Hydrangea L.
  • Sp. Pl. 1: 397. 1753. (1 May 1753)
  • Graybeard, sevenbark, hortensia [Greek hydor, water, and angeion, diminutive of angos, vessel or container, alluding to shape of mature, dehisced capsule]

Cite taxon page as 'WFO (2021): Hydrangea L. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-4000018510. Accessed on: 21 Sep 2021'

General Information

Shrubs or trees. Stems erect, ascending, or spreading. Bark exfoliating in grayish, brown, or reddish brown sheets. Branches erect, ascending, or spreading, sometimes arching; twigs with simple or branched trichomes. Leaves deciduous, opposite or 3-whorled; petiole present; blade ovate, elliptic-ovate, elliptic, or suborbiculate, sometimes lobed, herbaceous, margins serrate to serrulate, plane; venation pinnate. Inflorescences terminal, cymose panicles, 100–1000-flowered; peduncle present. Pedicels present. Flowers bisexual or marginal ones often sterile (these with a petaloid, salverform calyx); perianth and androecium epigynous or perigynous; hypanthium campanulate or hemispheric, completely adnate to ovary, weakly or strongly 7–10(–11)-ribbed in fruit; sepals persistent, 5, spreading or reflexed, deltate to shallowly triangular, usually glabrous, rarely abaxially sparsely hairy; petals 5, valvate, spreading or reflexed, white to yellowish white, ovate-lanceolate, elliptic, oblong, spatulate, or narrowly ovate to ovate, base sessile, surfaces glabrous; stamens 10; filaments distinct, terete or flattened proximally, gradually or abruptly tapered from base to apex, apex not 2-lobed; anthers depressed-ovoid or transversely oblong; pistil 2–4-carpellate, ovary completely inferior or nearly so, or 1/2 inferior, 2–4-locular; placentation axile proximally, parietal distally; styles persistent, 2–4, distinct or connate to middle or distally. Capsules hemispheric, suburceolate, or oblong-ovoid, coriaceous, dehiscence interstylar, creating elliptic to circular pore at base of styles. Seeds 10–40 per locule, light brown to dark brown, fusiform or ellipsoid. x = 18.

  • Provided by: [A].Flora of North America @ efloras.org
    • Source: [
    • 1
    • ]. 


    Hydrangea steyermarkii Standl., Publ. Field Mus. Nat. Hist., Bot. Ser. 22: 233. 1940.

    Arbustos, bejucos o frecuentemente epífitas. Hojas opuestas, deciduas o persistentes, enteras, dentadas o lobadas, pubescencia de tricomas estrellados o simples. Flores pequeñas; sépalos 4–5; pétalos 4–5; estambres 8–10; ovario 3–4-locular, óvulos numerosos. Cápsula 2–4-locular, apicalmente dehiscente; semillas numerosas.

    Rara o tal vez poco colectada, en bosques muy húmedos y nebliselvas, zonas atlántica y norcentral; 700–1450 m; fl nov–may, fr nov–mar; Nee 28428, Stevens 5631; Nicaragua a Guatemala y probablemente México. Las plantas juveniles frecuentemente son más abundantes que las adultas y tienen una apariencia curiosamente distinta. Son trepadoras delgadas con tallos filiformes y tienen numerosas raíces delicadas y hojas pequeñas. El género consiste de 23 especies distribuidas desde los Himalayas hasta Japón y las Filipinas, y en las Américas. H. macrophylla (Thunb.) DC., la "Hortensia", es frecuentemente cultivada en todas las regiones frías del mundo.

  • Provided by: [D].Flora de Nicaragua
    • Source: [
    • 2
    • ]. 

    Woody climbers or shrubs, inflorescence and adjacent stem pubescent with stellate hairs, or tomentose with long, curling silky hairs. Leaves opposite, simple, blades penninerved, margins remotely denticulate or entire, oval, broadest near middle, petiole stout. Inflorescence cymose (in Central America), terminal, or occasionally lateral, subtended by chartaceous, caducous involucral bracts; sterile flowers showy, pink or white, not always present; fertile flowers white or maroon, small; hypanthium hemispheric; calyx-lobes 4, inconspicuous, deltoid; petals 4, oblong, valvate, deciduous during anthesis; stamens 8, occasionally 10, filaments long and filiform or short and inconspicuous, anthers oblong to somewhat rounded; ovary inferior, 2- to 4-celled, styles 2-4, erect and spreading, or occasionally co- herent in bud and early anthesis, continuing to elongate with the maturing capsule; stigmas terminal and more or less decurrent on inner surface; ovules numerous, borne on axial placentae; capsule 2- to 4-celled, truncate, thick-walled, dehiscent at apex between the spreading styles; seeds numerous, very small, linear, arcuate.

  • Provided by: [B].Flora de Panama
    • Source: [
    • 3
    • ]. 

