TRIFOLIUM.] LWUMINOSM. 97 



in the calyx. DISTRIB. K 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, whi^h 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 f overs 

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

 gamous occur). Pod orbicular, compressed. Seeds shining. DISTRIB. 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 cr 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 ^-J in. Heads ^-1 in., dense. Flowers minute, white or pale pink. 

 DISTRIB. Europe, N. Africa, N. and "W. Asia ; introd. in America. 



3. T. Bocco'ni, Sam ; 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 

 3-f in., glabrous above, variable in breadth. Heads |-| 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-H in. Heads 1-2 in. Flowers f in. Calyx ribs strong. 



DISTRIB. S. and "W". Europe. 



II 



