Ord. 3-] DIADELPHIA DECANDRIA. 149 



366. TRIFoLIUM. Trefoil, Clover, and Melilot. 



* Flowers in clusters or spikes. Seeds 1 or more. Melilotus. 



1. T. officinale, 19. 1340. (Common Yellow M.) Legumes 2-seeded, 



ovate, wrinkled. Clusters lax. Corolla more than twice as 

 long as the calyx. Petals nearly equal in length. Stem erect. 



Thickets. 0.6,7. Flowers yellow. Plant fragrant when drying. 



*1. T. leucdntha, Melilotus leuc. Suppl. 2629. (White-flowered M.) 



Legumes 2-seeded, ovate, wrinkled. Corolla twice as long as 



the calyx. Keel and wings shorter than the standard. Stem 



erect. 



Fields and waste places, not common. $ . 7, 8. Flowers white, 

 fragrant ; smaller than the last. 



** Flowers capitate. Seeds several. 



2. T. ornithopodioides, 15. 1047. (Bird's- foot T.) Flowers about 



three together. Legume prominent, eight-seeded, twice as 

 long as the calyx. Stems reclining. 

 Barren gravelly past. © . 6, 7- Fl. slender, pale reddish ; keel 

 very small. 



3. T. repens,25. 1769. (White T. Dutch Clover.) Heads globose. 



Flowers somewhat stalked. Legume within the calyx, four- 

 seeded. Stems creeping, solid. 

 Mead, and past. 2£. 5 — 9. L. generally stained. Fl. numer. white. 



4. T. suffocation, 15. 1049. (Suffocated T.) Heads sessile, lateral, 



roundish. Legume concealed, two-seeded. Calyx nearly smooth, 

 with lanceolate, acute, recurved teeth, longer than the corolla. 

 Sandy sea-coasts. . 6, 7. Stems generally buried in the sand. 

 Fl. whitish. 



*** Seeds single. Calyx generally hairy. 



5. T. subterrdneum, 15, 1048. (Subterraneous T.) Heads hairy, of 



about four flowers. Involucrum central, reflexed, rigid, starry, 

 embracing the fruit. 

 Dry, gravelly, and barren situations. 0.5. Depressed. Fl. white. 

 G. T. ochroleucum, 17. 1224. (Sulphur-coloured T.) Flowers in a so- 

 litary, terminal, hairy head. Stem erect, downy. Lower leaflets 

 inversely heart-shaped. Lowest calyx-tooth thrice as long as 

 the rest. 

 Dry past. If. . 6, 7. Stem straight. Fl. pale sulphur. Keel l-pet. 



7. T.pratense, 25. 1770. (Common purple C.) Spikes dense. Stems 



ascending. Petals unequal. Calyx hairy ; four of its teeth equal. 

 Stipulas ovate, bristle-pointed. 

 Mead, and past. if . 5 — 9. Fl. sweet-scented, light purp. ;pet. united. 



8. T. medium, 3. 190. (Zigzag T.) Spikes lax. Stems zigzag and 



branching. Petals nearly equal. Stipulas tapering, converging. 

 Two upper calyx-teeth rather the shortest. 

 Chalkv or gravelly soil. If. 7. Heads rather larger. Pet. purple. 



9. T. mar'itimum, 4. 220. (Teasel-headed T.) Spikes ovate, somewhat 



