Burke: Trifolium campestre

	Trifolium campestre
	field clover, hop clover
Habit	Pubescent to glabrous annual, with usually several procumbent to ascending stems 1-3 dm. tall.
Leaves	Leaves trifoliate, the petioles considerable longer than the stipules; leaflets oblong-elliptic to oblanceolate, 1-3 cm. long, serrulate 2/3 their length; petiole of the terminal leaflet at least twice as long as those of the lateral leaflets; stipules ovate, 4-9 mm. long, attached to the petiole over half their length, the free tip about the same length as the width of the attached portion.
Flowers	Inflorescence of 30- to 100-flowered heads, up to 12 mm. thick, on axillary peduncles longer than the leaves; flowers 4-6 mm. long, yellow, pea-like; calyx glabrous, half the length of the corolla, the upper 2 teeth about half as long as the lower 3, the latter slightly longer than the calyx tube; banner flared and spreading, much longer than the wings and keel.
Fruits	Pod 1- or 2-seeded, much longer than the attached style.

	Trifolium campestre
Flowering time	May-August
Habitat	Wastelots, roadsides, fields, meadows, and other disturbed areas.
Distribution	Occurring chiefly west of the Cascades in Washington; Alaska to California, east across most of North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Europe
Conservation status	Not of concern
Sibling taxa	T. albopurpureum, T. arvense, T. aureum, T. bifidum, T. cernuum, T. ciliolatum, T. cyathiferum, T. depauperatum, T. dichotomum, T. douglasii, T. dubium, T. eriocephalum, T. fragiferum, T. glomeratum, T. gracilentum, T. hirtum, T. hybridum, T. incarnatum, T. latifolium, T. longipes, T. macrocephalum, T. microcephalum, T. microdon, T. oliganthum, T. plumosum, T. pratense, T. repens, T. resupinatum, T. retusum, T. striatum, T. subterraneum, T. suffocatum, T. thompsonii, T. variegatum, T. vesiculosum, T. willdenovii, T. wormskioldii
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Trifolium campestre

field clover, hop clover

Habit

Pubescent to glabrous annual, with usually several procumbent to ascending stems 1-3 dm. tall.

Leaves

Leaves trifoliate, the petioles considerable longer than the stipules;

leaflets oblong-elliptic to oblanceolate, 1-3 cm. long, serrulate 2/3 their length;

petiole of the terminal leaflet at least twice as long as those of the lateral leaflets;

stipules ovate, 4-9 mm. long, attached to the petiole over half their length, the free tip about the same length as the width of the attached portion.

Flowers

Inflorescence of 30- to 100-flowered heads, up to 12 mm. thick, on axillary peduncles longer than the leaves;

flowers 4-6 mm. long, yellow, pea-like;

calyx glabrous, half the length of the corolla, the upper 2 teeth about half as long as the lower 3, the latter slightly longer than the calyx tube;

banner flared and spreading, much longer than the wings and keel.

Fruits

Pod 1- or 2-seeded, much longer than the attached style.