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807 Yew

Taxus floridana
Critically Endangered (IUCN 2.3)[1]
Scientific classification
Kingdom:
Plantae
Division:
Pinophyta
Class:
Pinopsida
Order:
Pinales
Family:
Taxaceae
Genus:
Taxus
Species:
T. floridana
Binomial name
Taxus floridana
Natural range


Taxus floridana (Florida Yew) is a species of yew, found only in a small area of under 10 km² on

the eastern side of the Apalachicola River in northern Florida at altitudes of 15–30 m. It is

listed as an endangered species.[1][2]

Description

It is a evergreen coniferous shrub or small tree growing to 6 m (rarely 10 m) tall, with a trunk

up to 38 cm diameter. The bark is thin, scaly purple-brown, and the branches are spreading. The

shoots are green at first, becoming brown after three or four years. The leaves are thin, flat,

slightly falcate (sickle-shaped), 1–2.9 cm long and 1–2 mm broad, with a bluntly acute apex;

they are arranged spirally on the shoots but twisted at the base to appear in two horizontal

ranks on all except for erect lead shoots. It is dioecious, with the male and female cones on

separate plants; the seed cone is highly modified, berry-like, with a single scale developing

into a soft, juicy red aril 1 cm diameter, containing a single dark brown seed 5–6 mm long. The

pollen cones are globose, 4 mm diameter, produced on the undersides of the shoots in early

spring.[2][3]

It occurs in the same region as the even rarer Torreya taxifolia, and is similar to it in

general appearance, but can be told by the shorter, blunt-tipped (not spine-tipped) leaves and

the less strong smell of the crushed leaves. Distinction from other yew species is more

difficult, and like most yews it has sometimes been treated as a subspecies of Taxus baccata, as

T. baccata subsp. floridana (Nutt. ex Chapm.) Pilger.[4]

Cultivation and protection

The Florida Yew requires particular conditions for its slow growth. It is suited to a slight

acidic soil and partial shade, it is classed as USDA Zone 8 in its resistance to cold. It can be

grown from cuttings or seeds. It is protected in reserves at the Torreya State Park and at the

Nature Conservancy's Apalachicola Bluffs and Ravines Preserve; it has legal protection under the

United States and Florida Endangered Species laws.

The bark contains taxol, a compound that can be used to combat cancer, and kidney diseases. The

seeds and leaves, however, are poisonous to humans.

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