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Cultivar Check Lists for Ornamental Plants - Claude E. Phillips ...

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Tucker-24<br />

1980, 1981, 1985c, 1986c, 1991e). The entire orchid In<strong>for</strong>mation System is also available on<br />

compact disc from RHS. Holst (1999) discusses the cultivars of Catesetum. Japan Orchid<br />

Growers Assocation (n.d.) has excellent color photographs of cultivars derived from Cattleya.<br />

The slipper orchids (Cypripedium, Paphiopedilum, etc.) are discussed by Cash (1991). Groves<br />

(1995), Motes (1997), and Poliakoff (1987) uniquely list Vanda cultivars with the percentage of<br />

genetic background of each ancestral species. Gilmour, Greatwood, and Hunt (1976) give the<br />

names of intergeneric hybrids. Some colored photographs or orchid cultivars are given in<br />

Mikolajski (1999a). See, also, the ICRA <strong>for</strong> orchid grex names<br />

(http://www.rhs.org.uk/research/registration_orchids.asp).<br />

Origanum<br />

The cultivars of Origanum, the marjorams, are discussed by Tucker and Rollins (1989).<br />

Trehane (1989) and White (1998) list some additional cultivars.<br />

Osmanthus<br />

The cultivars of the devilweeds are discussed by Gelderen (1999). The evergreen<br />

cultivars are discussed by Seehawer (2000).<br />

Osmunda: see ferns<br />

Ostrya: see Carpinus<br />

Paeonia<br />

The cultivars of the peonies are first listed by Coit (1907), later by Beal (1920) and<br />

Kelsey and Dayton (1942), and most recently by Jelitto and Schacht (1990) and Trehane (1989).<br />

The most comprehensive listing is by Kessenich (1976). Page 91997) provides good colored<br />

illustrations. These checklists should be supplemented with Fearnley-Whittingstall (1999),<br />

Harding (1917), Klehm (1995), Rogers (1995), and Wister (1962) <strong>for</strong> fuller descriptions and a<br />

comprehensive bibliography. Haworth-Booth (1963), Haw (2001), and Krüssmann (1984-<br />

1986) also supply further in<strong>for</strong>mation on the tree peonies, P. suffruticosa Andrews. American<br />

peony hybrids are listed by Kessenich (1990). The selections of P. suffruticosa subsp. rockii S.<br />

G. Haw & L. A. Laucrier are listed by Rieck (1998). The intersectional hybrids of Itoh are<br />

discussed by Good (1996a). Daphnis hybrids of P. lutea Delav. ex Franch. are listed by Good<br />

(1996b, 1997), while the Saunders hybrids are listed by Hertle (1997). Hybrids of P. tenuifolia<br />

L. are listed by Rieck (1994), while hybrids of P. peregrina Mill. are listed by Rieck (1995).<br />

Hybrids of P. officinalis L., P. peregrina, and P. lactiflora Pall. are listed by Ehrardt (1988b).<br />

Later introductions have been published in the American Peony Society Bulletin. Additional<br />

cultivars are listed by Kortmann (1998).<br />

Pandorea: see Australian (& South African) plants<br />

Papaver<br />

The primary reference on poppy cultivars is Grey-Wilson (1993). The cultivars of the<br />

oriental (P. orientale L.), Iceland (P. nudicaule L.), and other poppies are also listed by Kelsey<br />

and Dayton (1942). Hybrids of the oriental poppies are discussed by Rothmund (1996).<br />

Parakohleria: see Gesneriaceae<br />

Parthenocissus<br />

The cultivars of Boston ivy, P. tricuspidata (Sieb. & Zucc.) Planch, are listed by Laar<br />

(1981b, 1992).<br />

Passiflora<br />

The cultivar of Passiflora, the passion flowers, are thoroughly discussed by<br />

Vanderplank (1991, 1996, 1998, 2000). Additional cultivars are discussed by Gottschalk<br />

(1991).<br />

Pelargonium<br />

The most readily available guides to geranium cultivars are Buczaki (1998); Krauss

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