Trifolium campestre |
Trifolium rollinsii |
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field clover, hop clover, hop trefoil, low hop-clover, pinnate hop clover |
Rollins' clover |
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Habit | Herbs annual, 5–40 cm, slightly villous or glabrous. | Herbs perennial, 5–20 cm, glabrous. |
Stems | erect to ascending, branched. |
ascending, cespitose, 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. |
mostly basal, palmate; stipules ovate, 1 cm, margins entire, apex blunt; petiole 2–6 cm; petiolules to 1 mm; leaflets 3, blades obovate or rhombic, 0.6–1.3 × 0.6–1 cm, base cuneate, veins prominent, margins denticulate, apex rounded or retuse, apiculate, surfaces pale abaxially, glabrous. |
Inflorescences | axillary, 30–60-flowered, globose or broadly ovoid, 0.8–1.5 × 0.7–1 cm; involucres absent. |
terminal or axillary, 8–15-flowered, appearing turned to one side, obconic, 1.3–1.8 × 1.1–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
Peduncles | 1.5–3.5 cm. |
curved distally proximal to flowers, 3–9 cm. |
Pedicels | reflexed, 0.7–1.2 mm; bracteoles a fringe of red setae. |
reflexed, 1–1.2 mm; bracteoles minute. |
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. |
10–13 mm; calyx purple, campanulate, 5–6 mm, glabrous, veins 10, tube 3.5 mm, lobes equal, subulate, 2 mm, orifice open; corolla purple, often with white tips, 15 mm, banner obovate, 11–13 × 5–6 mm, apex flared. |
Legumes | stipitate, oblong, 2–2.5 mm. |
not seen. |
Seeds | 1 or 2, yellow, ellipsoid, 1–1.5 mm, smooth, lustrous. |
not seen. |
2n | = 14. |
|
Trifolium campestre |
Trifolium rollinsii |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Roadsides, fields. | Wind-swept alpine areas. |
Elevation | 0–1700 m. (0–5600 ft.) | 3000–3100 m. (9800–10200 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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NV |
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 rollinsii is known from the Toiyabe Range in Lander and Nye counties in central Nevada. (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. kingii subsp. rollinsii, T. macilentum var. rollinsii |
Name authority | Schreber in G. F. Hoffmann: Deutschl. Fl. 4: 16, plate 253. (1804) | J. M. Gillett: Madroño 21: 453, fig. 2. (1972) |
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