Rhododendron canescens

(Michaux) Sweet

Hort. Brit. ed. 2, 343. 1830 ,.

Common names: Piedmont or southern pinxterbloom azalea
Endemic
Basionyms: Azalea canescens Michaux Fl. Bor.-Amer. 1: 150. 1803
Synonyms: Azalea candida Small
Treatment appears in FNA Volume 8. Treatment on page 469. Mentioned on page 459, 466, 467, 468, 470, 471.

Shrubs or trees, to 6 m, usually not rhizomatous. Stems: bark smooth to vertically furrowed, shredding; twigs scattered, multicellular eglandular and/or stipitate-glandular-hairy (hairs unbranched), otherwise moderately to densely unicellular-hairy. Leaves deciduous; petiole usually multicellular eglandular or stipitate-glandular-hairy, also unicellular-hairy; blade ovate to obovate, 2.5–10 (–13) × 1.2–3 (–4) cm, thin, membranous to chartaceous, margins entire, rarely minutely serrulate, plane, inconspicuously ciliate, eglandular-hairy (hairs appressed to margins), apex acute to obtuse, often mucronate, abaxial surface densely to sparsely unicellular-hairy, sometimes glabrous or glabrate, often also scattered eglandular-hairy, adaxial surface usually scattered eglandular-hairy, otherwise sparsely unicellular-hairy, sometimes glabrous. Floral bud-scales ± densely unicellular-hairy abaxially, margins usually unicellular-ciliate. Inflorescences 6–19-flowered; bracts similar to bud-scales. Pedicels 4–17 mm, usually eglandular-hairy, rarely stipitate-glandular and/or eglandular-hairy, otherwise sparsely to densely unicellular-hairy. Flowers opening before or with leaves, erect to horizontal, fragrant (usually musky-scented); calyx lobes 0.5–4 mm, surfaces and margins scattered stipitate-glandular and/or eglandular-hairy, otherwise usually densely unicellular-hairy; corolla deep pink to white with pink tube, without blotch on upper lobe, funnelform, 23–46 mm, scattered, multicellular stipitate-glandular-hairy (hairs not forming distinct lines), otherwise sparsely to densely unicellular-hairy on outer surface, petals connate, lobes 7–20 mm, tube ± gradually expanded into lobes, 13–27 mm (equaling or longer than lobes); stamens 5, much exserted, ± unequal, 31–64 mm. Capsules borne on erect pedicels, 12–33 × 3–6.5 mm, usually sparsely to moderately eglandular-hairy, otherwise ± densely unicellular-hairy. Seeds without distinct tails, flattened portion of testa well developed at each end; testa expanded, dorsiventrally flattened, ± loose. 2n = 26.


Phenology: Flowering spring.
Habitat: Moist to dry woods, pocosins, swamps and savannas, often along streams
Elevation: 0-500 m

Distribution

V8 917-distribution-map.gif

Ala., Ark., Fla., Ga., Ill., Ky., La., Miss., N.C., Okla., S.C., Tenn., Tex.

Discussion

Rhododendron canescens is most similar to R. prinophyllum and R. periclymenoides, although these three species do not constitute a clade (K. A. Kron 1993); they occasionally hybridize where their habitats and ranges overlap. In addition, putative hybrids with R. alabamense, R. atlanticum, R. austrinum, R. flammeum, R. periclymenoides, and R. calendulaceum are known.

Selected References

None.

Lower Taxa

None.

... more about "Rhododendron canescens"
eglandular-hairy +, glabrate +, glabrous +  and unicellular-hairy +
glabrous +, unicellular-hairy +  and eglandular-hairy +
Mucronate (?) +, Acute (?) +  and Obtuse (?) +
Walter S. Judd +  and Kathleen A. Kron +
(Michaux) Sweet +
smooth +  and vertically furrowed +
not flaky +
Azalea canescens +
10 cm100 mm <br />0.1 m <br /> (13 cm130 mm <br />0.13 m <br />) +
3 cm30 mm <br />0.03 m <br /> (4 cm40 mm <br />0.04 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (10 cm100 mm <br />0.1 m <br />) +
ovate;obovate +
membranous;chartaceous +
thin;1.2cm;3cm +
scale-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
unicellular-hairy +  and eglandular-hairy +
0.3 cm3 mm <br />0.003 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
Piedmont or southern pinxterbloom azalea +
multicellular +
pink +  and white +
unicellular-hairy +  and stipitate-glandular-hairy +
rotate to crateriform campanulate cylindric globose or urceolate +
2.3 cm23 mm <br />0.023 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
Ala. +, Ark. +, Fla. +, Ga. +, Ill. +, Ky. +, La. +, Miss. +, N.C. +, Okla. +, S.C. +, Tenn. +  and Tex. +
0-500 m +
undifferentiated +
fusiform +
pendulous +  and erect +
usually ovoid;cylindric +
Moist to dry woods, pocosins, swamps and savannas, often along streams +
multicellular +
terminal +  and axillary +
deciduous +
fragrant +
7mm +  and 20mm +
unicellular-ciliate +  and ciliate +
serrulate +  and entire +
unicellular-hairy +, eglandular-hairy +, stipitate-glandular +  and scattered +
parietal +, axile +  and placentation +
tenuinucellate +  and unitegmic +
unicellular-hairy +, eglandular-hairy +  and stipitate-glandular +
0.4 cm4 mm <br />0.004 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
scale-like +
reduced +
not sticky +
eglandular +  and multicellular +
unicellular-hairy +  and stipitate-glandular-hairy +
Flowering spring. +
4-5-carpellate +
Hort. Brit. ed. +
distinct +
tailed +, flattened-ellipsoidal +  and fusiform +
unequal +
procumbent +  and prostrate +
creeping +  and sprawling +
peltate +  and capitate +
straight +
unicellular-hairy +, eglandular-hairy +, stipitate-glandular +  and scattered +
Azalea candida +
distinct +
Rhododendron canescens +
Rhododendron +
species +
flattened +
expanded +
expanded +
1.3 cm13 mm <br />0.013 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
eglandular +  and multicellular +
unicellular-hairy +  and stipitate-glandular-hairy +
evergreen +, deciduous +  and perennial +
tree +  and shrub +
heterotrophic +, autotrophic +  and mycotrophic +