Castanea 27: 95 (1962)
WFO ID: wfo-0001047079
IPNI ID: urn:lsid:ipni.org:names:219516-2
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Shrub or small tree to 5m tall, usually non-rhizomatous; young twigs red-brown, sparsely covered with multicellular eglandular hairs, occasionally also sparsely to densely covered with unicellular hairs, or glabrous, rarely sparsely covered with only unicellular hairs. Vegetative bud scales glabrous, or rarely sparsely covered with unicellular hairs abaxially; margin unicellular-ciliate. Leaf blade membranaceous, ovate or obovate to elliptic, (5.2-)5.9-8.2(-10.9) x (1.4-)1.8-2.9 (-3.4)cm wide; base acute to oblique; apex acute to obtuse, often mucronate; adaxial surface sparsely covered with multicellular eglandular hairs, or glabrous, occasionally sparsely covered with unicellular hairs and multicellular eglandular hairs, rarely sparsely covered with only unicellular hairs, the midvein sparsely to densely covered with unicellular hairs; abaxial surface glabrous or sparsely to densely covered with unicellular hairs, rarely sparsely covered with only multicellular eglandular hairs, the midvein sparsely to densely covered with unicellular hairs and multicellular eglandular hairs, occasionally only with multicellular eglandular hairs; margin entire, ciMate with multicellular eglandular hairs, these usually somewhat more conspicuous than in Rhododendron canescens where the hairs are appressed to the margin of the leaf; petiole 0.2-0.5(-0.6)cm long, sparsely to densely covered with unicellular hairs and multicellular eglandular hairs, the unicellular hairs sometimes restricted to the adaxial groove, rarely sparsely covered with only multicellular eglandular hairs. Flower bud scales chestnut brown; abaxial surface glabrous, occasionally sparsely to densely covered with unicellular hairs; margin unicel-lular-ciliate, rarely also glandular. Flowers appearing before or with the leaves; inflorescence a shortened raceme of 6 to 15 flowers. Pedicels (0.4-)0.6-1.2(-1.9)cm long, sparsely covered with unicellular hairs and sparsely to densely covered with multicellular eglandular hairs, often lacking unicellular hairs. Sepals less than 0.1-0.2(-0.4)cm long, often varying in length on the same flower; margins setose, very rarely also with multicellular gland-tipped hairs; abaxial surface sparsely to densely covered with unicellular hairs and multicellular eglandular hairs, or with only multicellular eglandular hairs, rarely with unicellular hairs and multicellular eglandular and gland-tipped hairs, glabrous, or only with unicellular hairs or multicellular gland-tipped hairs. Corolla deep pink, the tube darker pink or crimson, occasionally pink to rose pink throughout, rarely white or pale pink, fragrance sweet, the tube longer than the Emb and gradually expanding into it; upper corolla lobe (0.6-)1.0-1.4(-1.6) x (0.4-)0.7-1.2(-1.4)cm; lateral lobes (0.9-)1.2-1.8(-2.5) x (0.4-)0.5-0.9(-1.4)cm; corolla tube (1.2-) 1.3-1.8(-2.2)cm long, (0.1-)0.2-0.3(-0.5)cm wide at base; outer surface of corolla sparsely to densely covered with unicellular hairs and multicellular eglandular hairs, or multicellular gland-tipped hairs, rarely covered with all three types of hairs, or with only multicellular eglandular hairs, the multicellular hairs often continuing up the corolla lobes; inner surface of corolla sparsely to densely covered with unicellular hairs. Stamens (3.2-)4.0-5.6(-6.8)cm long, with dense terete or flattened unicellular hairs on proximal (1.4-) 1.9-2.6(-3. l)cm of filament, exserted (1.9-)2.4-3.8(-5.0)cm beyond throat of corolla. Style (2.2-)4.2-5.9(-7.2)cm long, exserted (1.6-)3.0-4.5(-5.0)cm beyond throat of corolla, with dense unicellular hairs on proximal (0.0-)0.7-2.0(-3.5)cm; stigma (less than 0.1-)0.1-0.2cm wide. Ovary (Q.2-)Q.3-0.5(-0.6)cm long, 0.1-0.2(-0.4)cm wide at the base, densely covered with multicellular eglandular hairs and unicellular hairs, rarely with multicellular gland-tipped hairs and unicellular hairs. Capsules (1.2-)1.5-2.3(-2.5) x 0.3-0.5(-0.6)cm, narrowly ovate to cylind-ric, sparsely covered with unicellular hairs and sparsely to moderately covered with multicellular eglandular hairs. Seeds pale to dark chestnut brown, ovate or elliptic to fusiform, (1.0-)1.6-2.8 (-3.6) x 0.4-1,2(-1.3)mm, body (0.6-)0.8-1.3(-1.6)mm, (0.1-)0.2-0.5(-0.6)mm; testa rather closely fitted around the body of the seed, the cells short, with transverse end-walls, or isodiametric.
