The calyx and pistil of Frostweed, (Gray, 1858).

Calyx

The calyx and pistil of Frostweed, (Gray, 1858).

Flower of Frostweed, (Gray, 1858).

Flower

Flower of Frostweed, (Gray, 1858).

The ovary of Frostweed, cut across and magnified, (Gray, 1858).

Ovary

The ovary of Frostweed, cut across and magnified, (Gray, 1858).

"A genus of exogenous plants, which gives its name to the natural order Cistaceae; an order allied to Cruciferae and Capparideae, and containing about 200 known species of shrubs and herbaceous plants, chiefly natives of the south of Europe and north of Africa." — Chambers' Encyclopedia, 1875

Rock-Rose

"A genus of exogenous plants, which gives its name to the natural order Cistaceae; an order allied to…

Of the rock-rose family (Cistaceae), the frostweed or Helianthemum Canadense.

Frostweed

Of the rock-rose family (Cistaceae), the frostweed or Helianthemum Canadense.

Of the rock-rose family (Cistaceae), the plant and flower of Hudsonia tomentosa.

H. Tomentosa

Of the rock-rose family (Cistaceae), the plant and flower of Hudsonia tomentosa.

Of the rock-rose family (Cistaceae), the pinweed or Lechea minor.

Pinweed

Of the rock-rose family (Cistaceae), the pinweed or Lechea minor.