Dendrobium speciosum

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Dendrobium speciosum, commonly known as the Sydney rock orchid or rock lily,[2] is a highly variable Australian native orchid that forms a species complex. Its varieties can be found in a range of habitats as an epiphyte (on branches or trunks of trees) or a lithophyte. It has a continuous distribution along the east coast of Australia and in distinct populations along the Tropic of Capricorn. As a lithophyte, it forms gigantic spreading colonies on rocks and cliff faces, often exposed to full sun, with its roots forming dense, matted beds across the rock that anchor the plant. It can be found at altitudes from sea level to 900 metres (3,000 ft).

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Description
There are two to five thick, leathery leaves originating from the top of each pseudobulb. These leaves can remain on the plant for up to 12 years. The erect or curved pseudobulbs are large, up to 45 cm (18 in) long. They are thickest at their base, measuring 5 to 7 cm (2.0 to 2.8 in), and taper towards the apex (3 cm (1.2 in)). The showy flowers grow in long racemes on straight or slowly arching, long, starchy stems. Some varieties produce 100 or more 2 to 5 cm (0.8 to 2.0 in), sweetly fragrant flowers per raceme in winter or spring. Flower colour, depending on variety, can be white, cream, yellow or dark yellow. Some cultivars have golden hued flowers.[4] The (predominantly) white labellum is covered with purple dots and veined with red and purple.

This orchid is popular in cultivation, growing into a large specimen that does well outdoors in climates with a mild winter. It may be grown in an open, coarse orchid growing medium, on a sturdy tree with an open canopy, or as a terrestrial in a well-drained position. It requires very bright light to full sun. Watering is year round in moderation. It is very temperature tolerant as long as it receives good warmth during the growing season. Frost, however, can cause extensive defoliation, an event the plant may require years to recover from. In cultivation D. speciosum can develop extremely large pseudobulbs, and benefits from regular fertilisation.[3] Even in ideal cultivation conditions it may not flower every year, especially so in plants from more southern populations.

The 1889 book The Useful Native Plants of Australia records that common names included "rock lily" and that "The large pseudo-bulbs have been eaten by the aborigines, they, however, contain but little nutritive matter."

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https://en.wikipedia.org/wiki/Dendrobium_speciosum