FL N. Middle United States 424 (1824)
WFO ID: wfo-0001047632
IPNI ID: urn:lsid:ipni.org:names:30006889-2
Verified by:
Shrub or small tree to 6m tall, usually non-rhizomatous (often strongly rhizomatous on the Coastal Plain), young twigs red-brown, occasionally yellow-brown, sparsely to densely covered with unicellular and multicellular eglandular hairs or with only multicellular eglandular hairs, rarely with only unicellular hairs or with unicellular and multicellular gland-tipped hairs. Vegetative bud scales glabrous or sparsely to densely covered with unicellular hairs abaxially; margin ciliate, rarely ciliate above and glandular below or completely glandular. Leaf blade membranaceous, ovate or obovate to elliptic, (3.1-)4.0-6.0(-7.9) x (1.3-)1.5-2.3(-3.1)cm; base acute to oblique; apex acute to obtuse, often mucronate; adaxial surface glabrous, occasionally sparsely to densely covered with unicellular hairs and multicellular eglandular hairs or both, rarely with only multicellular eglandular hairs or gland-tipped hairs or both unicellular hairs and multicellular gland-tipped hairs, the midvein sparsely to densely covered with unicellular hairs; abaxial surface glabrous, sometimes also glaucous, occasionally sparsely to densely covered with unicellular hairs, the midvein sparsely to densely covered with multicellular eglandular hairs, or with unicellular hairs and multicellular eglandular hairs; margin entire, occasionally minutely serrulate, ciliate with multicellular eglandular hairs; petiole 0.1-0.4(-0.6)cm long, sparsely to densely covered with unicellular hairs and multicellular eglandular hairs, rarely with unicellular hairs and multicellular gland-tipped hairs or with all three types. Flower bud scales chestnut brown, occasionally with a darker brown band following the margin near the apex; abaxial surface sparsely to densely covered with unicellular hairs but frequently glabrous; margin unicellular-cil-iate, occasionally ciliate above and glandular below, rarely completely glandular. Flowers appearing after the leaves have expanded, or sometimes as the leaves expand at higher elevations in the mountains; inflorescence a shortened raceme of 3 to 14 flowers. Pedicels (0.5-)0.7-1.4 (-2.7)cm long, sparsely to densely covered with unicellular hairs and multicellular gland-tipped hairs, occasionally with unicellular hairs and multicellular eglandular and gland-tipped hairs, rarely with unicellular hairs and multicellular eglandular hairs, or with only gland-tipped hairs. Sepals less than 0.1-0.2(-0.5)cm long, often varying in length on the same flower; margins glandular-fimbriate, occasionally setose or with both multicellular eglandular and gland-tipped hairs; abaxial surface densely covered with unicellular hairs and sparsely to densely covered with multicellular gland-tipped hairs, occasionally sparsely to densely covered with only unicellular hairs, or with unicellular hairs and multicellular eglandular hairs. Corolla white, occasionally with a pink or purplish tinge, rarely completely pink, fragrance sweet, the tube longer than the limb and gradually expanding into it; upper corolla lobe (0.6-)0.8-1.3(-1.6) x (0.3-)0.5-0.9(-1.2)cm; lateral lobes (0.7-)1.0-1.5(-2.1) x (0.2-)0.3-0.6(-0.9)cm; corolla tube (1.3-)2.0-2.8(-3.6)cm long, (0. l-)0.2-0.3(-0.4)cm wide at base; outer surface of corolla densely covered with unicellular hairs and multicellular gland-tipped hairs, the gland-tipped hairs continuing in lines up the corolla lobes, rarely also with multicellular eglandular hairs or lacking any one of the three types of hairs; inner surface of corolla sparsely to densely covered with unicellular hairs or glabrous. Stamens (2. l-)3.8-5.1 (-6.5)cm long, with dense terete or flattened unicellular hairs on proximal (1,9-)2.5-3.4(-4.0)cm of filament, exserted (1.2-) 1.6-2.5(-5.8)cm beyond throat of corolla. Style (3.0-)4.2-5.6(-7.2)cm long, exserted (1.5-)2.0-3.5(-4.3)cm beyond throat of corolla, with dense unicellular hairs on proximal (0.0-)0.4-1.7(-2.8)cm; stigma 0.1-0.2(-0.4)cm wide. Ovary 0.2-0.4(-0.5)cm long, 0. l-0.2(-0.4)cm wide at the base, densely covered with multicellular gland-tipped hairs and unicellular hairs, occasionally also with multicellular eglandular hairs or with only multicellular eglandular hairs over unicellular hairs. Capsules (0.7-)1.0-1.5(-1.8) x (0.3-)0.4-0.6cm, ovate to ovate-cylindric, moderately densely covered with unicellular hairs and sparsely to moderately densely covered with multicellular eglandular or gland-tipped hairs. Seeds pale to dark chestnut brown, ovate or elliptic to fusiform, (1.2-)1.5-2.6(-3.2) x 0.3-1.l(-1.2)mm, body (0.6-)0.8-1.4 (-1.9) x (0.2-)0.3-0.5(-0.7)mm; testa expanded and dorsiventrally flattened, surrounding the body, the cells elongate over the body of the seed, and shorter in the expanded portion of the testa, with tapering end-walls.
