| In Iris it is situated on a cleft on the back of the petaloid divisions of the style. |
| Flowers of Nigella have a conspicuous perianth, differentiated into an outer whorl of five white, petaloid sepals and an inner whorl of eight, stalked nectaries. |
| The shape is most similar to petaloid A, but the deep emargination is more similar to that of the obovate shape. |
| The specimens collected were sessile and the pileus lateral, somewhat broadened at the free end, or petaloid. |
| Within this petaloid perianth is a membranous one, together with a boat-shaped bracteolate body, entire. |
| It has the most charming semi-double flowers, formed from four outer petals with several smaller, petaloid stamens inside. |
