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Hibiscus calyphyllus
The lemonyellow rosemallow (''Hibiscus calyphyllus'', syn. ''Hibiscus calycinus, Hibiscus chrysantha, Hibiscus chrysanthus, Hibiscus rockii'') is a shrub from tropical Africa belonging to the Hibiscus genus.〔"Botanica. The Illustrated AZ of over 10000 garden plants and how to cultivate them", p 445. Könemann, 2004. ISBN 3-8331-1253-0〕 In 1883 this Hibiscus was offered for sale in England under the name ''Hibiscus chrysanthus''〔(The Gardeners' Year-book and Almanack: Volumes 24-26, Robert Hogg, 1883, p. 88 ).〕 with Port Natal, Cape Colony (now South Africa), identified as the source. By 1891 the same Hibiscus was identified as ''Hibiscus chrysantha''〔The Mayflower Magazine, Mayflower Publishing Co. New York 1891 (Hibiscus Chrysantha, Chromolithograph ).〕〔(Bulletin of the New York Botanical Garden, Volume 1, 1900, Page 148 ).〕 in the United States, a practice which may have continued into the 1930s and contributed to incorrect species identification. In 1892 the name ''Hibiscus calycinus''〔(Bulletin of Miscellaneous Information (Royal Gardens, Kew), Vol. 1892, Appendix 2: New Garden Plants of the Year 1891 (1892), page 36 ).〕 was designated as the correct name for the species; but, by 1894 the currently accepted name ''Hibiscus calyphyllus''〔>(Flora capensis: being a systematic description of the plants of the Cape colony, Caffraria, & Port Natal, 1894, p. 170 ).〕 is found in association with ''Hibiscus calycinus''. At the beginning of the 20th century, this Hibiscus was sold as seeds in the United States under the name ''Hibiscus Giant Yellow''.〔(Wholesale catalogue for market growers and florists, Peter Henderson & Co, 1903, Page 18, New York City )〕 Because of the similarity of the flowers, it is quite common to find Abelmoschus manihot confused with ''Hibiscus calyphyllus'' in the early 20th century gardening literature of the United States, particularly in the area of cold tolerance.〔(The Flower Garden; a handbook of practical garden lore by Ida Dandridge Bennett, 1903, page 108 ).〕〔(Success with flowers, a floral magazine, Volumes 11-12, 1900, Page 271 ).〕 If the species identification is correct, the 1903 report in The Flower Garden〔 states that: ''"Giant Yellow is a beautiful canary yellow with crimson throat, hardy as far north as St. Louis, but safer in the cellar above that latitude"'', then ''Hibiscus calyphyllus'' may have some degree of cold tolerance. St. Louis, Missouri is in USDA Zone 6a but there are currently no reports of ''Hibiscus calyphyllus'' overwintering in USDA Zone 6a; it is known to overwinter successfully in USDA Zone 8a.
''Hibiscus calyphyllus'' grows to 1-1.8 meters (3–6 feet) tall. It has flowers which grow to 8–10 cm (3–4 in) wide, with a yellow color and a brownish center.〔〔(Plantz Africa: Growing Hibiscus calyphyllus ).〕〔(Kumbula Nursery: Growing Hibiscus calyphyllus ).〕 Unlike many African Hibiscus, which are fall to late-fall bloomers, ''Hibiscus calyphyllus'' is a summer bloomer which means it can be grown in many locations in North American and Europe and produce viable seeds, which are easy to collect and germinate. If the seeds are started indoors early in February or March, ''Hibiscus calyphyllus'' will bloom the first year.〔 ''Hibiscus calyphyllus'' is a day-bloomer with the flowers opening several hours after sunrise and closing several hours before sunset. No hybrids of ''Hibiscus calyphyllus'' have been reported but it is interesting to note that Hibiscus syriacus and ''Hibiscus calyphyllus'' have identical diploid chromosome counts of 80.〔(Chromosome Counts for Malvaceae. )〕
The plant is used in the construction of huts by the Maasai people of Kenya.〔Bussmann, R. W., et al. (2006). (Plant use of the Maasai of Sekenani Valley, Maasai Mara, Kenya. ) ''J Ethnobiol Ethnomed'' 2 22.〕
==References==
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