Close-up photograph of an emu standing by a tree. The emu looks to the right side of the photo.

Close-up photograph of a cross-section of the stem of the fern Danaea nodosa. This photograph was taken in the Maricao Forest of Puerto Rico.

Close-up photograph of a cross-section of the stem of Danaea nodosa, a tropical fern. This photograph was taken in the Maricao Forest of Puerto Rico.

Close-up photograph of a cross-section of the stem of Danaea nodosa. This photograph was taken in the Maricao Forest of Puerto Rico.

Close-up photograph of the fruits, flower buds, and leaves of an unidentified plant growing in Mayaguez, Puerto Rico. The plant's more developed fruits are red, and green undeveloped fruits appear on the same branch below. Yellow-white buds are featured on the bottom right.

Habit photograph of common sow thistle, scientific name Sonchus platylepis, growing on the side of a rocky cliff. The plant is pictured in the foreground, and its flowers are yellow and its leaves serrated. Behind the plant to the right, there is a noticeable absence of light.

Photograph of a tree echium plant, scientific name Echium pininana, growing in the Canary Islands. The plant leans slightly to the left.

Photograph of the Lower Rose Garden at the Fort Worth Botanic Garden covered with snow. At bottom center is the "rose ramp", a wide set of triangular arrangements of roses bordered with short hedges with a water stream running along concrete steps down the middle of the ramp and stairs along both sides of the flowers. Below the "rose ramp", at center is a rectangular pond with shrubs and bushes on each corner, and several polygonal beds of flowers lined with hedges, all of which are covered in white snow. Above the garden is a narrow frozen lake lined with bare white trees. Along the bottom foreground is a metal barricade covered snow.

Photograph of the Mary Daggett Lake Library at the Fort Worth Botanic Garden. The library, located in the Rock Springs Center, contains bookshelves along the four corners of the room. At center is a wide gray fireplace with a portrait of Mary Daggett Lake hanging above, with bookshelves lined with books on both sides of the fireplace. At center, set upon a large rug, is a wooden table with two adjoining, cushioned wooden tables and a large white book atop it, as well as a pair of reclined white armchairs with adjoining white lamps behind the table. At right there is a large, tiled window, from which the fragrance garden is visible.

Photograph of a wood pile at the Fort Worth Botanic Garden, where a worker stands chainsawing a piece of wood from a cut trunk. The wood pile sits on a field of dirt along branches and boulders, and two shed-like structures are seen in the background.

Photograph of Carlina canariensis from Arguineguin, Grand Canaria Island. Three buds are at the center with radiating spiky leaves in rust-colored rocky soil.

Photograph of Ulex europaeus (Grose) in Arguineguin, Grand Canaria Island. Shrubby, thinly leafed plant with small yellow flowers in rust-colored soil.

Photograph of Ulex europaeus (Grose) in Arguineguin, Grand Canaria Island. A branch of the plant is shown with small yellow flowers, along with withered blooms. The leaves are short and slender with examples of both young green shoots and brown, dried ones.

Photograph of Ulex europaeus (Grose) in Arguineguin, Grand Canaria Island. Shrubby plant with small yellow flowers and short, thin-shaped leaves.

Photograph of stems and roots of Limonium tuberculatum from Arguineguin, Grand Canaria Island lying on a pink terrazzo tile.

Photograph of a rocky mountainside covered with shrubby vegetation and pine trees.

Photograph of flowers and stems of Limonium tuberculatum from Arguineguin, Grand Canaria Island, lying on a pink terrazzo tile.

Photograph of four unidentified seedlings, lined up on brown soil, showing the embryonic roots, stems, and leaves

Photograph of flowers and stems of Limonium tuberculatum from Arguineguin, Grand Canaria Island, lying on a pink terrazzo tile.

Aerial photograph of a mountain range with some areas densely forested and other areas with shorter vegetation. Trails or roads and cleared circular areas can be seen on the mountain in the foreground. Small clouds can be seen above the mountain range and clouds in the distance with clear blue sky above.

Photograph of large Cneorum shrub in the foreground with one large palm tree behind it. A white building and numerous tan-colored tents scattered are scattered across the background.

Photograph of a stem of Cneorum with withered small white flowers from Arguineguin, Grand Canaria Island.

Photograph of a stem of Cneorum with withered small white flowers from Arguineguin, Grand Canaria Island.

Close-up photograph of Cneorum stems with yellow flowers and gray-green terete-shaped leaves from Arquineguin in the Canary Islands.