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Origin and Habitat: China.
- Petrocosmea rosettifolia C.Y.Wu ex H.W.Li
Description: Petrocosmea rosettifolia are quite small, only 5-7 cm high. They possess slightly succulent leaves of rather a light green colour. The whole plant is profusely covered with whitish hairs, giving a most unusual appearance. The flowers, even if small are most elegant, and of a lilac shade of blue or white. They forms lots offsets. Most of the plants labelled Petrocosmea rosettifolia are indeed Petrocosmea cryptica.
Bibliography: Major references and further lectures
1) Evan Hillhouse Methven Cox “New Flora and Silva”, Volume 11, 1938
2) Tim Tuttle “Culture of Petrocosmea: My Way” “As distributed to the National Capital Area Chapter of The Gesneriad Society in April 2009 http://nationalcapitalgesneriads.org/pdfs/culture%20of%20petrocosmea.pdf
3) Julian Shaw “A new species of Petrocosmea: Julian Shaw discovers that a gesneriad that has been in cultivation under the wrong name for more than 10 years is a new species” The Plantsman September 2011 pp 177-179. https://www.rhs.org.uk/about-the-rhs/publications/magazines/the-plantsman/2011-issues/september/Petrocosmea
4) Drew, R (2002) “Sussex Show, October 6th. The Alpine Gardener” 70(1): 82–85
5) Drew, R (2003) “Developing a collection of subalpine gesneriads”. The Alpine Gardener 71(3): 297–307
6) Li, Z-Y & Wang, Y-Z (2005) “Plants of Gesneriaceae in China”. Henan Science and Technology Publishing House, China
7) Middleton, DJ & Triboun, P (2010) “Two new species of Petrocosmea”. Thai Forest Bull., Bot. 38: 42–47
8) Wang, W (1985) “The second revision of Petrocosmea”. Acta Bot.Yunnan. 7(1): 49–68
9) Wang, W, Pan, K-Y, Li, Z-Y, Weitzman, AL & Skog, LE (1998) Petrocosmea. In: Flora of China Editorial Committee (eds) “Flora of China” Vol. 18. Science Press, Beijing, & Missouri Botanical Garden Press, St Louis
Cultivation and Propagation: Petrocosmea offsets free. Once removed offsets are treated just like cutting until they form roots.
Theys may never need large pots.
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