# Dendrobium sect. Rhizobium

Dendrobium section Rhizobium is a section of the genus Dendrobium.

## Description

Plants in this section have thick, fleshy to terete leaves produced along a thin and wiry stem.
The section was established in 1851 by John Lindley and Joseph Paxton. Species in this section was included in the genus Dockrilla, named after Alick Dockrill, by authors including David Jones, Mark Clements and Stephan Rauschert for some species formerly included in the genus Dendrobium. A 2008 paper, based on a study the molecular phylogenetics of a wide range of related orchids, concluded that "the splitting of Australasian dendrobiums into various genera by other authors is excessive and unnecessary" moving the species back to the section Rhizobium.

## Distribution

Plants from this section are found in Australia, New Guinea, New Caledonia and Vanuatu.

## Species

Dendrobium section Rhizobium comprises the following species:
| Name | Distribution | Elevation (m) |
| Dendrobium bowmanii Benth. 1873 | Australia ( Queensland and New South Wales) and New Caledonia. | 0–200 metres (0–656 ft) |
| Dendrobium brevicaudum D.L.Jones & M.A.Clem. 1994 | Australia ( Queensland) | 700–950 metres (2,300–3,120 ft) |
| Dendrobium casuarinae Schltr. 1918 | New Caledonia | 0–1,000 metres (0–3,281 ft) |
| Dendrobium caudiculatum M.A.Clem. & D.L.Jones 1996 | Papua New Guinea | 40–900 metres (130–2,950 ft) |
| Dendrobium chordiforme Kraenzl. 1910 | Papua New Guinea | 10–3,300 metres (33–10,827 ft) |
| Dendrobium contextum Schuit. & de Vogel ex J.M.H.Shaw 2003 | Papua New Guinea | 1,200 metres (3,900 ft) |
| Dendrobium crispatum (G.Forst.) Sw. 1799 | French Polynesia (Society Islands) | |
| Dendrobium cucumerinum MacLeay ex Lindl. 1842 | Australia ( Queensland) | 50–800 metres (160–2,620 ft) |
| Dendrobium erythraeum Schuit. & de Vogel 2003 | Papua New Guinea | |
| Dendrobium flagellum Schltr. 1912 | New Guinea | 150 metres (490 ft) |
| Dendrobium fuliginosum (M.A.Clem. & D.L.Jones) P.F.Hunt 1998 | New Guinea | |
| Dendrobium leptophyton Schuit. & de Vogel 2003 | Papua New Guinea | 900–2,000 metres (3,000–6,600 ft) |
| Dendrobium lichenastrum (F.Muell.) Rolfe 1905 | Australia ( Queensland) | 0–1,950 metres (0–6,398 ft) |
| Dendrobium linguiforme Sw. 1800 | Australia (Queensland and New South Wales) | 0–1,200 metres (0–3,937 ft) |
| Dendrobium mortii F.Muell. 1859 | New Caledonia, Australia (Queensland and New South Wales) | 300–900 metres (980–2,950 ft) |
| Dendrobium nothofageti (M.A.Clem. & D.L.Jones) Schuit. & de Vogel 2003 | Papua New Guinea | 2,800 metres (9,200 ft) |
| Dendrobium pugioniforme A.Cunn. ex Lindl. 1839 | Australia (Queensland and New South Wales) | 0–1,300 metres (0–4,265 ft) |
| Dendrobium racemosum (Nicholls) Clemesha & Dockrill 1964 | Australia (Queensland) | 800–1,500 metres (2,600–4,900 ft) |
| Dendrobium rigidum R.Br. 1810 | Australia(Queensland) and New Guinea | 700 metres (2,300 ft) |
| Dendrobium schoeninum Lindl. 1846 | Australia (Queensland and New South Wales) | 600 metres (2,000 ft) |
| Dendrobium striolatum Rchb.f. 1857 | Australia (New South Wales, Victoria and Tasmania ) | 1,000 metres (3,300 ft) |
| Dendrobium teretifolium R.Br. 1810 | Australia (Queensland and New South Wales) | 5–800 metres (16–2,625 ft) |
| Dendrobium toressae (F.M.Bailey) Dockrill 1964 | Australia (Queensland) | 50–1,220 metres (160–4,000 ft) |
| Dendrobium vagans Schltr. 1911 | New Caledonia, Fiji, Samoa, Vanuatu and the Santa Cruz Islands | 0–1,300 metres (0–4,265 ft) |
| Dendrobium wassellii S.T.Blake 1963 | Australia (Queensland ) | 300 metres (980 ft) |

## Natural Hybrids

| Image | Name | Parentage | Distribution |
| | Dendrobium × grimesii C.T.White & Summerh. 1934 | Dendrobium linguiforme × Dendrobium teretifolium | Queensland, Australia |