CL. XVII.] DIADELPHIA DECANDRIA. 297 



longer than the calyx. Seeds from one to four, roundish, 

 smooth. Name from tria, three, and^/b/ta, leaves. 362. 



* Flowers in clusters or spikes. 



1. T. officindle. Common Melilot. Clusters with the flowers 

 pointing one way ; legume protruding, acute, transversely wrin- 

 kled, hairy, two-seeded; stem erect; stipules awl-shaped. 



Stem two or three feet high, erect, branched, angular : leaflets 

 serrate : flowers yellow, in axillar, long- stalked clusters. In dry- 

 ing it emits a strong smell, resembling that of new hay. Culti- 

 vated as food for cattle. Annual : flowers in June and July : 

 grows in thickets, hedges, and borders of fields. Eng. Bot. vol. 

 xix. pi. 1240. Eng, Fl, vol. iii.p. 297. A variety with white flowers 

 has been described as a distinct species. Eng. Bot. Suppl. pi. 2689. 

 Brit. Fl. 4th ed. p. 274. 1068. 



** Flowers In heads ; legumes many-seeded. 



2. T. ornithopodioides. Birds-foot Trefoil. Flowers about three 

 in each head ; legume protruding, eight-seeded, twice as long as 



the calyx ; stems decumbent. Stem from three to five inches 



long : flowers rose-coloured. Annual : flowers in June and July : 

 grows in dry, sandy, or gravelly pastures : not common. Eng. Bot. 

 vol. xv.Spl. 1047. Eng. Fl. vol. iii. p. 298. 1069. 



3. T. repens. White Trefoil. Dutch Clover. Heads of flowers 

 stalked, spherical, the flowers on short stalks ; legume four-seeded, 

 included within the calyx; stems creeping; leaflets inversely 



heart-shaped. Stems from six to twelve inches long: flowers 



white, fragrant : leaflets generally brown on the back. A valuable 

 pasture plant, supposed erroneously to indicate a rich soil. Peren- 

 nial : flowers from May to September : grows in meadows and 

 pastures, abundantly. Eng. Bot. vol. xxv.pl. 1769. Eng. Fl. vol. iii. 

 p. 292. 1070. 



4. T. suffocdtum. Suffocated Trefoil. Heads of flowers sessile, 

 lateral, roundish ; legume two-seeded, concealed within the calyx; 

 teeth of the calyx lance-shaped, acute, recurved, longer than the 



corolla. The whole plant generally buried in sand : flowers 



pale rose-colour. Annual: flowers in June and July: grows on 

 the sandy sea- coast a.t Yarmouth, and other places in England. 

 Eng. Bot. vol. xv. pi. 1049. Eng. Fl. vol. iii. p. 300. 1071. 



*** Flowers in heads ; legumes one-seeded, calyx generally hairy. 



5. T. subterrdneum. Subterraneous Trefoil. Heads of about four 

 flowers, hairy ; central, reflected, stiff, starry tuft of fibres from 



the top of the stalk embracing the fruit. Stems pressed close to 



the ground, from three to six inches long, hairy : flowers white, at 

 first erect, afterwards bent to the ground, the stalk sending out 

 from its extremities several fibres. Annual : flowers in May : 

 grows in dry gravelly pastures in England : frequent. Eng. Bot. 

 vol. xv. pi. 1048. Eng. Fl. vol. iii. p. 300. 1072. 



6. T. ochroleucum. Sulphur-coloured Trefoil. Flowers in a soli- 

 tary terminal head ; stem erect, downy ; lower leaflets inversely 

 heart-shaped ; lowest tooth of the calyx thrice as long as the rest. 

 Stems from twelve to eighteen inches high : flowers pale- 

 yellow. Perennial : flowers in June and July : grows in dry pas- 

 tures, in England : frequent. Eng. Bot. vol. xvii. pi. 1224. Eng. Fl. 

 vol. iii. p. 301. 1073. 



2C 



