Crossword-Solution: HELIANTHEMUM 12 letters, 2 clues 🏆 scrabble score: 22

According to Torrey and Gray, the North American species of Helianthemum, when growing in poor soil, produce only cleistogamic flowers.

Dolichopus nigripennis behaved in the same manner with Potentilla tormentilla; and other Diptera with Stellaria holostea, Helianthemum vulgare, Bellis perennis, Veronica hederaefolia and chamoedrys; but some flies visited indifferently the flowers of these two latter species.

Dyer, the prostrate habit of Helianthemum prostratum “brings the capsules in contact with the surface of the ground, postpones their maturity, and so favours the seeds attaining a larger size.” The capsules of Cyclamen and of Oxalis acetosella are only occasionally buried, and this only beneath dead leaves or moss.

ROCK ROSE (_Helianthemum vulgare_).—There is an elegance and delicacy of colour about this little cistus which renders it one of the most charming of the many stars of the wayside, as it grows on Compton Hill.

The European frost-weeds or _Helianthemum_ include a group of species which are so closely allied, that ordinary botanical descriptions are not adequate to give any idea of their differentiating features.