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"Fagus sylvatica; 1. male catkins; 2. female do.; 3. the latter, with the scales of the involucre stripped off to show the ovaries at the apex; 4. a male flower; 5. a half-grown male with the involucre, now consisting of consolidated scales, forced back; 6. a ripe involucre opening and exposing the nuts; 7. a transverse section of a ripe nut; 8. the same of a young ovary." -Lindley, 1853

Common Beech

"Fagus sylvatica; 1. male catkins; 2. female do.; 3. the latter, with the scales of the involucre stripped…

The common name of hymenophyllum is filmy fern. The unilaterale variety has dark green, rigid fronds. This fern is native to Great Britain.

Habit and Detached Pinna with Involucre of Hymenophyllum Unilaterale

The common name of hymenophyllum is filmy fern. The unilaterale variety has dark green, rigid fronds.…

"Scabiosa atropurpurea. 1. a flower; 2. the involucre opened to show the ovary and calyx; 3. perpendicular section of fruit." -Lindley, 1853

Sweet Scabious

"Scabiosa atropurpurea. 1. a flower; 2. the involucre opened to show the ovary and calyx; 3. perpendicular…

The Resin Spurge (Euphorbia resinifera) is a flowering plant that superficially resembles a cactus. "Top of Stem of Euphorbia resinifera. a, involucre with inclosed flowers; b, section of same." -Whitney, 1911

Resin Spurge

The Resin Spurge (Euphorbia resinifera) is a flowering plant that superficially resembles a cactus.…