Trifolium patens Schreb.
1797 (14). T. patens Schreb. in Sturm, Deutschl. Fl. I (4) (1804) 16; Hayek, Prodr. Fl. Penins. Balc. I (1926) 849; Стоян., Сборн. БАН 26 (1930) 40; Coombe, Fl. Eur. II (1968) 166—Жълта детелина
Fam: Leguminosae Juss. (Fabaceae)
Genus: Trifolium L.
Species: Trifolium patens Schreb.
English Name: Trefle etale
Annual plants. Stems single to many, (10.0) 15.0 - 30.0 (40.0) cm long, thin, curved wave, ascending or erect, branched, rarely simple, sparsely short-fitting or semi outspread, fiber. Stipule ovoid to lance ovoid, entire, more or less long pointed, rounded at the base, glabrous, tunicates, with more or less clear streaks, the upper level of the bottom with tabs, 2 - 4 times shorter than the leaf stems. Leaves consecutive scattered fitting fiber, lower with slightly longer stems. Leaflets (6.0) 10.0 - 15.0 (19.0) mm long and (3.0) 4.0 - 6.0 (8.0) mm wide, wedge back ovoid or elliptical closely back ovate, with 15 - 20 stripped to 1/2 of its shallow, serrated edge, a top shallow concave or entire, naked or veins fitting fibrous, the middle of more or less developed stems or rarely almost seated and side. The stems of the inflorescences scattered fibrous or naked, little longer than the in inflorescence leaves. Heads 10.0 - 15.0 mm diameter, spherical to ovoid and loose. Bracts short, red, glandular or missing. Blossom stems 0.5 - 1.0 mm long, 2 - 4 times shorter than the tube of the calyx or blossoms almost seated. Blossoms 30 - 40, 5.5 - 7.0 (7.5) mm long. Calyx 2.5 - 3.5 mm long, nude; tube with 5 obscure veins; throat freely; upper teeth of the calyx shorter than the upper tube of the lip, lower teeth of the calyx equal to lower lip of the tube or longer; a time longer than the above, all styliform lancet, naked or in the upper part a few hairs. Corolla golden yellow, after overblown not changed, 1 - 1.5 times longer than the calyx. Flag streaked, with extended back ovoid leaf blade, 1/3 longer than the wings and keel. Wings with elliptical leaf blades equal to the length of the wedge shaped claw, tongue to 2 times shorter than the nail. Keel equal to the wings, with narrow elliptical, a little longer than the nail leaf blade, with clearly developed tongue without outgrowth of its peak. Beans ovoid, 1 - 2-seed, slightly longer than the calyx, with a short stalk him.
Flowering Time: Blooms: V - VII, fruitful: VII - IX.
References: „Флора на НР България”, том VI, БАН, София, (1976)
Distribution in Bulgaria: Grow in dry and moderately humid grassy places in meadows, in lowlands, foothills and lower mountain belt. Widespread in all appropriate floristic regions up to 2200 m altitude. (Conspectus of the Bulgarian Vascular Flora) = conspectus&gs_l= Zlc.
Distribution: Central and Southern Europe, Mediterranean, Southwest Asia (Western Syria).
Conservation status and threats: not protected species in Bulgaria by the Biodiversity Law. - Biological Diversity Act - http://eea.government.bg/bg/legislation/biodiversity/zbran_22.08.15.pdf
Medical plant: it is not. Medicinal Plants Act - http://eea.government.bg/bg/legislation/biodiversity/ZLR_en.pdf
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