Trifolium.] LEGUMINOS^J. 97 



in the calyx. — Distrib. N. temp, regions, rare in S. ; species 150. — Etym. 

 in allusion to the 3 leaflets. 



Section 1. Heads axillary. Fertile flowers few. Calyx enclosing the 

 1 -seeded pod, which at length splits ; its throat naked. Petals caducous. 

 Pods burrowing in the earth when ripening, then covered by the reflexed 

 deformed calyces of the other flowers. 



1. T. subterra'neum, L. ; very hairy, stipules broadly ovate acute, 

 calyx-teeth setaceous as long as the tube, deformed calyces slender with 

 5 rigid palmate lobes. 



Gravelly and sandy pastures, from Chester southd. ; "Wicklow ; Channel Islands ; 

 fl. May-June. — Annual ; covered with spreading soft hairs. Stems |-2 ft., 

 very many, prostrate. Leaflets % in., broadly obcordate. Heads of flowers 

 | in. diam., lengthening after flowering. Flowers cream-coloured (cleisto- 

 gamous occur). Pod orbicular, compressed. Seeds shining — Disteib. From 

 Holland southd., N. Africa, W. Asia, N.W. India. 



Section 2. Heads many-fld., rarely axillary, globose or oblong ; pedicels 

 ebracteate. Calyx not inflated ; throat with a ring of hairs or callous con- 

 striction (obscure in T. Bocconi) ; teeth ciliate, equal or the lower longest. 

 Petals usually persistent. Pod sessile, 1-seeded. 



* Heads cylindric or oblong during or after flowering. 



2. T. arven'se, L. ; softly hairy, leaflets narrow obovate -oblong longer 

 than the petiole, stipules with very long setaceous points, heads terminal 

 peduncled cylindric soft, calyx-teeth persistent longer than the corolla 

 plumose. Hare's-foot Trefoil. 



Dry pastures and fields, from Isla and Ross southd. ; local in Ireland ; Channel 

 Islands; fl. July-Sept. — Annual. Stems many, ascending or snberect. 

 Leaflets f-f in. Heads |-1 in., dense. Floivers minute, white or pale pink . 

 — Distrib. Europe, N. Africa, N. and W. Asia ; introd. in America. 



3. T. Bocco'ni, Savi ; pubescent, leaflets obovate, stipules ovate with 

 setaceous points, heads axillary and terminal cylindric sessile, calyx 

 glabrous teeth straight erect spinescent rather shorter than the petals. 

 Dry places, "W". Cornwall, very rare ; (a native? Wats.); fl. July. — Annual 



Stems 2-4 in. (10-12 in. in cultivation). Leaves shortly petioled ; leaflets 

 a-f in., glabrous above, variable in breadth. Heads J-§ in. Flowers white. 

 Calyx with a very obscure ring in the throat. Pod enclosed in the (not 

 ventricose) calyx.— Distrib. Mediterranean region. 



T. incarna'tum, L. ; pubescent or villous, leaflets broadly obovate 

 or obcordate, stipules obtuse, heads peduncled terminal ovoid or cylindric, 

 calyx hairy teeth, shorter than the corolla spreading in fruit. Crimson 

 Clover. 

 Cultivated in England; Channel Islands; fl. June-July. — .Annual. Very 



variable in size and pubescence. Stems rather slender. Leaves shortly 



petioled ; leaflets f-1^ in. Heads 1-2 in. Flowers § in. Calyx ribs strong. 



— Distrib. S. and "VV. Europe. 



H 



