606 FABACEAE 
subulate-lanceolate, the longer ones exceeding the tube in length : corolla yellow, 3-4 mm. 
long ; standard with a suborbicular blade, surpassing the wing-petals. 
In fields and waste places, throughout the United States and southern British America. Natural- 
ized from Europe. Spring to fall. 
3. Trifolium agrarium L. Foliage bright green. Stems more or less diffusely branched, 
often from the base, the branches 2-8 dm. long, ascending or reclining, strigillose: leaves 
numerous , petioles shorter than the leaflets on the upper part of the branches; stipules 
somewhat acuminate: leaflets 3, the blades broadest above the middle, the terminal one no 
longer-stalked than the lateral, all denticulate: peduncles becoming 1-5 cm. long, finely 
pubescent : racemes oblong or oval, 12-20 mm. long, densely many-flowered : calyx 3.5-4 
mm. long, short-pedicelled ; lobes linear-subulate, longer than the ribbed tube: corolla 
deep yellow, 4-5 mm. long, becoming reflexed, turning brown in age. 
In fields and waste places, Nova Scotia to Ontario, lowa and Georgia. Naturalized from Europe. 
Spring and summer. 
4. Trifolium arvénse L. Annual, villous-lanuginose. Stems erect, 1-4 dm. tall, 
usually branched throughout: leaflets 3, the blades linear to oblanceolate, 1-2.5 cm. long, 
notched or truncate at the apex, often mucronate, entire or slightly two-toothed : peduncles 
surpassing the subtending leaves: heads dense, oblong or cylindric, 1-3 cm. long: calyx 
gray ; tube finally ovoid ; lobes subulate, longer than the tube: corolla whitish, surpassed 
by the calyx lobes: standard somewhat longer than the wing-petals. 
Along roadsides, in dry fields and on banks, throughout eastern North America. Naturalized from 
Europe and Asia. Summer. 
5. Trifolium pratémse L. Perennial, more or less densely pubescent. Stems com- 
monly branched at the base, the branches erect or ascending, 2-7 dm. long : leaflets 3, the 
blades oblong, elliptic or oval, varying to ovate or obovate, 1-4 cm. long, rounded or 
notched at the apex, sometimes apiculate, denticulate, often blotched : peduncles commonly 
shorter than the subtending leaves: heads subglobose to ovoid, 2.5-3 em. thick: calyx 
villous; tube long-campanulate ; lobes filiform, the longer ones often surpassing the 
tube: corolla red, purple or white, nearly 1.5 cm. long; standard elongated, surpassing 
the wing-petals. 
In fields, meadows and cultivated grounds, throughout the United States and southern British 
America. Widely cultivated and naturalized from Europe. Spring to fall. 
6. Trifolium refléxum L. Annual or biennial, more or less densely villous or downy, 
destitute of runners. Stems simple and erect or usually branched at the base, the branches 
ascending or spreading, 1-5 dm. long: leaflets 3, the blades oblong, elliptic-obovate to 
suborbicular, 1.5-3 cm. long, rounded or emarginate at the apex, often mucronate, dentic- 
ulate: peduncles longer or shorter than the subtending leaves: calyx often glabrous; 
tube campanulate, very short; lobes lanceolate-subulate, much longer than the tube: 
ee 6-10 mm, long; standard red or purple, surpassing the white keel and wing- 
petals. 
In waste places, fields, dry woods and meadows, Ontario to Nebraska, Florida and Texas. Spring. 
7. Trifolium stoloníferum Muhl. Perennial, glabrous, producing runners at the 
base. Stems simple and erect or branched at the base, the branches widely spreading, 17 
dm. long: leaflets 3, the blades obovate, broadly cuneate or nearly orbicular, 1-3 cm. in 
diameter, rounded or notched at the apex, denticulate : peduncles surpassing the subtend- 
ing leaves: calyx ribbed; tube campanulate ; lobes subulate, twice or thrice as long as the 
tube: corolla white tinged with purple, 8-12 mm. long; standard involutely folded, sur- 
passing the wing-petals. 
In open woods and on prairies, Ohio to Nebraska, Tennessee and Missouri. Spring and summer. 
8. Trifolium Bejariénse Moric. Annual, sparingly pubescent. Stems erect, OF 
branched at the base, the branches ascending or decumbent, 1-2 dm. long, simple or 
branching above: leaflets 3, the blades obovate or cuneate, 5-10 mm. long, sounded €. 
emarginate at the apex, denticulate : peduncles several times longer than the subtending 
leaves : heads many-flowered, 1.5-2 cm. thick : calyx reticulated, 2-lipped ; tube camp PE 
late ; lobes unequal, the upper one nearly distinct, the rest shorter than the tube: pr d 
pale, becoming brown, somewhat longer than the calyx ; standard and wing-petals toothed, 
the former surpassing the latter. 
On prairies, Texas. Spring. 1 
9. Trifolium Carolinianum Michx. Perennial, slender, pubescent. Stems umiy 
branched at the base, the branches ascending or decumbent, 1-3 dm. long, often sparingy 
branched above: leaves with slender petioles: leaflets 3, the blades obovate or cuneate, 
5-12 mm. long, rounded or emarginate at the apex, denticulate, acute at the - pers 
duncles usually many times longer than the subtending leaves: calyx pilose, reticulate” » 
