CLASS XVII. ORDER III. ] TRIFOLIUM. 975 
during the winter, for which purpose it is well suited, as it retains its 
elegant form and appearance after being dried, and when mixed with 
some of the more elegant forms of grasses, forms a permanent and 
beautiful decoration, until the fresh flowers of spring appear. 
7. T sca'brum, Linn. (Fig. 1128.) Rough Rigid Trefoil. Heads 
ovate, lateral and terminal, with an involucre at the base; calyx 
rigid, downy, ten ribbed, its teeth unequal, lanceolate, rigid, single 
ribbed, at length recurved, its mouth closed; leaves oblong, wedge- 
shaped, toothed, the veins on the margin arched and prominent; 
stipules ovate, acute ; stem procumbent. 
English Botany, t. 903.—English Flora, vol. iii. p. 306.—Hooker, 
British Flora, ed. 4. vol. i. p. 276.—Lindley, Synopsis, p 80. 
foot tapering. Stems several, from three to nine inches long, pro- 
cumbent, branched at the base, and spreading, round, or somewhat 
angular, rigid, hairy. Leaves petiolated, downy, leaflets oblong, 
wedge-shaped, with a prominent mid-rib and lateral veins, arched 
near the margin, unequally toothed. Stipules membranous, ovate, 
acute, ribbed and downy. Inflorescence ovate heads of crowded 
flowers, terminal, and in the axis of the upper leaves the base 
enveloped in an inyolucre. Calyx cylindrical, in fruit downy, ten 
ribbed, and furrowed, the teeth unequal, rigid, lanceolate, acute, erect 
in flower, spreading, and recurved in fruit. Corolla small, incon- 
spicuous. Legume membranous, single seeded. 
Habitat.—Dry chalky or sandy fields in various parts of England; 
Anglesea, near Edinburgh, and Dunbar, Scotland; near Sandymount, 
and at Kilbarrick Church, Ireland. 
Annual; flowering in May and June. 
8. TZ. stria'tum, Linn. (Fig. 1129.) Soft Knotted Trefoil. Heads 
ovate, becoming cylindrical, terminal and lateral, with an involucre 
at the base; calyx hairy, its tube ten ribbed, becoming tumid, the 
teeth unequal, lanceolate, bristle-shaped, the mouth clossd with a 
cartilaginous ring; leaves oblong, wedge-shaped, serrated, the veins 
equal and straight at the margin; stipules ovate, acute; stems 
ascending. 
English Botany, t 1843.—English Flora, vol. i. p. 307.—Hooker, 
British Flora, ed. 4. vol. i. p. 276 —Lindley, Synopsis, p. 80. 
foot slender, tapering. Stems numerous, procumbent, of various 
lengths, round, branched, downy. eaves numerous, the lower on 
long footstalks, the upper on short ones, downy, leaflets obovate, 
finely toothed and downy, the mid-rib prominent, and the lateral ones 
straight, parallel, the leaflets of the lower leaves often heart-shaped. 
Stipules broadly ovate, pointed, membranous, striated, with coloured 
veins, downy.- Inflorescence small ovate heads, becoming cylindrical, 
terminal and lateral, all with an involucre at the base. Calyx hairy, 
its tube cylindrical, ten ribbed, and deeply furrowed, becoming after 
flowering swollen and tumid, the teeth unequal, awl-shaped, rigid, 
