Spyridium fontis-woodii

Spyridium fontis-woodii, commonly known as Woods Well spyridium, is a species of flowering plant in the family Rhamnaceae and is endemic to a small area of Coorong National Park in South Australia. It is a slender shrub with softly-hairy young stems, broadly egg-shaped to broadly heart-shaped leaves with the narrower end towards the base, and head of white to cream-coloured flowers.

Description
Spyridium fontis-woodii is a slender shrub that typically grows to a height of up to 1.8 m, its young stems softly-hairy with rust-coloured or greyish, simple and star-shaped hairs. The leaves are broadly egg-shaped to broadly heart-shaped with the narrower end towards the base, 4.0–8.8 mm long and 3.5–6.5 mm wide on a petiole 1–2 mm long with brown, egg-shaped stipules 1.6–2.6 mm long at the base. The leaves are covered with white to greyish hairs, densely so on the lower surface. The heads of flowers are 8–13 mm in diameter with 4 or 5 floral leaves at the base, the individual flowers densely packed, sessile, and white to cream-coloured. The floral tube is 0.2–0.5 mm long, the sepals 0.7–0.8 mm long and the petals 0.3–0.4 mm long. Flowering has been observed in October and the fruit is a capsule about 2 mm long.

Taxonomy
Spyridium fontis-woodii was first formally described in 2012 by Jürgen Kellermann and William Barker in the journal Muelleria from specimens collected near Woods Well in Coorong National Park in 1995. The specific epithet (fontis-woodii) is a reference to the type location, fons being a Latin word meaning "well" or "spring".

Distribution
This species of Spyridium grows in open shrubland on partly-exposed limestone, and is endemic to an area near Woods Well in the Coorong National Park in South Australia.

Conservation status
This species is listed as "critically endangered" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999. The main threats to the species include clearance of native vegetation, road maintenance, browsing by rabbits and hares, and weed invasion.