 pairs, stipules 

 very small, persistent, plant prostrate, glabrous, 4-8 in. 

 high ; rare ; Southern Switzerland, Jura, P}^renees. 



20. ORNITHOPUS, L. 



Flowers very small, in long -stalked umbels; leaves 

 pinnate, with a terminal leaflet ; legume slender, curved, 

 many-jointed ; small prostrate herbs. Not alpine. 



0. perpusillus, L., Bird's-foot Trefoil ; flowers white, 

 bracts pinnate ; sandy fields ; very rare in Switzerland. 



21. HlPPOCREPIS, L. 



Flowers in long-stalked umbels, drooping ; petals with 

 a long claw; stipules small or o; legume curved, with 

 3-6 horseshoe-shaped i -seeded joints. Not alpine. 



H. comosa, L., Horseshoe Vetch ; flowers yellow, 

 leaflets in 4-8 pairs; dry banks, common, especially 

 calcareous. 



22. ONOBRYCHIS, L. 



Flowers in axillary spikes or racemes; wings short; 

 keel obliquely truncate; leaves pinnate, with a terminal 

 leaflet ; legume compressed, not jointed, often spiny. 



O. sativa, Lam. (vicicefolia, Scop.), Sainfoin; flowers 

 pink, striped with red, raceme long-stalked, leaves in 

 6-12 pairs, stem prostrate; sandy hills. O. montana, 

 DC. ; flowers smaller, pink or purple, leaflets shorter and 

 broader; alpine pastures; Alps, Jura, Dauphiny, Pyre- 

 nees. O. supina, DC. (arenaria, DC.) ; flowers small, 

 white streaked with red, legume pubescent, spiny, stem 

 prostrate ; sandy hills ; Western Switzerland, Pyrenees. 