USA: Vermont and Maine to peninsular Florida, west to Texas and north to Arkansas
Stream banks, moist thickets, swamps, bayheads, low flatwoods, shrub balds, acid bogs.
Azalea viscosah., Sp. PL ed. 1,1:151 (1753). Type: in Virginia (holo, LINN; IDC 118:111.4). Azalea glauca Lamarck, Ency. Method. 1: 340 (1783). Rhododendron glaucum (Lam.) Sweet, Hon. Brit, ed, 2, 344 (1830). Type: (lecto. P (n.v.); photo of lecto. GH). Azalea viscosa var. glauca Aiton, Hort. Kew. 1: 204 (1789); Rhododendron viscosum var. glaucum (Aiton) Wood, Class Book Bot. 376 (1851), nom. illeg.; Rhododendron viscosum f. glaucum Fern., Rhodora 43: 623 (1941). Type: n.v,; no specimens or illustrations cited. Azalea viscosa var. glauca Michaux, FL Bor.-Amer. 1: 151 (1803), nom. illeg.; Rhododendron viscosum var. glaucum (Michaux) Torrey, FL N. Middle United States 1:425 (1824), nom. illeg. Type: in Carolina inferiore (lecto. P-MICHX; IDC 6211, 361.5). Azalea viscosa Marshall vm.palustris Marshall, Arbust. Amer. 16 (1785). Type: (probably at DWC, n.v.). Azalea viscosa L. vm.floribunda Aiton, Hort. Kew. 1: 203 (1789). Type: n.v. Azalea viscosa var. virens Michaux, FL Bor.-Amer. 1:151 (1803). Type: in Carolina inferiore (lecto. P-MICHX; IDC 6211, 361.6). Azalea tomentosa Dumont de Courset, Bot. Cult. ed. 2, 3: 336 (1811). Rhododendron viscosum var. tomentosum Rehder, Monogr. Azaleas 162-163 (1921). Type: n.v. Azalea hispida Pursh, FL Am. Septentr. 1:154 (1814). Rhododendron hispidum (Pursh) Torr., FL U.S. 1: 425 (1824). Azalea viscosa var. hispida (Pursh) Hook., Comp. Bot. Mag. 1: 100 (1835). A. glauca Lam. var. hispida (Pursh) Heynhold, Nomen. Bot. 1:108 (1840). Rhododendron viscosum (L.) Torr. f. hispidum (Pursh) Voss, in Vilm. Blumengart. 1: 588 (1894). R. viscosum (L.) Torr. var. hispidum (Pursh) Rehder, in Bailey Stan. CycL Hort. 121 (1900). Type: n.v. Azalea nitida Pursh, FL Am. Septentr. 1: 153-154 (1814). Rhododendron nitidum (Pursh) Torr., Fl. U.S. 1: 425 (1824). R. viscosum (L.) Torr. var. nitidum (Pursh) A. Gray, Manual of Botany, ed. 2, 257 (1856). Rhododendron viscosum (L.) Torr. var. nitidum (Pursh) A. Gray, Synop. FL N. A. 1: 41 (1878). Azalea viscosa L. var. nitida (Pursh) Britton, in Mem. Torrey Bot. Club 5: 248 (1893). Type: n.v. Azalea viscosa L. var. pubescens Lodd., Bot. Cab. 5: 441, (1821). Type: n.v. Azalea viscosa L. var. rubescens Lodd., Bot. Cab. 16: 1518 (1829). Rhododendron viscosum (L.) Torr. var. rubescens (Lodd.) Sweet, Hort. Brit. ed. 2, 344 (1830). R. viscosum (L.) Torr. f. rubescens (Lodd.) Rehder, Monogr. Azaleas 161 (1921). Type: n.v. Rhododendron viscosum (L.) Torr. f. roseum Hollick, in Bull. Torrey Bot. Club 18: 256 (1891). Type: n.v. Azalea oblongifolia Small, Fl. S.E. U.S. 883 (1903). Rhododendron oblongifolium (Small) Millais, Rhodod. 