Hydrangea (English Wikipedia)

Chisholm, Hugh, ed. (1911). "Hydrangea" . Encyclopædia Britannica. Vol. 14 (11th ed.). Cambridge University Press. p. 34; see line five. ...but by the influence of sundry agents in the soil, such as alum or iron, they become changed to blue.

erowid.org (Global: 3,273^rd place; English: 1,926^th place)

"Erowid Hydrangea Vault". Erowid.org. Retrieved 31 May 2018.

gardenista.com (Global: low place; English: low place)

"Everything You Need to Know About Hydrangeas". Gardenista.com. 2018-06-10. Retrieved 15 June 2018.
"Hydrangeas: How To Change Color from Pink to Blue". Gardenista.com. 2016-05-10. Retrieved 15 June 2018.

goodhousekeeping.co.uk (Global: low place; English: low place)

"This plant has been named 'plant of the year' at the Chelsea Flower Show". 2018-05-22. Retrieved 31 May 2018.

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Chaney, R.; Axelrod, D. (1959). Miocene Floras of the Columbia Plateau: Part II. Systematic Considerations, by Ralph W. Chaney and Daniel I. Axelrod. Carnegie Institution of Washington. pp. 1–226.Miocene Floras of the Columbia Plateau at the HathiTrust Digital Library

hydrangeaderby.co.uk (Global: low place; English: low place)

"About Us | Hydrangea Derby". Hydrangeaderby.co.uk. February 23, 2012. Retrieved August 28, 2026.

ipni.org (Global: 1,260^th place; English: 1,313^th place)

"Hydrangea : International Plant Names Index". Ipni.org. Retrieved 2026-08-28.

jstor.org (Global: 23^rd place; English: 15^th place)

Hollick, Arthur (1925). "A New Fossil Species of Hydrangea". Bulletin of the Torrey Botanical Club. 52 (1): 21–22. doi:10.2307/2479996. JSTOR 2479996.

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"Hydrangea Gronov. ex L." Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2021. Retrieved 17 September 2021.
"Hydrangea Gronov. ex L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 25 April 2025.

merriam-webster.com (Global: 425^th place; English: 373^rd place)

"hydrangea". Merriam-Webster.com Dictionary. Merriam-Webster. OCLC 1032680871. Retrieved 15 September 2024.

nih.gov (Global: 5^th place; English: 5^th place)

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Weber, Marjorie G.; Keeler, Kathleen H. (2012-10-18). "The phylogenetic distribution of extrafloral nectaries in plants". Annals of Botany. 111 (6): 1251–1261. doi:10.1093/aob/mcs225. eISSN 1095-8290. PMC 3662505.

oxforddictionaries.com (Global: 1,689^th place; English: 1,562^nd place)

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"hortensia | Definition of hortensia in English by Oxford Dictionaries". Oxford Dictionaries | English. Archived from the original on December 7, 2017. Retrieved 2017-12-07.

rhs.org.uk (Global: 1,321^st place; English: 666^th place)

rhs.org.uk

"Hydrangea macrophylla (H)". RHS. 2025-02-04. Retrieved 2025-04-23.
"AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 96. Retrieved 6 November 2018.
"RHS Plantfinder - Schizophragma hydrangeoides var. concolor 'Moonlight'". Retrieved 6 November 2018.
"RHS Plant Selector - Schizophragma integrifolium". Retrieved 5 March 2021.

apps.rhs.org.uk

"RHS Plant Selector - Schizophragma hydrangeoides var. hydrangeoides 'Roseum'". Retrieved 3 June 2013.

rollmagazine.com (Global: low place; English: low place)

"Hydrangeas, Hydrangeas, Hydrangeas - Roll Gardening & Green :: Roll Magazine: Creative Living in the Hudson Valley". Rollmagazine.com. Retrieved 31 May 2018.

theguardian.com (Global: 16^th place; English: 11^th place)

Willsher, Kim (6 February 2014). "High danger hydrangea? French police hunt gang peddling 'cheaper weed'". the Guardian. Retrieved 31 May 2018.
Horton, Helena (Jul 29, 2026). "Hotter summers may force RHS to move hydrangeas to north of England". The Guardian. Retrieved Aug 28, 2026.

tufts.edu (Global: 192^nd place; English: 165^th place)

perseus.tufts.edu

Liddell, Henry George; Scott, Robert (1940). "ὕδωρ". A Greek-English Lexicon. Perseus Digital Library.
Liddell, Henry George; Scott, Robert (1940). "ἄγγος". A Greek-English Lexicon. Perseus Digital Library.
Liddell, Henry George; Scott, Robert (1940). "αγγεῖον". A Greek-English Lexicon. Perseus Digital Library.

uga.edu (Global: 3,057^th place; English: 1,881^st place)

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"Publications - UGA Cooperative Extension". Caes.uga.edu. Retrieved 31 May 2018.

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"The United States National Arboretum: Hydrangea FAQ". Archived from the original on 16 May 2013. Retrieved 27 November 2008.
"USDA: Hydrangea Questions and Answers". Archived from the original on 16 May 2013. Retrieved 31 May 2018.

usgs.gov (Global: 119^th place; English: 145^th place)

pubs.usgs.gov

Knowlton, F.H. (1926). "Flora of the Latah Formation of Spokane, Washington, and Coeur d'Alene, Idaho". Shorter contributions to general geology, 1925 (PDF) (Report). Professional Paper. Vol. 140. United States Geological Survey. pp. 17–55, plates VIII-XXXI. doi:10.3133/pp140A.

web.archive.org (Global: 1^st place; English: 1^st place)

"The United States National Arboretum: Hydrangea FAQ". Archived from the original on 16 May 2013. Retrieved 27 November 2008.
"hortensia | Definition of hortensia in English by Oxford Dictionaries". Oxford Dictionaries | English. Archived from the original on December 7, 2017. Retrieved 2017-12-07.
"USDA: Hydrangea Questions and Answers". Archived from the original on 16 May 2013. Retrieved 31 May 2018.

whiteflowerfarm.com (Global: low place; English: low place)

"All Hydrangea Varieties". Whiteflowerfarm.com. Retrieved August 28, 2026.

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"hydrangea". Merriam-Webster.com Dictionary. Merriam-Webster. OCLC 1032680871. Retrieved 15 September 2024.
Hylton, William H. (1974). The Rodale herb book: how to use, grow, and buy nature's miracle plants (Eighteenth Printing — September 1979 ed.). Emmaus, Pa.: Rodale Press Book Division. p. 474. ISBN 0-87857-076-4. OCLC 610291480.
Weber, Marjorie G.; Keeler, Kathleen H. (2012-10-18). "The phylogenetic distribution of extrafloral nectaries in plants". Annals of Botany. 111 (6): 1251–1261. doi:10.1093/aob/mcs225. eISSN 1095-8290. PMC 3662505.

Hydrangea (English Wikipedia)

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