| Scientific name: | Rhinanthus serotinus (Schönh.) Oborny | |
| Synonym name: | Rhinanthus angustifolius CC Gmel. | |
| Swedish name: | Höskallra | |
| German name: | Großer Klappertopf | |
| Nederlandse naam: | Grote ratelaar | |
| English name: | Greater Yellow-rattle, Late-flowering Yellow Rattle | |
| Family: | Orobanchaceae, Broomrape Family, Snyltrotsväxter |
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| Life form: | Perennial, hemiparasite | |
| Stems: | Height 20-50 cm, erect, branched or unbranched; 4-edged especially in upper part | |
| Leaves: | Opposite, stalkless; densely serrated | |
| Inflorescence: | Flowers borne in spike-like groups, terminating stem and branches | |
| Flowers: | Irregular corolla (zygomorphic), long, pale yellow, fused, bilabiate, long and arched tube; upper lip hooked, flat-sided, tip with 2 purple, tapered teeth; lower lip 3-lobed; calyx 4-lobed, oval, wide, lime green; stamens 4 | |
| Flowering Period: | June, July, August, September | |
| Fruits: | Capsule, flat, brown | |
| Habitat: | Roadsides, meadows, pastures | |
| Distribution: | Quite common in Skåne - Jämtland |
 Derivation of the botanical name: Rhinanthus, rhin for "snout" and anthos for flower. serotinus, late in flowering or ripening. angustifolius,narrow-leaved.
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