Trifolium.] 



XXIII. LBGUMINOSAE. 



103 



1. Heads many-flowered, globose or oblong. Calyx with a ring of hairs at the throat, not inflated. 



Petals persistent. Pods sessile, 1-seeded. 



Heads cylindrical or oblong. 



Stipules with long setaceous points . . . . . . . . .. * T. arvense. 



Stipules obtuse . . . . . . . . . . . . . . . . * T. incarnatum. 



Heads ovoid or globose. 



Heads ovoid, sessile. Calyx hairy . . . . . . . . . . . . * T. pratense. 



Heads subglobose. Calyx glabrous ^ . . . . . . . . .. * T. medium. 



Heads sessile. Calyx-tube cylindrical in fruit . . . . . . .. * T. scabrum. 



2. Heads many-flowered. Calyx not inflated ; throat naked. Pods 2-4-seeded. 



Calyx-teeth ovate, acute, reflexed in fruit . . . . . . . . .. * T. glomeratum. 



Calyx oatupauulate. Stems creeping . . . . . . . . . . * T. repens. 



Calyx oampanulate. Stems erect . . . . . . . . . . .. * T. hybridum. 



Calyx 2-lipped, inflated ; throat naked. Pods 1-2- 



* T. resupinatum. 



3. Heads many-flowered. 



seeded, sessile 



4. Heads many-flowered. Flowers ultimately drooping. Calyx not inflated 



throat naked. Corolla persistent. Standard covering the pod. Stems 

 erect 



Heads about 40-flowered 

 Heads 10-12-flowered 

 Heads 3-7-flowered 



* Stems procumbent or ascending, slender. 



* T. agrarium. 



* T. procumbeiis. 



* T. dubium. 



* T.filiforme. 



*T. arvense, L., Sp. PL 769. Annual, erect or spreading, Sin.-lOin. high, 

 very slender, sparingly leafy, silky. Stipules linear-acuminate or setaceous. Leaflets 

 narrow-oblong or linear-obovate. Heads terminal, dense, oblong or cylindrical. 

 Flowers minute. Calyx-teeth equalling or exceeding the petals, silky, plumose. 



NORTH and SOUTH Islands : naturalised in numerous localities, but rarely abundant. 

 Hare's-foot trefoil. Jan. to March. Europe. 



* T. incamatuin, L., Sp. PL 769. Annual, erect, 6in.-18in. high, villous or 

 pubescent, hairs spreading. Stipules ovate, obtuse. Leaflets broadly obovate, retuse 

 or emarginate. Heads terminal, ovate or cylindrical. Calyx hairy ; teeth lanceolate- 

 subulate, nearly equal, shorter than the corolla, patent in fruit. 



NORTH and SOUTH Islands: an occasional escape from cultivation,. scarcely permanent. 

 Crimson clover. Deo. to Feb. South Europe, West Europe. 



-T. pratense, L., Sp. PL 768. Perennial. Stems solid or fistulose, erect or 

 ascending, pubescent, 6in.-18in. high. Stipules ovate, obtuse, abruptly bristle- 

 pointed. Leaflets oblong, elliptic or obovate, entire or retuse, sometimes apiculate. 

 Heads terminal, globular or ovate, dense, sessile, usually subtended by opposite 

 almost sessile leaves. Calyx much shorter than the corolla ; teeth setaceous, hairy, 

 slender, the lowest much the longest. 



N aturalised throughout the colony. Eed clover. Cow-grass. Nov. to Feb. Europe. 



*T. medium, L. ex Euds., FL Ang. ed. i. 284. Stems flexuous, erect or 

 spreading, 6in.-18in. high, pubescent. Stipules lanceolate, acuminate. Leaflets 

 elliptic, oblong or lanceolate, entire apiculate. Heads shortly pedunculate, sub- 

 globose, subtended by opposite leaves. Flowers purple or white. Calyx not half as 

 long as the corolla ; teeth setaceous, hairy, spreading in fruit. Pod dehiscing longi- 

 tudinally. 



NORTH and SOUTH Islands : naturalised in numerous localities. Zig-zag clover. Deoi to 

 Feb. North Europe. 



