Cold Hardy Seedlings

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Cold-Hardy Seedlings Sunset Zone USDA Minim. Species Price Potential Zone Temp. Origin Comments Bowenia serrulata $29 16 17 9b 23°F Australia Fernlike smaller plant, bipinnate. Ceratozamia hildae $29 15 16 17 8b 19 °F Mexico Only clustered leaflet cycad Ceratozamia latifolia $25 15 16 17 8b 19 °F Mexico Broad, flat leaflets Ceratozamia mexicana $25 15 16 17 8b 19 °F Mexico Long dark green leaves Ceratozamia robusta $29 15 16 17 8b 19 °F Mexico Erect vertical stature for species Ceratozamia sp. "Molongo" $25 15 16 17 8b 19 °F Mexico Newly identified species Cycas debaoensis $95 16 17 9b China Very rare split-leafed cycas. Cycas guizhouensis $49 14 15 16 17 8b 17.5°F China Highly endangered, cold-hardy Cycas panzhihuaensis $29 15 16 17 8b 19.2°F China Blue-green cold-hardy plant. Cycas pectinata $25 16 17 9b 26°F Thailand Trunking mountain cycad Cycas petraea $29 16 17 9b 25°F Thailand Cold-hardy, broad leaves Cycas revoluta $7 14 15 16 17 8b 19°F Japan The cold hardy King Sago Dioon angustifolium $19 14 15 16 17 8b 17.5°F Mexico Blue-gray, red emergent leaves. Dioon califanoi $35 16 17 9a 23°F Mexico Rare Oaxacan, keeled leaves Dioon edule Veracruz $12 14 15 16 17 8b 19 °F Mexico Type specimen. Very hardy. Dioon edule Rio Verde $15 14 15 16 17 8b 19 °F Mexico Wider leaflets than other edules Dioon edule Jacala, Hidalgo $15 14 15 16 17 8b 19 °F Mexico Blue-green leaves, upright habit Dioon edule Queretaro $19 14 15 16 17 8b 19 °F Mexico Bluest of the edules. Dioon holmgrenii $19 16 17 9a 23°F Mexico Rare Oaxacan, keeled leaves Dioon merolae $29 16 17 9a 23°F Mexico Overlapping Venetian blind leaflets Encephalartos aemulans $35 16 17 9a S. Africa Ultra-rare, dark green leaves Encephalartos altensteinii $25 16 9b 25.9°F S. Africa Tall Green Eastern Cape Giant Encephalartos friderici guilielmi (1 Gal) $60 14 15 16 17 8b S. Africa Fine-leafed, hardy, full sun Encephalartos horridus $45 16 17 9a 25°F S. Africa The classic S. African blue cycad Encephalartos lebomboensis Estatuene $29 16 9b 24.8°F Mozamb. Dark green glossy leaves Encephalartos lebomboensis Piet Retief $29 16 9b 24.8°F S. Africa Fine-leafed version of above. Encephalartos lehmannii $39 14 15 16 17 8b 21.5°F S. Africa Blue, sun, heat & cold tolerant Encephalartos natalensis "Vryheid" $29 16 17 9a 21.5°F S. Africa Natal Giant. Smoother leaves. Encephalartos natalensis "Highflats" $29 16 17 9a 21.5°F S. Africa Natal Giant. Broad leaflets. Encephalartos senticosus $19 16 17 9a S. Africa Very glossy green leaves Encephalartos villosus $19 16 17 9a S. Africa Very glossy green leaves Lepidozamia peroffskyana $25 16 17 9a Australia Spineless. Arching leaves, shade. Macrozamia fraseri $25 15 16 17 9a 21.5°F Australia Cold hardy, mediterranean habitat Macrozamia communis $19 15 16 17 9a 22°F Australia Cold hardy from SF type climate Macrozamia moorei $25 15 16 17 9a 22°F Australia Cold hardy, grows large trunk Macrozamia riedlei $19 15 16 17 9a 22°F Australia Cold hardy, mediterranean habitat Maurice Levin The Jurassic Garden at A&A Cycads Nursery: (818) 759-0600 Fax: (310) 859-0137 Email: [email protected] Website: http://cycads.com.

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Somatic Embryogenesis and Regeneration of Endangered Cycad Species
Somatic Embryogenesis and Regeneration of Endangered Cycad Species R.E. Litz and P.A. Moon V.M. Chavez Avila Tropical Research and Education Center Jardin Botanico, Instituto de Biologia University of Florida Universidad Nacional Autonoma de Mexico 18905 SW 280 Street Apartado Postal 70-614 Homestead FL, 33031-3314 04510 Mexico DF USA Mexico Keywords: Somatic embryo, gymnosperm, Cycadales, conservation Abstract The Cycadales (Gymnospermae) include some of the world's most endangered and rare plant species. Many of the cycad species are known only as single specimen trees (e.g., Encephalartos woodii), as very small populations in the wild (e.g., Ceratozamia hildae) or have become extinct in the wild (e.g., Ceratozamia euryphyllidia). All cycads are dioecious, so that seed production is no longer possible with the rarest of the species. Conditions for induction of embryogenic cultures from leaves of mature phase trees of several species in the family Zamiaceae have been reported, and plants have been regenerated from somatic embryos. Embryogenic cultures of two species have been successfully cryopreserved. These strategies should contribute to the conservation of these endangered species and could lay the basis for commercial propagation of these beautiful but rare plants. INTRODUCTION The Cycadales represent the most ancient surviving group of higher plants, having arisen during the Permian era and flourished in the Mesozoic and Jurassic periods. They have been referred to as "living fossils" (Gilbert, 1984). Norstog (1987) considered that the cycads are unique for the study of the evolution of development in higher plants. There are only three extant cycad families, the Cycadaceae, Stangeriaceae and Zamiaceae, and these contain approximately 224 species.
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