290 DIADKLFHIA DECANDRIA. cL. XVII. 



versely egg-shaped, coming together above, shorter ; keel com- 

 pressed, half-moon shaped, shorter than the wings. Filaments 

 ten, nine united, the uppermost separated, flattish; anthers small, 

 roundish. Germen oblong, compressed. Style triangular, mem- 

 branous at the edges, ascending; stigma longitudinal, downy, 

 united to the upper angle of the keel. Legume large, oblong, 

 somewhat compressed, pointed, one-celled, one-valved. Seeds 

 globular. Name from the Celtic pis, a pea. 352. 



1. P. maritimum. Sea-pea. Leaf-stalks flattish above ; stem angular ; 



stipules arrow-shaped ; stalks many-flowered. Stems procumbent, 



four-cornered : leaves alternate, sessile, alternately pinnate with a 

 branched tendril : Sowers purple, veined with crimson. Perennial : 

 flowers in July : grows on stony beaches in several parts of the eastern 

 and southern shores of England, and in Shetland. Eng.Bot.vol.xv. 

 pi. 1046. Eng. Fl. vol. iii. p. 270. 1036. 



8. O'ROBUS. BITTER-VETCH. 



Calyx superior, cup-shaped, unequal, with five acute segments, 

 the two upper shorter and more distant, the lower one longest. 

 Corolla of five petals ; standard inversely heart-shaped, reflected 

 at the sides, rather longer than the rest; wings inversely egg- 

 shaped, ascending, approaching each other ; keel rounded, 

 pointed, of two united petals, with separate claws. Filaments 

 ten, nine united into a compressed tube, the other hair-like; 

 anthers small, roundish. Germen oblong, compressed. Style 

 thread-shaped, straight, ascending, channelled above ; stigma 

 longitudinal, linear, downy, extending along the upper side of the 

 upper half of the style. Legume oblong or linear, somewhat 

 cylindrical, pointed, ascending at the end, one-celled, two-valved. 

 Seeds several, roundish. Name from oro, to strengthen, and 6ous, 

 an ox. 353. 



1. 0, tuberosus. Heath-pea. Common Bitter-vetch. Leaves pinnate with 

 elliptical leaflets ; stipules half arrow-shaped, toothed at the base ; stem 



erect, simple. Root knobbed, creeping : stems about a foot high : 



flowers in long-stalked, axillar clusters, variegated with blue, purple, 

 and crimson. The root, which is sweetish and astringent, is chewed by 

 the Highlanders. Perennial : flowers in June and July : grows in 

 heaths, and in woods and open pastures : common. Eng. Bot. vol. zvii. 

 pi. 1153. Eng. Fl. vol. iii. p. 272. 1037. 



2. O. niger. Black Bitter-vetch. Leaves pinnate with broadly oblong 

 leaflets ; stipules narrow lance-shaped, acute ; stems branched, erect, 



angular. Root creeping, woody : stems from one to two feet long : 



petals purple, variegated. Whole plant turns black in drying; hence its 

 name. Perennial : flowers in June and July : found by Mr. T. Drum- 

 mond, in the Den of Airly, Forfarshire; and by Dr. Maclachlan, near 

 Moy House, Inverness-shire. Eng. Fl. vol. iii. p. 270. 1038. 



3. 0. sylvdticus. Wood Bitter-vetch. Stems spreading, hairy, branched, 



leaves pinnate, with numerous lance-shaped leaflets. Root creeping, 



woody : stems numerous, from one to two feet long : petals cream- 

 coloured, streaked and tipped with purple. Perennial : flowers in May 



