294 DIADELPHIA DECANDRIA. 



upper edge ; the other hair-like, separate ; anthers roundish. 

 Germen oblong, compressed. Style cylindrical, ascending at a 

 right angle ; stigma knobbed, all over hairy. Legume oblong, 

 compressed. Seeds from two to four, roundish. Name from the 

 Celtic erw, a ploughed field. 356. 



1. E. hirsutum. Hairy Tare. Clusters many-flowered ; legumes 



hairy, two-seeded ; leaflets abrupt. Stem two or three feet long, 



nearly smooth : flowers whitish or pale-blue. Annual : flowers in 

 June and July: grows in fields and hedges: common. Eng. Bot. 

 vol. xiv. pi. 970. Eng. Fl. vol. iii. p. 289. 1057. 



2. E. tetraspermum. Smooth Tare. Flowers in pairs ; legumes 



smooth, four-seeded; leaflets oblong, bluntish. Stem two or 



three feet long, more or less hairy, as are the leaves ; flowers pale- 

 grey or bluish. Annual : flowers in June and July: grows in fields 

 and hedges: not so common as the last. Eng. Bot. vol. xvii. pi. 

 1223. Eng. Fl. vol. iii. p. 228. 1058. 



12. OKNITHOPUS. BIKD'S-FOOT. 



Calyx inferior, tubular, with five nearly equal, marginal teeth. 

 Corolla of five petals ; standard inversely egg-shaped, entire, 

 ascending ; wings rather smaller, inversely egg-shaped, curved 

 upwards ; keel smaller, of two rounded, united petals, with sepa- 

 rated claws. Filaments ten, nine united into a compressed tube, 

 open along its upper edge, the other hair-like, separate ; all curved 

 upwards at the end ; anthers minute, roundish. Germen linear, 

 compressed. Style slender, ascending ; stigma knobbed, bare. 

 Legume curved, compressed, jointed, finally separating at the 

 joints, each of which contains one roundish seed. Name, from 

 amis, a bird, and pous, a foot. 357. 



1. O.perpusillus. Common Bird* s-foot. Leaves pinnate ; flowers in 



heads ; legumes curved inwards, bead-like. Stems procumbent, 



from three to ten inches long : leaves of numerous pairs of elliptical, 

 hairy leaflets : flowers three or four in each head, which is accom- 

 panied by a pinnate leaf: corolla white, veined with red, the keel 

 greenish. Annual : flowers in May : grows in sandy pastures : 

 frequent. Eng. Bot. vol. vi. pi. 369. Eng. Fl. vol. iii. p. 290. 1059. 



13. ARTHROLO'BIUM. JOINT- VETCH. 



Calyx inferior, tubular, with five teeth. Keel of the corolla 

 very small. Legume nearly cylindrical, smooth, composed of 

 several joints, each containing a single seed. Name from ar- 

 thron, SL joint, and lobos, a pod. 358. 



1. A. ebractedtum. Sand Joint -vetch. Stem thread-like; leaf- stalks 

 two- flowered, nearly equal to the leaves ; stipules very small ; leaves 



pinnated ; leaflets equal, the lower ones remote from the stem. 



A small plant, resembling the preceding in habit. Annual : flowers 

 in July and August : found by Messrs. Babington and Christy in 

 sandy ground in the islands of Guernsey and Jersey. Scilly Islands. 

 Brit. Fl. 4th ed. p. 273. Prim. Fl. Sam. p. 29. 1060. 



