Trifolium campestre |
Trifolium fragiferum |
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field clover, hop clover, hop trefoil, low hop-clover, pinnate hop clover |
strawberry clover |
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Habit | Herbs annual, 5–40 cm, slightly villous or glabrous. | Herbs perennial, 5–50 cm, pubescent or glabrous. |
Stems | erect to ascending, branched. |
prostrate or creeping, branched, rooting at nodes. |
Leaves | pinnate; stipules ovate-lanceolate, 0.5–0.8 cm, margins entire, glandular, apex acuminate; petiole 0.3–2 cm; lateral leaflet petiolules 0.5–0.6 mm, terminal leaflet stalk 3–5 mm; leaflets 3, blades rhombic to obovate, 0.4–1.5 × 0.4–0.8 cm, base cuneate, lateral veins prominent, ± parallel, ascending, margins denticulate distally, apex truncate or retuse, surfaces strigose adaxially. |
palmate; stipules linear or lanceolate, dilated proximally, 1.3–2 cm, margins entire, apex subulate or acuminate; petiole 1–9 cm; petiolules 1 mm; leaflets 3, blades ovate, obovate, or elliptic, 0.5–3 × 0.3–1.5 cm, base cuneate, veins prominent, thickened, curved, margins spinulose-denticulate, apex obtuse, often retuse, surfaces hairy abaxially, glabrous adaxially. |
Inflorescences | axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm; involucres absent. |
axillary, erect or ascending, 10–30-flowered, globose, 0.8–2 × 0.8–2 cm; involucres cup-shaped, composed of bracteoles, bracteoles lanceolate-oblong, 3–6 mm, distinct or connate proximally. |
Peduncles | 1.5–3.5 cm. |
3–17 cm. |
Pedicels | reflexed, 0.7–1.2 mm; bracteoles a fringe of red setae. |
straight, to 0.5 mm; bracteoles linear or lanceolate, 2–3 mm, acuminate or 2-fid. |
Flowers | 4.3–5 mm; calyx campanulate, strongly bilabiate, 1.3–1.5 mm, glabrous, veins 5, tube 0.3–0.6 mm, lobes unequal, adaxial deltate, very short, lateral and abaxial linear-subulate, each tipped with 1 or 2 stiff hairs, orifice open; corolla yellow becoming brown, 3.5–6 mm, ribbed, banner persistent, obovate, enveloping other petals, boat-shaped, 4.3–5 × 2.8–3.2 mm, apex broad, acute. |
6–8 mm; calyx tubular, inflated in fruit, markedly asymmetric-bilabiate, 2.5–7 mm, usually pilose to woolly, sometimes glabrescent, veins 5–10, connected by reticulating lateral veins, tube 2–7 mm, lobes unequal, abaxial equal to or longer than tube, straight, adaxial spreading in fruit, shorter than tube, very unequal in fruit, orifice open; corolla white to pink, 5–8 mm, banner oblong-lancelate, 5–8 × 2 mm, apex emarginate to crenulate. |
Legumes | stipitate, oblong, 2–2.5 mm. |
ovoid, 2.5–3 mm, long-beaked. |
Seeds | 1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous. |
1 or 2, tan or brown-spotted, globose-reniform, 1–1.4 mm, smooth, dull. |
2n | = 14. |
= 16. |
Trifolium campestre |
Trifolium fragiferum |
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Phenology | Flowering Jun–Aug. | Flowering Apr–Nov. |
Habitat | Roadsides, fields. | Meadows, fields, roadsides, sandy and saline soils. |
Elevation | 0–1700 m. (0–5600 ft.) | 0–2000 m. (0–6600 ft.) |
Distribution |
AK; AL; AR; AZ; CA; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; VT; WA; WI; WV; WY; BC; NB; NF; NS; ON; PE; QC; SPM; Europe; w Asia; n Africa [Introduced in North America; introduced also in South America, e Asia (China), s Africa, Pacific Islands (Hawaii, New Zealand), Australia]
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AZ; CA; CO; GA; IA; ID; IL; KS; MA; MN; MT; ND; NE; NJ; NM; NV; NY; OH; OR; PA; SD; UT; WA; WI; WY; BC; ON; c Europe; s Europe; w Asia [Introduced in North America; introduced also in s South America, Pacific Islands (New Zealand), Australia]
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Discussion | Trifolium filiforme Linnaeus and T. procumbens Linnaeus are rejected names that were used historically for T. campestre (J. E. Dandy 1958; N. J. Turland et al. 1996). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium fragiferum is cultivated for pastures and in mixtures with grass for hay and silage and, to a lesser extent, as groundcover in orchards and vineyards and as a green manure cover crop (L. St. John et al. 2010). It appears to have been introduced accidentally in the 1870s and as a crop around 1900 (E. A. Hollowell 1939). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Synonyms | Chrysaspis campestris | Amoria bonannii, T. bonannii, T. fragiferum subsp. bonannii |
Name authority | Schreber in G. F. Hoffmann: Deutschl. Fl. 4: 16, plate 253. (1804) | Linnaeus: Sp. Pl. 2: 772. (1753) |
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