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| 1 |
Stipules almost completely adnate to petiole |
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(2) |
| + |
Stipules adnate to petiole for 1/2 its length or less |
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(4) |
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| 2 (1) |
Stem erect; leaflets (3-)5(-9); flowers 20-35, inflorescence capitate. |
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1 T. lupinaster |
| + |
Stem prostrate or decumbent; leaflets 3; flowers 1-5, inflorescence umbellate |
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(3) |
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| 3 (2) |
Stem prostrate, thick and short; leaflets with 6 pairs of lateral veins. |
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2 T. eximium |
| + |
Stem decumbent, thin and long; leaflets with 18-24 pairs of lateral veins. |
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3 T. gordeievii |
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| 4 (1) |
Petioles slender, shorter than or equal to leaflets; flowers less than 8 mm; ovary stipitate |
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(5) |
| + |
Petioles, especially in lower leaves, much longer than leaflets; flowers more than 6 mm; ovary sessile |
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(7) |
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| 5 (4) |
Leaflets all ± sessile; stipules lanceolate, 1-1.5 cm, adnate to petiole for ca. 1/2 their length. |
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6 T. aureum |
| + |
At least terminal leaflet stalked; stipules ovate to oblong, 4-8 mm, adnate to petiole for less than 1/2 their length |
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(6) |
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| 6 (5) |
Flowers 5-15; pedicels larger than or equal to calyx tube; corolla 3-4 mm, standard boat-shaped, acute, smooth; leaflets 5-10 mm. |
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8 T. dubium |
| + |
Flowers 20-40; pedicels smaller than calyx tube; corolla (3-)5-6 mm, standard broadly flattened, emarginate, striate; leaflets 8-16 mm. |
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7 T. campestre |
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| 7 (4) |
Calyx inflated in fruit, veins reticulate, 2 upper teeth longer than 3 lower teeth. |
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9 T. fragiferum |
| + |
Calyx not inflated in fruit, veins not reticulate, teeth subequal or lower longest |
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(8) |
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| 8 (7) |
Flowers pedicellate, bracts present; calyx throat glabrous inside |
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(9) |
| + |
Flowers ± sessile, bracts absent; calyx throat with a thickened hairy ring inside |
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(10) |
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| 9 (8) |
Stem prostrate, stoloniferous, rooting at nodes; stipules thin and membranous; calyx teeth shorter than tube. |
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4 T. repens |
| + |
Stem erect-ascending; stipules herbaceous; calyx teeth longer than or equal to tube. |
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5 T. hybridum |
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| 10 (8) |
Floral heads sessile or very shortly pedunculate, ovoid to globose, involucrate by stipules of upper leaves. |
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12 T. pratense |
| + |
Floral heads pedunculate, subglobose to elongate, involucre of small bracts or none |
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(11) |
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| 11 (10) |
Plants perennial, rhizomatous; stems flexuous; leaf veins arcuate, running into small marginal teeth. |
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11 T. medium |
| + |
Plants annual, lacking rhizomes; stems upright, straight; leaf veins straight |
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(12) |
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| 12 (11) |
Floral heads conic to cylindric, 3-6 cm, involucre absent; calyx teeth ± equal; corolla red or pink, rarely white; stipules broad, apex blunt, dark green to purple. |
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10 T. incarnatum |
| + |
Floral heads ovoid or globose, 1.2-2.5 cm, involucre of small fused bracts; calyx teeth unequal, lower much longer than others; corolla creamy white; stipules narrow, apex attenuate, pale green. |
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13 T. alexandrinum |
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