|Rhododendron subg. Rhododendron|
| Scientific classification |
|Subgenus:|| Rhododendron subg. Rhododendron |
| Rhododendron ferrugineum |
Rhododendron subgenus Rhododendron is a subgenus of the genus Rhododendron . With around 400 species, it is the largest of the eight subgenera (more recently reduced to five)  containing nearly half of all known species of Rhododendron and all of the lepidote (scales on the underside of the leaves) species.  
The subgenus has traditionally included three sections:
However, following phylogenetic analysis, Craven (2008) raised the appropriately named Pseudovireya subsection of Vireya to section rank, splitting it into two geographic clades, the Asian mainland species as Pseudovireya, and the Malesian species as Discovireya, making five sections in all.  The new sections are thus:
Characteristics: (Craven 2008)
Craven also provides a formal Key to the subgenus.
Rhododendron is a genus of 1,024 species of woody plants in the heath family (Ericaceae), either evergreen or deciduous, and found mainly in Asia, although it is also widespread throughout lowland and montane forests in the Pacific Northwest, California, the Northeastern United States, and especially in the highlands of the Appalachian Mountains of North America. It is the national flower of Nepal, as well as, the state flower of Washington and West Virginia in United States, the provincial flower of Jiangxi in China and the state tree of Sikkim and Uttarakhand in India. Most species have brightly colored flowers which bloom from late winter through to early summer.
The stamen is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium.
Papaver is a genus of 70–100 species of frost-tolerant annuals, biennials, and perennials native to temperate and cold regions of Eurasia, Africa and North America. It is the type genus of the poppy family, Papaveraceae.
Allotropa virgata is in the family Ericaceae and is the only species of the genus Allotropa. It is a perennial plant that gets its common names from the distinct white and red or maroon stripes along its erect peduncle. A. virgata are nongreen as they lack chlorophyll, instead obtaining nutrition from neighboring green plants through a fungal intermediate. Allotropa virgata feeds exclusively on Matsutake mushroom mycelium.
Catalpa bignonioides is a species of Catalpa that is native to the southeastern United States in Alabama, Florida, Georgia, Louisiana, and Mississippi. Common names include southern catalpa, cigartree, and Indian-bean-tree.
Rhodora was a section of subgenus Pentanthera in the genus Rhododendron, that has since been discontinued. It comprised two species, both deciduous shrubs native to eastern North America:
Rhododendron subg. Hymenanthes is a subgenus of the genus Rhododendron, with a widespread distribution in the temperate Northern Hemisphere. The species are evergreen shrubs and small to medium-sized trees, with medium-sized to large leaves. The flowers are large, produced in terminal trusses of 5-40 together.
Rhododendron spinuliferum is a species of Rhododendron native to Yunnan, southwestern Sichuan, and Guizhou China.
Rhododendron lochiae is a species of pretty looking shrub plants, one of only two recognised species of the genus found growing naturally in Australia, only in restricted mountain–top cloud forest habitats (endemic) within the tropical rainforests region of north eastern Queensland. The other "Rhododendron viriosum" was only formally classified as a separate species in 2002. It is a member of the plant family Ericaceae.
Sida acuta, the common wireweed, is a species of flowering plant in the mallow family, Malvaceae. It is believed to have originated in Central America, but today has a pantropical distribution and is considered a weed in some areas.
Rhododendron section Tsutsusi was a subgenus of the genus Rhododendron, commonly referred to as the evergreen azaleas. In 2005 it was reduced to a section of subgenus Azaleastrum. Containing 80 - 117 species, it includes both deciduous and evergreen types and is distributed in Japan, China and northeastern Asia. They are of high cultural importance to the Japanese. Among the species in this genus lie the largest flowering azaleas.
Rhododendron section Vireya (vireyas) is a tropical group of Rhododendron species, numbering about 300 in all. Vireyas are native to southeastern Asia and range from Thailand to Australia.
Rhododendron hippophaeoides (灰背杜鹃) is a species of flowering plant in the Ericaceae family. It is in the subgenus Rhododendron, subsection Lapponica. It is a small shrub, up to 4 feet (1.2 m) tall at maturity, native to altitudes of 2400–4800 meters in southwest Sichuan and many parts of Yunnan, China. Leaves are up to 1.5 inches long, gray-green above, and with overlapping yellowish-buff scales below. Flowers are bright rose or lavender-blue to bluish purple, or (rarely) white.
Trompettia cardenasiana is a spiny shrub bearing very small leaves, 0.35–0.5 cm (0.1–0.2 in) by 0.1–0.12 cm (0.04–0.05 in), a yellow trumpet-shaped campanulate flower, measuring about 3 cm (1.2 in) long and globose fruit. The growth habit is somewhat reminiscent of certain Lycium species. It is endemic to Bolivia, growing in dry, Andean valleys at altitudes of 2,000–2,500 m (6,600–8,200 ft) and 3,000–3,500 m (9,800–11,500 ft) and has been collected near the town of Cotagaita in Potosí Department.
The Bird-berry is a southern African evergreen shrub or small tree. It belongs to a genus which is used medicinally in many regions, 'Psychotria' being from the Greek for 'rejuvenating', in reference to the healing properties of certain species. Kew lists some 2,000 species of Psychotria growing throughout the warmer regions of both hemispheres, but only two of them occur in southern Africa, namely P. capensis and P. zombamontana.
Rhododendron subgenus Azaleastrum is a subgenus of the genus Rhododendron.
Rhododendron subg. Choniastrum is a subgenus of the genus Rhododendron, originally a section of subgenus Azaleastrum it was elevated to subgenus rank after cladistic analysis revealed that together with Rhododendron it formed a major clade, distinct from other sections of Azaleastrum.
Rhododendron subsection Brachycalyx is a subsection of the genus Rhododendron, in section Tsutsusi, subgenus Azaleastrum, consisting of fifteen species of Azaleas from Asia.
Rhododendron subsection Tsutsusi is a subsection of the genus Rhododendron, in section Tsutsusi, subgenus Azaleastrum, consisting of 66 species of Azaleas.
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