This plant is some 30 cm tall, flowers yellow. Sepals are 7 mm long. The flower corolla (measured from the base of the flower) is 15 mm long. The visible part of the style is some 6-8 mm long. The whole plant is grayish-pale green, and very rough (both leaves and stems) but the hairs are adjacent not erect. Only sepals have erect hairs.
It was collected in S Croatia near Split.
It is thus difficult to determinate. I can give you descriptions of 5 croatians species of Onosma to the identification of this plant. All of them have pale yellow corolla. Similar species Moltkia petraea has purple blue flowers.
O. arenaria: 15-70 cm, lower leaves 45-180x4-13 mm, setae sometimes stellate, K 6-12 mm, C 12-17 mm,
O. pseudoarenaria: 20-90 cm, lower leaves 80-200x8-13 mm, setae stellate, K 8-10 mm, C 12-16 mm,
O. visianii: 15-60 cm, lower leaves 100-250x4-8 mm, simple setae in 1-2 rows, K 12-17 mm, C 15-20 mm,
O. echioides: 10-30 cm, lower leaves 20-60x1-7 mm, setae stellate, K 10-15mm, C 18-25 mm,
O. stellulata: 10-25 cm, lower leaves 40-140x7-15 mm, setae stellate, K 7-9 mm, C 15-18 mm.
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