153 BRITISH BOTANY. 



Sect. I.— Flowers yellow, and becoming scanoiis after flowering (floration) ; 

 throat of calyx naked ; legume stipitate. 



T. filiforme, Lin. — T. minus, Sm. Lesser Yellow Trefoil. — 

 E.B. 1256. L.B.s. 28.2 and 282^. 



A. 18. C. 80. Lat. 50-58°. Alt. 0-200 yds. Tern. 52-46°. 



Roots fibrous, tubercular. Stems spreading-diffuse or ascend- 

 ing, glabrous or slightly pubescent, very slender. Leaflets obo- 

 vate or obcordate, toothed on the upper part, the central leaflet 

 petiolate, the lateral pair sessile ; stipules ovate or ovate-oblong, 

 pointed or tapering to a point. Heads (capitules) lax, 5-20- 

 flowered, on long, filiform peduncles. Standard plicate or keeled, 

 scarcely longer than the wings, not striated or with very fine 

 longitudinal strice. Style much shorter than the fruit. 



In wet, gravelly places. Annual ; May-September. 



Var. ^. pauciflorum? — T. filiforme, Sm. — e.b. 1257. Stems 

 very slender ; heads 2-8-flowered. 



T. procumbens, Lin. Hop Trefoil. — e.b. 945. l.b.s. 281. 

 A. 18. C. 80. Lat. 50-60°. Alt. 0-200 yds. Tein. 52-46°. 



Stems spreading, reclining or ascending, more or less downy, 

 with two deep channels. Leaflets oblong or obovate, usually 

 notched, toothed above, the central leaflet petioled. Stipules 

 acuminate, with setaceous teeth. Heads round, many-flowered, 

 stalked. Flowers sulfur- (sulphur-) coloured, very "numerous, 

 helmet strongly striated, spreading, much longer than the ivings. 

 Style very short. 



Waysides ; dry, sandy places. Annual ; June. 



Sect. II. — Flowers purple, roseate, or white, rarely yellow, in heads or spikes ; 



legume sessile. 

 § 1. Flotoers sessile or nearly so ; calyx hairy or glabrous, with a prominent 



ring, teeth ciliated. 



T. pratense, Lin. Purple Clover. — e.b. 1770. l.b.s. 271. 

 A. 18. C. 82. Lat. 50-61°. Alt. 0-600 yds. Tern. 52-40°. 



Stem angular, hollow, ridged and grooved, pubescent or 

 smooth, leafy. Leaves elliptical, tapering at both ends, more 

 or less hairy, often marked Avith pale-green bands; stipules her- 

 baceo-membranous, awned. Heads sessile, ovate, dense. Calyx- 

 teeth not quite so long as the corolla. (These characters are 

 variable.) 



Pastures ; common ; often cultivated. Perennial ; June-Sep- 

 tember. 



