Rhododendron eastmanii

Kron & Creel

Novon 9: 377, figs. 1, 2. 1999 ,.

Common names: May white azalea
Treatment appears in FNA Volume 8. Treatment on page 473. Mentioned on page 458, 466, 467.

Shrubs or trees, to 5 m, not rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs unicellular and multicellular eglandular-hairy and unicellular-hairy. Leaves deciduous; petiole densely unicellular-hairy and sparsely to densely multicellular eglandular-hairy; blade ovate or obovate to elliptic, 4.3–7.1 × 1.8–2.9 cm, membranous, margins entire, plane, ciliate, multicellular eglandular-hairy, apex acute to obtuse, mucronate, surfaces sparsely scattered, multicellular eglandular-hairy, abaxial surface moderately to densely unicellular-hairy and multicellular eglandular-hairy, midvein densely unicellular-hairy and multicellular eglandular-hairy, secondary-veins sometimes multicellular eglandular-hairy, adaxial surface sparsely to densely unicellular-hairy, midvein densely unicellular-hairy. Floral bud-scales glabrous abaxially, margins unicellular-ciliate near apex, glandular along proximal 2/3. Inflorescences 5–9 flowered; bracts similar to bud-scales. Pedicels 5–11 mm, densely unicellular-hairy and sparsely to densely multicellular eglandular-hairy, sometimes multicellular glandular-hairy. Flowers opening after leaves have expanded, erect to horizontal, strongly fragrant (fresh during mid day); calyx lobes 0.5–1 mm (often varying in length on same flower), margins setose, multicellular eglandular-hairy, abaxial surface sparsely to densely unicellular-hairy and multicellular eglandular-hairy, sometimes sparsely multicellular, weakly glandular-hairy; corolla white, lobes pink tinged on newly opened flowers, with yellow to orange blotch on upper lobe (style white), funnelform, 24–50 mm, outer surface densely unicellular-hairy and sparsely to densely multicellular stipitate-glandular-hairy (glands usually weakly developed), inner surface densely unicellular-hairy, petals connate, upper lobe 9–17 mm, lateral lobes 11–25 mm, tube gradually expanding into lobes, 13–25 mm (equaling or much longer than lobes); stamens 5, exserted, ± unequal, 45–67 mm. Capsules borne on erect pedicels, 12–19 × 4–8 mm, sparsely to densely unicellular-hairy and multicellular eglandular-hairy. Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, ± loose.


Phenology: Flowering late spring–early summer.
Habitat: Forests on north-facing slopes near limestone
Elevation: 30-200 m

Discussion

Older collections of Rhododendron eastmanii were typically referred to R. alabamense, which flowers early in the spring before the leaves have expanded, and has inflorescence bud scales are unicellular-ciliate; in R. eastmanii the bud scale margins are glandular.

Selected References

None.

Lower Taxa

None.

... more about "Rhododendron eastmanii"
glandular-hairy +, eglandular-hairy +  and unicellular-hairy +
unicellular-hairy +
Mucronate (?) +, Acute (?) +  and Obtuse (?) +
Walter S. Judd +  and Kathleen A. Kron +
Kron & Creel +
smooth +  and vertically furrowed +
not flaky +
4.3 cm43 mm <br />0.043 m <br /> (7.1 cm71 mm <br />0.071 m <br />) +
obovate;elliptic +
membranous +
1.8cm;2.9cm +
yellow +  and orange +
scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
multicellular +
1.2 cm12 mm <br />0.012 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
eglandular-hairy +  and unicellular-hairy +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
May white azalea +
rotate to crateriform campanulate cylindric globose or urceolate +
30-200 m +
undifferentiated +
fusiform +
fragrant +
erect +  and horizontal +
expanded +
usually ovoid;cylindric +
Forests on north-facing slopes near limestone +
multicellular +
terminal +  and axillary +
unicellular-hairy +
1.1 cm11 mm <br />0.011 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
deciduous +
pink tinged +
24mm +  and 50mm +
multicellular +
unicellular-ciliate +  and ciliate +
eglandular-hairy +  and setose +
multicellular +
unicellular-hairy +  and eglandular-hairy +
stipitate-glandular-hairy +  and unicellular-hairy +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
multicellular +
glandular-hairy +, eglandular-hairy +  and unicellular-hairy +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
scale-like +
reduced +
not sticky +
multicellular +
eglandular-hairy +  and unicellular-hairy +
Flowering late spring–early summer. +
4-5-carpellate +
distinct +
tailed +, flattened-ellipsoidal +  and fusiform +
unequal +
procumbent +  and prostrate +
creeping +  and sprawling +
peltate +  and capitate +
straight +
multicellular +
eglandular-hairy +
Undefined tribe Empetraceae +
distinct +
Rhododendron eastmanii +
Rhododendron +
species +
flattened +
expanded +
expanding +
1.3 cm13 mm <br />0.013 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
multicellular +  and unicellular +
unicellular-hairy +  and eglandular-hairy +
0.9 cm9 mm <br />0.009 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
evergreen +, deciduous +  and perennial +
tree +  and shrub +
heterotrophic +, autotrophic +  and mycotrophic +