36 ENGLISH BOTANY. 
Flowers whitish, rose-colour, purple, or yellow, in heads or compact. 
spikes, which are axillary or terminal and generally many-flowered. 
The name of this genus at once expresses its peculiarity, coming from tres, the 
Latin word for three, and /folium, a leaf; all the species having trifoliate or three- 
parted leaves. The Greeks call it rpigvAXov ; the French, tréfle ; and the English, trefoil 
or clover. 
Section I.—TRICOCEPHALUM. Xoch. 
Heads axillary, with few fertile flowers, burying themselves 
in the earth after flowering. Corolla caducous. Calyx without a 
callous or hairy ring at the mouth of the throat; fructiferous 
calyces dilated by the pods, covered by the sterile calyces, which 
are produced after flowering, and reflexed over the fertile ones 
so as to look almost like an involucre situated at the apex of the 
head instead of at its base. Pod sessile, enclosed in the tube of the 
calyx, 1-seeded. 
SPECIES I—TRIFOLIUM SUBTERRANEUM. Zina. 
Puate CCCXLVI. 
Annual, pubescent. Leaflets obcordate, nearly entire except 
at the apex. Stipules adnate for half their length, ovate-acute. 
Flower-heads stalked. Fertile flowers 2 to 5. Calyx-teeth setaceous, 
as long as the tube. Corolla longer than the calyx. Upper flowers 
numerous, barren, produced after the fertile ones, reduced to abor- 
tive calyces, with the tube filiform, rigid, terminated by 5 points or 
teeth, reflexed over the fertile calyces around which they form a 
coma. Fructiferous calyx ovoid, ruptured by the pod, marcescent. 
Among short herbage on pastures in sandy and gravelly places, 
not unfrequent in the South of England, extending as far North as 
Lancashire, Nottinghamshire, and Norfolk. 
England. Annual. Early Summer. 
Stems numerous, simple or slightly branched, prostrate, 2 to 18 
inches long. Leaves on long petioles, digitately trifoliate; leaflets 
+ to ? inch long, inversely deltoid, obcordate, finely denticulated 
at the apical margin. Stipules very large, half-ovate, acute, ad- 
nate to the petiole for half their length. Peduncles varying in 
length from 1 to 3 or 4 inches, hooked at the apex in fruit. 
Fertile “flowers generally 2 or 8, subsessile, 3 inch long, white 
tinged with cream-colour, at first erect, afterwards spreading. 
Flowering calyx with a eylindrical oe ae 5 subulate-filiform 
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