USA: Vermont, Massachusetts and New York, south and west to western Tennessee and east to the northern Atlantic Coastal Plain, south to South Carolina. Outlying populations in Tuscaloosa, Shelby and Clarke counties, Alabama and as far south as Clay and Dougherty counties, Georgia.
Upland woods, bluffs and stream banks, ridge-tops, sandy open woods.
Azalea periclymenoides Michaux, Fl. Bor.-Amer. 1: 150 (1803). A. periclymena Persoon, Synop. Plant. 1: 213 (1805). A. nudiflora (L.) var. periclymenoides (Michx.) Heynhold, Nomen. Bot. 1:108 (1840). Type: inNew Jersey. A. Michauxs.n. (lecto., designated here, P-MICHX; IDC #6411,36:11.2). Azalea lutea L., Sp. PL ed. 1, 1: 150 (1753). Rhododendron luteum (L.) C. K. Schneider, Handb. Laubholsk. 2: 500 (1911), non R. luteum Sweet, Hort. Brit. ed. 2, 343 (1830). Type: 215.2 K[alm], (lecto. LINN; IDC 118:111.2). Azalea nudiflora L., Sp. PL ed. 2,1: 214 (1762), nom. illeg. Rhododendron nudiflorum (L.) Torr., FL N. Middle United States 1: 424 (1824), nom. illeg. Type: as for A. lutea L. Rhododendron periclymenoides (Michx.) Shinners f. eglandulosum Seymour, FL New England 429 (1969). Type: as for A lutea L. Azalea nudiflora L. var. alba Aiton, Hort. Kew. 1: 203 (1789). A. periclymenoides Michx. var. alba Pursh, FL Am. Septentr. 1: 152 (1814). Rhododendron nudiflorum (L.) Torr. var. album (Pursh) C. Mohr, PL Life Ala. 653 (1901). Rhododendron nudiflorum f. album Rehder, Monogr. Azaleas 137 (1921). Type: n.v. Azalea nudiflora L. var. carnea Aiton, Hort. Kew. 1:203 (1789). A. periclymenoides (Michx.) var. carnea Pursh, FL Am. Septentr. 1: 152 (1814). Type: n.v. Azalea nudiflora L. var. papilionacea Aiton, Hort. Kew. 1: 203 (1789). A. periclymenoides (Michx.) var. papilionacea (Aiton) Pursh, FL Am. Septentr. 1: 152 (1814). Rhododendron nudiflorum (L.) Torr. var. papilionaceum (Aiton) Zabel, in Beissner, Schelle & Zabel, Handb. Laubholsk. 380 (1903). Type: n.v. Azalea nudiflora L. var.partita Aiton, Hort. Kew. 1:202 (1789). A. periclymenoides (Michx.) var. partita (Aiton) Pursh, FL Am. Septentr. 1: 152 (1814). Type: n.v. Azalea nudiflora L. var. rutilans Aiton, Hort. Kew. 1: 203 (1789). A. periclymenoides (Michx.) var. rutilans (Aiton) Pursh, FL Am. Septentr. 1: 152 (1814). Type: n.v. Azalea periclymenoides Michaux var. polyandra Pursh, Fl. Am. Septentr. 1: 152 (1814). Rhododendron nudiflorum (L.) Torr. vm.polyandrum (Pursh) G. Don, Gen. Syst. 3: 847 (1834). Azalea nudiflora var. polyandra (Pursh) DC, Prodr. 7: 717 (1839). Type: n.v. Azalea nudiflora var. rosea Hoffmannsegg, Verz. der Pflanz. Kult. 3rd sap. 23 (1826). Type: n.v. Azalea nudiflora var. calycosa Wood, Class Book Bot. 490 (1872). Type: n.v. Azalea nudiflora L. var. glandifera Porter, Bull. Torrey Bot. Club 27: 508 (1900). Rhododendron nudiflorum (L.) Ton*, var. glandiferum (Porter) Rehder, Monogr. Azaleas 138 (1921). R. nudiflorum (L.) Torr. f. glandiferum (Porter) Fern., Rhodora43:619 (1941). Azalea periclymenoides f. glandifera (Porter) Uttal, in Sida 3: 169 (1988). Type: (Syntypes probably at PH, n.v.).
Kron, K.A. (1993) A Revision of Rhododendron Section Pentanthera. Edinburgh Journal of Botany 50(3):319