1) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "Though 'Halcyon' is not the bluest hosta now available, no blue hosta has yet to match the balance of color, size, habit and growth rate that has made 'Halcyon' the classic medium-sized blue hosta...One simply doesn't have a hosta collection until it contains at least one clump of 'Halcyon' ...is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s."

2) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s....The first sport...was aptly named 'Goldbrook Glimmer', discovered by Sandra Bond of Goldbrook Plants in England...features a narrow "glimmer" or blaze of green down the middle of the blue leaves...The variegation is most pronounced in cooler climates and early in the season...In especially warm climates, the mound will appear a solid blue by the end of the summer."

3) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s....I have difficulty choosing a single favorite hosta but, when I am pressed, more often than not H. 'June' is my choice. This queen of hostas is the best-known sport of 'Halcyon', taking the dusty blue leaves of the parent and adding a splash of yellow to the centers of the leaves...As with 'Goldbrook Glimmer', climate plays a huge part in the appearance of 'June'. It needs a little bit of direct sun early in the season to bring out the brightest golden-yellow tones in the centers of the leaves, while cooler temperatures are needed for the best blue coloration. (Specimens of 'June' that I've seen in Britain and New Zealand surpass all description.)"

4) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "H. 'El Niňo' was officially registered and patented...as a seedling of 'Halcyon' . However, its uncanny similarity to 'Halcyon' in habit and leaf shape strongly suggests that it is in fact a sport of 'Halcyon' ...Whether a seedling or a sport, 'El Niňo' is a beautiful hosta..."

5) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s...." Cross lists the sports of 'Halcyon' that have a yellow medial (center) variegation:

H. 'June' H. 'Paradise Joyce' H. 'Kiwi Classic'

H. 'Remember Me' H. 'Touch of Class' H. 'June Fever'

6) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s....Traditionally, sporting involves the cells in a section of a leaf (either margin or center) changing color...These sports simply lack the wax coating that makes the hosta leaves appear blue...I find it impossible to see any differences between these green sports..." Cross lists the all-green sports of 'Halcyon' including:

H. 'Devon Green' H. 'Valerie's Vanity' H. 'Canadian Shield' H. 'Peridot'

H. 'Emerald Coast' H. 'Grünspecht' H. 'Kryptonite'

7) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s....There are a number of yellow hostas in the Halcyon Group...all sports from 'June'.." Cross lists the all-golden yellow sports of 'June' including:

H. 'English Sunrise' H. 'May' H. 'Kiwi Gold Star'

H. 'June's Gold' H. 'Early Times' H. 'Prosperity'

8) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "...'Halcyon' is a first-generation member (TF 1 × 7) of the legendary Tardiana Group of hostas, which consists of hybrids of 'Tardiflora' × H. sieboldiana 'Elegans', produced in England by Eric Smith,  the master hybridizer of blue hostas, in the 1960s....Some recent additions to the Halcyon Group are the margin-variegated sports..." Cross lists these sports including:

H. 'Sleeping Beauty' H. 'First Frost' H. 'Silver Shadows'

9) An article about the Halcyon Group by Peter Cross in The Hosta Journal (2004 Vol. 35 No.2) says, "(At one time 'Kryptonite was thought to be a sport of 'Blue Wedgwood', but it is now generally held to be a sport of 'Halcyon' .)"

10) An article by Warren I. Pollock in The Hosta Journal (2010 Vol. 41 No. 1) states that, "Not long ago the Margin Halcyon Series comprised just three sports of 'Halcyon' ...'Sleeping Beauty'...'First Frost'...El Nino...new members have been recently introduced...'Great Escape'...and 'Blue Ivory'."

11) An article by Warren I. Pollock in The Hosta Journal (2010 Vol. 41 No. 1) states that, "Curiously, the patent for 'El Nino' states it is a "hybrid of 'Halcyon' × a selection of H. 'Tardiflora'...Hosta authorities agree that most likely 'El Nino'is not a seedling of 'Halcyon', but a sport of 'Halcyon' found in a tissue-cultured batch in the Netherlands."