Contains 5 accepted taxa overall.
Characteristics
Classification
Citation
RHODODENDRON Linnaeus, Sp. Pl. 392. 1753.
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TYPE: Rhododendron ferrugineum Linnaeus Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 2: 680. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Rhododendron alabamense | ALABAMA AZALEA | Native Rare-State | ||
| Rhododendron austrinum | FLORIDA FLAME AZALEA; ORANGE AZALEA | Native Rare-State FAC (NWPL) | ||
| Rhododendron canescens | SWEET PINXTER AZALEA; MOUNTAIN AZALEA | Native FACW (NWPL) | ||
| Rhododendron minus var. chapmanii | CHAPMAN'S RHODODENDRON | Native Rare-State Endangered-US FACW (NWPL) | ||
| Rhododendron viscosum | SWAMP AZALEA | Native OBL (NWPL) FACW (DEP) |
Identification Key
1. Plant ferruginous-lepidote with glandular-peltate scales; leaves evergreen, often revolute; corolla upper lobe with spots; stamens 10 per flower
1. Plant glabrous, hairy, or stipitate-glandular, not lepidote, without peltate scales; leaves evergreen or deciduous, plane; corolla upper lobe lacking spots; stamens 5 per flower
2
2. Leaves deciduous; corolla upper lobe lacking spots; stamens 5 per flower; native, sometimes cultivated, usually forming fruit
3
2. Leaves evergreen or nearly so; corolla upper lobe with or withou spots or flecks; stamens 5 or 10 per flower; cultivated, often not forming fruit
6
3. Leaves mostly fully developed or nearly so before flowers open, vegetative bud scales absent; flowers opening after appearance of leaves; corolla white, rarely pinkish, without blotches or spots on the upper lobe
3. Leaves mostly appearing simultaneous with or after flowers, vegetative bud scales often present; flowers opening before or with appearance of leaves; corolla white, pink, or yellow to orange, the upper lobe with or without contrasting or darker colored areas
4
4. Corolla white to pink, the tube darker colored and pinkish, upper lobe without contrasting or darker colored area
4. Corolla white, pink-tinged, the tube white to greenish or corolla yellow to orange, the tube yellow to reddish, the upper lobe often with darker or contrasting area (sometimes obscure)
5
5. Stems, leaf blade upper surface, and fruit eglandular-hairy; flowers fragrant; corolla white, rarely pinkish, upper lobe with contrasting yellowish area
5. Stems, leaf blade upper surface, and fruit stipitate-glandular; flowers usually inodorous or slightly fragrant; corolla yellow, orange, to orange-red (tube often orange-red or red), upper lobe with indistinct darker yellow, orange, or red blotch
6. Young stems villous, glandular; corolla white (infrequently pale red), upper lobe lacking flecks; stamens 10, longer than the corolla
6. Young stems strigose, eglandular; corolla variously colored, sometimes white, upper lobe with darker colored spots or flecks; stamens 5 or 10, shorter than to subequal to corolla
7
7. Leaf blades 1.7-3.2(4.5) cm long, 0.5-1.2 cm wide; corolla pink to red; stamens (4)5(6)
8
7. Leaf blades 1.5-5(7) cm long, 0.5-3 cm wide; corolla variously colored, including red; stamens (6)7-10
9
8. Pedicel white-strigose; corolla 3-4 cm long
8. Pedicel ferruginous-strigose; corolla 1.2-2.5 cm long
9. Corolla pink to rose-purple, (4.5)4.8-5.2(6) cm long; stamens shorter than the corolla
9. Corolla variously colored, 3.5-4(4.5) cm long; stamens subequal to corolla
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Azalea | Azalea Linnaeus, Sp. Pl. 150. 1753, nom. rej. vs. Loiseleuria Desvaux 1813. | TYPE: = Loiseleuria Desvaux 1813. | |
| Azaleastrum | Azaleastrum (Planchon) Rydberg, Mem. New York Bot. Gard. 1: 297. 1900. | BASIONYM: Rhododendron Linnaeus, subg. Azaleastrum Planchon, Fl. Serres 9: 75. 1853-1854. | TYPE: Azaleastrum albiflorum (Hooker) Rydberg (Rhododendron albiflorum Hooker) |
| Biltia | Biltia Small, Fl. S.E. U.S. 884, 1336. 1903. | TYPE: Biltia vaseyi (A. Gray) Small (Rhododendron vaseyi A. Gray) | |
| Chamaecistus | Chamaecistus Oeder, Fl. Danica 4, t. 9. 1762 ("1761"), nom. rej. vs. Loiseleuria Desvaux 1813. | TYPE: Chamaecistus procumbens (Linnaeus) Kuntze (Azalea procumbens Linnaeus) | |
| Chamaeledon | Chamaeledon Link, Enum. Pl. Hort. Berol. 1: 210. 1821. | TYPE: Chamaeledon procumbens (Linnaeus) Link (Azalea procumbens Linnaeus) = Loiseleuria Desvaux 1813. | |
| Hochenwartia | Hochenwartia Crantz, Inst. Rei. Heb. 2: 468. 1766. | TYPE: Hochenwartia canadensis (Linnaeus) Crantz (Rhodora canadensis Linnaeus) = Rhodora Linnaeus 1762. | |
| Hymenanthes | Hymenanthes Blume, Bijdr. 862. 1826. | TYPE: Hymenanthes japonica Blume | |
| Loiseleuria | Loiseleuria Desvaux, J. Bot. Agric. 1: 35. 1813, nom. cons. vs. Azalea Linnaeus 1753. | TYPE: Loiseleuria procumbens (Linnaeus) Desvaux (Azalea procumbens Linnaeus) | |
| Osmothamnus | Osmothamnus de Candolle ex Meisner, Pl. Vasc. Gen. 1: 246. 1839. | TYPE: Non designatus. | |
| Plinthocroma | Plinthocroma Dulac, Fl. Hautes-Pyrénées 419. 1867. | TYPE: Plinthocroma ferrugineum (Linnaeus) Dulac (Rhododendron ferrugineum Linnaeus) = Rhododendron Linnaeus 1753, by lectotypification. | |
| Rhododendros | Rhododendros Adanson, Fam. Pl. 2; 164. 1763. | TYPE: Non designatus. | |
| Rhodora | Rhodora Linnaeus, Sp. Pl., ed. 2. 561. 1762. | TYPE: Rhodora canadensis Linnaeus | |
| Rhodothamnus | Rhodothamnus Lindley & Paxton, Paxton's Fl. Gard. 1: 113, t. 22. 1850-1851, non Reichenbach 1827. | TYPE: Rhodothamnus camchaticus (Pallas) Lindley & Paxton (Rhododendron camchaticum Pallas) | |
| Stemotis | Stemotis Rafinesque, Sylva Tellur. 152. 1838. | TYPE: Non designatus. | |
| Tsutsusi | Tsutsusi Adanson, Fam. Pl. 2: 164. 1763. | TYPE: = Azalea Linnaeus 1753. | |
| Vireya | Vireya Blume, Bijdr. 854. 1826, non Rafinesque 1814. | TYPE: Non designatus. |