    Subshrubs, shrubs, or small trees, erect or climbing, deciduous or evergreen. Branchlets, leaves, and inflorescences variously hairy. Leaves opposite, rarely verticillate, exstipulate; leaf blade simple, margin entire, serrate, or rarely pinnately lobed. Inflorescence terminal, occasionally axillary, a corymbose cyme, umbellate cyme, or thyrse; bracts deciduous. Flowers fertile or sterile. Sterile flowers few (more numerous in cultivated varieties), sometimes absent, borne at margin of inflorescence, with sepals 2 or 5, petaloid, and enlarged. Fertile flowers usually very numerous, bisexual, small; pedicel short. Calyx tube adnate to ovary, 4- or 5-dentate, persistent. Corolla lobes 4 or 5, free, rarely connate and forming a calyptra, ovate or spatulate, valvate. Stamens (8 or)10(or 25), inserted on disc; filaments linear; anthers oblong to subglobose, apex subrounded to obtuse. Ovary inferior to 2/3 superior, imperfectly or perfectly 2-4(or 5)-loculed; placentation parietal or axile; ovules numerous. Styles 2-4(or 5), free or basally connate, persistent; stigmas terminal or decurrent along style adaxially. Fruit a capsule, dehiscing apically among styles, hemispheric to turbinate, small, apex projected or truncate. Seeds numerous, small, winged or wingless; seed coat thin, with reticulate or striate veins.

  • Provided by: [C].Flora Of CHina @ efloras.org
    • Source: [
    • 5
    • ]. 

    Arbustos erectos o escandentes o lianas, terrestres o epífitos. Hojas pinnadamente nervadas. Infls. umbelado o corimboso-cimosas (en CR), compuestas, a veces envueltas cuando jóvenes por brácteas caducas. Fls. blan- cas, rosadas o azules, el hipanto acostillado; fls. estériles ausentes o (usualmente) presentes y restringidas al margen de la infl., ± agrandadas, los sépalos petaloides, las otras partes usualmente ausentes; fls. fértiles con los sépalos 4 ó 5; pétalos 4 ó 5, valvados, 1– 3 mm, ovados o espatulados, deciduos durante la antesis; estam- bres 8(10); ovario 2 – 4(5)-locular; placentación axilar; estilos 2 – 4(5), que se alargan mucho al madurar los frs. Frs. con dehiscencia apical (entre los estilos).

  • Provided by: [G].Manual de Plantas de Costa Rica
    • Source: [
    • 6
    • 4
    • ]. 

    "Fls ± epigynous, 4–5-merous except the 2–4(5)-locular ovary; fertile fls small, with minute sep, short pet, 8 or 10 stamens, and 2–4(5) short, stout styles; sterile fls consisting only of a large, white or colored, spreading cal of 3 or 4 sep; fr a capsule, consisting of the enlarged, strongly ribbed hypanthium enclosing the ripened ovary, tipped by the persistent styles and dehiscing between them; shrubs or woody vines with opposite (rarely whorled) lvs and numerous small fls in crowded cymes; fls all perfect, or the marginal sterile, or all sterile. 80, widespread."

  • Provided by: [H].New York Botanical Garden
    • Source: [
    • 7
    • ]. 


    climbers shrubs

  • Provided by: [B].Flora de Panama
    • Source: [
    • 3
    • ]. 


    SELECTED REFERENCES Dirr, M. A. 2004. Hydrangeas for American Gardens. Portland. McClintock, E. 1957. A monograph of the genus Hydrangea. Proc. Calif. Acad. Sci., ser. 4, 29: 147–256. Pilatowski, R. E. 1980. A Taxonomic Study of the Hydrangea arborescens Complex. M.S. thesis. North Carolina State University. Pilatowski, R. E. 1982. A taxonomic study of the Hydrangea arborescens complex. Castanea 47: 84–98. St. John, H. 1921. A critical revision of Hydrangea arborescens. Rhodora 23: 203–208. Stern, W. L. 1978. Comparative anatomy and systematics of woody Saxifragaceae. Hydrangea. Bot. J. Linn. Soc. 76: 83–113.

  • Provided by: [A].Flora of North America @ efloras.org
    • Source: [
    • 1
    • ]. 

    Included Species

    Other Local Names

    Graybeard, sevenbark, hortensia [Greek hydor, water, and angeion, diminutive of angos, vessel or container, alluding to shape of mature, dehisced capsule]

     Information From

    Flora of North America @ efloras.org
    'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • A Flora of North America Association
    Flora de Panama
    Robert E. Woodson, Jr. and Robert W. Schery Annals of the Missouri Botanical Garden Vol. 67, No. 4 (1980), pp. ii-xxxiii
    • B Missouri Botanical Garden
    Flora Of CHina @ efloras.org
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    Flora de Nicaragua
    WD Stevens, CU Ulloa, A Pool and OM Montiel. Missouri Botanical Garden Press, 2001
    • D Missouri Botanical Garden
    World Flora Online Data. 2017.
    • E CC0 1.0 Universal (CC0 1.0).
    MBG Floras Images
    Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
    • F Missouri Botanical Garden
    Manual de Plantas de Costa Rica
    Hammel, B. E.; Grayum, M. H.; Herrera, C.; Zamora, N. Manual de Plantas de Costa Rica. Missouri Botanical Garden Press, 2003-2014
    • G Missouri Botanical Garden
    New York Botanical Garden
    Descriptions of plants should be attributed to the full citation for each individual article, chapter or book that is the source for each record, which should include the authors of original publication.
    • H Content licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
    • I CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    World Flora Online Data. 2018.
    • J CC0 1.0 Universal (CC0 1.0).