219 (1917). Type: Texas, Houston Co.: Grapeland, 1879, F. Tweedy s.n. (holo. NY). Azalea serrulata Small, Fl. SJE. U.S. 883 (1903). Rhododendron serrulatum (Small) Millais, Rhodod. 241 (1917). R. viscosum (L.) Torr. var. serrulatum (Small) Ahles, J. Elisha Mitchell Sci. Soc. 80: 173 (1964). Type: Florida, Lake Co.: vicinity of Eustis, 1-15 vi 1894, G. V. Nash 967 (holo. NY; photo of holo. A). Rhododendron viscosum (L.) Torr. var. aemulans Rehder, Monogr. Azaleas 165 (1921). Azalea viscosa L. var. aemulans (Rehder) Ashe, J. Elisha Mitchell Sci. Soc. 38:91 (1922). Type: Georgia, Randolph Co.: in low woods near Cuthbert, 9 v 1918, T. G. Harbison 39 (holo. A). Rhododendron viscosum (L.) Torr. f. coerulescens Rehder, Monogr. Azaleas 165 (1921). Type: North Carolina, Macon Co.: Highlands, 9 vii 1918, A. Rehder 66 (lecto., designated here, A). Rhododendron serrulatum (Small) Millais var. georgianum Rehder, Monogr. Azaleas 156 (1921). Azalea serrulata Small var. georgiana (Rehder) Ashe, J. Elisha Mitchell Sci. Soc. 38: 91 (1922). Type: Georgia, Charlton Co.: Folkston, 16 vii 1918, T. G. Harbison 68 (holo. A). Rhododendron serrulatum (Small) Millais f. molliculum Rehder, Monogr. Azaleas 155 (1921). Type: Florida, Lake Co.: Eustis, 23 vi 1919, T. G. Harbison 17 (holo. A). Rhododendron viscosum (L.) Torr. var. montanum Rehder, Monogr. Azaleas 164 (1921). Azalea viscosa L. var. montana (Rehder) Ashe, J. Elisha Mitchell Sci. Soc. 38:91 (1922). Type: North Carolina, Macon Co.: Highlands, 9 vii and 30 ix 1918, A. Rehder 58 (lecto., designated here as 9 vii 1918, A). Rhododendron viscosum (L.) Torr. f. rhodantha Rehder, Monogr. Azaleas 160 (1921). Type: Maryland, Prince Georges Co.: opposite Hyattsville, eastward. 31 v 1915, E. S. Steele s.n. (holo. US). Rhododendron coryi Shinners, Castanea 26: 156-157 (1961). Type: Texas, Tyler Co.: frequent on railroad right-of-way at pitcher-plant bog, Hyatt Bog, 2 mi S of Warren, 18iv 1930, V. L. Cory 57145 (iso. MINN).
Kron, K.A. (1993) A Revision of Rhododendron Section Pentanthera. Edinburgh Journal of Botany 50(3):329