Trifolium campestre |
Trifolium barnebyi |
|
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field clover, hop clover, hop trefoil, low hop-clover, pinnate hop clover |
Barneby's clover |
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Habit | Herbs annual, 5–40 cm, slightly villous or glabrous. | Herbs perennial, 3–5 cm, mostly glabrous. |
Stems | erect to ascending, branched. |
densely mat-forming, short-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 ovate or lanceolate, 0.5–1 cm, margins entire or lobed, apex acute or acuminate; petiole 0.3–30 cm, pubescent; petiolules 0.2 mm; leaflets 3, blades oblanceolate, 0.3–1.6 × 0.1–0.7 cm, base cuneate, veins close-set, 12–18 pairs of primary veins, 0.5 mm apart, margins sharply antrorsely serrate, apex acute, long-apiculate, surfaces usually glabrous, rarely midvein pubescent abaxially. |
Inflorescences | axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm; involucres absent. |
terminal, 8–18-flowered, globose or subglobose, 1.2–2.5 × 2–3 cm; involucres absent. |
Peduncles | 1.5–3.5 cm. |
0.5–3.5 cm, pubescent. |
Pedicels | reflexed, 0.7–1.2 mm; bracteoles a fringe of red setae. |
reflexed, 2–3.5 mm, pubescent; bracteoles broad, membranous, to 0.2 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. |
8–13 mm; calyx campanulate, 4–6 mm, pubescent, veins 5–10, tube 1.5–2.5 mm, lobes subequal, narrowly triangular-subulate, orifice open; corolla creamy white, 8–13 mm, banner broadly elliptic-oblong, 10–13 × 6–8 mm, apex rounded, slightly apiculate. |
Legumes | stipitate, oblong, 2–2.5 mm. |
stipitate, flattened, ovoid, 2–3.5 mm. |
Seeds | 1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous. |
1, yellow, mottled, flattened-ovoid, 2 mm, smooth. |
2n | = 14. |
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Trifolium campestre |
Trifolium barnebyi |
|
Phenology | Flowering Jun–Aug. | Flowering Jun. |
Habitat | Roadsides, fields. | Sandstone ledges and outcrops. |
Elevation | 0–1700 m. (0–5600 ft.) | 1700–2100 m. (5600–6900 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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WY |
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 barnebyi is known from central Wyoming. It was originally described as a variety of T. haydenii, but was elevated to species rank based on its pubescent petioles, pedicels, and peduncles, closely spaced leaflet veins, and more elongate leaflets that are two times as long as wide. (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 | T. haydenii var. barnebyi |
Name authority | Schreber in G. F. Hoffmann: Deutschl. Fl. 4: 16, plate 253. (1804) | (Isely) Dorn & Lichvar: Madroño 28: 189. (1981) |
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