Trifolium campestre |
Trifolium ornithopodioides |
|
---|---|---|
field clover, hop clover, hop trefoil, low hop-clover, pinnate hop clover |
bird clover |
|
Habit | Herbs annual, 5–40 cm, slightly villous or glabrous. | Herbs annual, 5–50 cm, glabrous or glabrescent. |
Stems | erect to ascending, branched. |
procumbent, ascending, or erect, branched. |
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 obovate-lanceolate, 0.5–0.8 cm, margins entire, apex subulate or cuspidate; petiole 4–10 cm; petiolules 0.5 mm; leaflets 3, blades obcordate or obovate, 0.6–1 × 0.4–0.6 cm, base cuneate, veins fine, margins finely serrate, apex truncate or emarginate, surfaces glabrous. |
Inflorescences | axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm; involucres absent. |
axillary, 1–5-flowered, loose, oblong, 0.5–1.2 × 0.1–0.5 cm; involucres absent or bracteoles shallow, cuplike, ± equaling pedicels. |
Peduncles | 1.5–3.5 cm. |
0.5–2 cm. |
Pedicels | reflexed, 0.7–1.2 mm; bracteoles a fringe of red setae. |
straight or slightly reflexed, 1–3 mm; bracteoles lanceolate, 1 mm. |
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. |
5–10 mm; calyx campanulate, 4–4.5 mm, glabrous, veins 10, tube 2.5–3 mm, lobes unequal, triangular, orifice open; corolla pink or white, 5–9 mm, banner oblong, 5–9 × 2–3 mm, apex rounded. |
Legumes | stipitate, oblong, 2–2.5 mm. |
stipitate, ellipsoid-oblong, 6–10 mm. |
Seeds | 1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous. |
4–9, black or dark brown, ellipsoid-globose, 1–1.5 mm, smooth, glossy. |
2n | = 14. |
= 16. |
Trifolium campestre |
Trifolium ornithopodioides |
|
Phenology | Flowering Jun–Aug. | Flowering May–Jun. |
Habitat | Roadsides, fields. | Coastal slopes, roadsides. |
Elevation | 0–1700 m. (0–5600 ft.) | 0–50 m. (0–200 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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NB; Europe; n Africa [Introduced in North America; introduced also in Pacific Islands (New Zealand), Australia] |
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 ornithopodioides comprises small plants and has been considered a member of Trigonella by some authors; molecular studies by N. W. Ellison et al. (2006) showed that it is nested within Trifolium. (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 | Melilotus ornithopodioides, Trigonella ornithopodioides |
Name authority | Schreber in G. F. Hoffmann: Deutschl. Fl. 4: 16, plate 253. (1804) | Linnaeus: Sp. Pl. 2: 766. (1753) — (as M. ornithopodioides) |
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