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Horticultural Reviews, Volume 49


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van Gelderen and van Gelderen (2004).

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A set of three photographs of some commercial cultivars of Hydrangea quercifolia.

      (Source: Photo credits: Spring Meadow Nurseries, ©Proven Winners®, Color Choice®.)

      ‘Pee Wee’ is a relatively compact cultivar reaching 1.5 m tall, but has fairly small panicles, up to 12 cm long and with sepals that do not age to pink, but to brown. A yellow leaved sport of ‘Pee Wee’ was identified and is available as ‘Little Honey’. ‘Sike’s Dwarf’ is another compact cultivar growing 1.5 m tall and wide, with flowers larger than those of ‘Pee Wee’, and sepals that age to pink.

      There are at least four double flowered cultivars available commercially. ‘Brido’ (trade name Snowflake) has dense panicles to 30 cm in length, with double flowers that weigh down the branches and tend to make them droop. Discovered in the wild in Alabama in 1969, ‘Brido’ is a full‐size cultivar reaching 3 m tall at maturity. ‘Shannon’ is also double flowered, with up to 20 sepals per floret and less dense panicles that are held more upright than ‘Brido’ (Dirr 2004). ‘Shannon’ is also a relatively compact cultivar reaching around 1.5 m tall. Other possible sources of double flowers are ‘Cloud Nine’ and ‘Horvaria’, both of which are comparable to ‘Brido’ (van Gelderen and van Gelderen 2004).

      A commonly grown full size cultivar, ‘Flemygea’, grows to 2 m tall, with larger sepals than the species on 18 cm long upright panicles that age to light pink. Three cultivars, ‘Roanoke’, ‘Harmony’, and ‘Vaughn’s Lillie’ have extremely dense mophead‐like, rounded inflorescences that cause the branches to sag under the weight; all three are full size cultivars. ‘Alice’ is one of the largest cultivars available, reaching 4.5 m tall and wide, with large 30 cm panicles and sepals that age to pink. ‘Late Hand’ has large deeply lobed leaves that have the appearance of a hand shape; as mentioned previously, this cultivar is also reported to bloom up to a month later than is typical for the species (Dirr 2004; van Gelderen and van Gelderen 2004).

ID Plant name Date collected State Coordinates or Location
NA 74915 RJLGA2003‐049 1 November 2003 Alabama N33.38361W86.84194
NA 74925 MCCAL2004‐009 7 November 2004 Alabama N34.31472 W87.51222
NA 80223 MS‐2011‐033 21 September 2011 Mississippi N33.29412 W90.13285
NA 80229 MS‐2011‐039 21 September 2011 Mississippi N 33.91675 W 89.26345
NA 80232 MS‐2011‐042 22 September 2011 Mississippi N34.22403 W89.36282
NA 78055 LRC #7 19 September 2008 Alabama Little River Canyon National Preserve
NA 78023 AL #32 17 September 2008 Alabama Kathy Stiles Freeland Preserve Habitat
NA 77995 AL #4 Alabama Bankhead National Forest

      Molecular markers can be used to facilitate the selection process by screening germplasm for markers that are linked to a gene of interest. Many types of molecular markers exist and have been used for phylogenetic analyses (De Smet et al. 2015), hybrid verification (Rinehart and Reed 2010), linkage mapping (Waki et al. 2018; Wu et al. 2020), identification of unknown species (Joung et al. 2010), genetic diversity estimates (Rinehart et al. 2006; Reed and Rinehart 2007, 2009; Ito et al. 2013; Choi et al. 2017), and predicting success of interspecific hybridizations in Hydrangea (Granados Mendoza et al. 2013). Many types of markers have been used for these studies including simple sequence repeats (SSR, or microsatellites), single nucleotide polymorphisms (SNP), randomly amplified fragment polymorphisms (RAPD), rbcL sequence, plastid sequence markers (chloroplast and mitochondrial DNA), and internal transcribed spacer (ITS) sequences.