Scientific name: Trifolium campestre Schreb.
Common name: Hop Trefoil
Description
Habit: A sparsely hairy annual, to 40 cm high.
Stems: Semi-erect.
Leaves: Alternate, pinnate, usually with 3 leaflets; leaflets stalkless, middle one stalked, oval, 10 mm long.
Flowers: Yellow, zygomorphic, 5 mm across, in globular, compact flower-heads of about 30 flowers, 8-15 mm across; calyx of 5 sepals fused into a tube, without glandular hairs; petals 5, forming 2 free wings, 2 are fused to form lower keel and 1 conceals the stamens and carpel, partly united with each other and the stamens; stamens 10, 9 fused to form a tube, 10th stamen free; carpel 1, style 1.
Fruits: A legume pod, straight, 1-seeded.
Habitat: Limestone pavement, sand-dunes, semi-open grassland, rocks.
Distribution: Occasional to frequent on limestone, very rare elsewhere.
Native status: Native
Of conservation interest: No