Rhododendron alabamense

Shrubs, to 3 (–5) m, usually not rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs scattered, multicellular eglandular-hairy (hairs unbranched), otherwise glabrous or moderately unicellular-hairy. Leaves deciduous; petiole unicellular and stipitate-glandular-hairy; blade ovate to obovate, 4–7.7 (–9.4) × 1.2–2.5 (–3.3) cm, thin, membranous, margins entire, plane, ciliate, eglandular-hairy, apex acute to obtuse, often mucronate, abaxial surface glabrous or unicellular-hairy, adaxial surface usually scattered eglandular-hairy, usually also unicellular-hairy. Floral bud-scales glabrous or glabrate abaxially, margins unicellular-ciliate. Inflorescences 6–7-flowered; bracts similar to bud-scales. Pedicels 4–12 mm, eglandular and/or stipitate-glandular-hairy, otherwise glabrous or moderately unicellular-hairy. Flowers opening before or with leaves, erect to horizontal, very fragrant; calyx lobes 0.1–3 mm, scattered eglandular-hairy and/or stipitate-glandular-hairy, otherwise sparsely to moderately unicellular-hairy, margins eglandular-hairy; corolla white, sometimes pink-tinged, with contrasting yellow blotch on upper lobe, funnelform, 25–42 mm, scattered stipitate-glandular-hairy (hairs often continuing in lines up lobes), otherwise sparsely to moderately unicellular-hairy on outer surface, petals connate, lobes 9–21 mm, tube usually ± gradually expanded into lobes, 15–31 mm (longer than lobes); stamens 5, much exserted, ± unequal, 37–69 mm. Capsules borne on erect pedicels, 14–22 × 3–4 mm, sparsely to moderately multicellular eglandular-hairy, otherwise moderately to densely unicellular-hairy. Seeds without distinct tails; testa expanded, dorsiventrally flattened, ± loose. 2n = 26.

Phenology: Flowering spring.
Habitat: Open, dry woodlands, rocky slopes
Elevation: 0-500 m

Ala., Fla., Ga., Miss., Tenn.

Discussion

Rhododendron alabamense may be most closely related to a clade containing orange-red-flowered species (K. A. Kron 1993). This species has sometimes been confused with R. eastmanii; R. alabamense flowers before or as the leaves expand whereas R. eastmanii flowers after the leaves have expanded. Hybrids with R. canescens are known.

Selected References

None.

Lower Taxa