View source for Petrophytum

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Petrophytum (petros, rock, and phyton, plant; alluding to its 
habitat). Rosaceae. A genus of 5 cespitose undershrubs with prostrate 
branches in W. N. Amer., allied to Spiraea, but differing in its 
follicles being dehiscent on both sutures and in its habit: lvs. 
crowded, spatulate or oblanceolate, entire: fls. in terminal racemes; sepals and petals 5; stamens 20; pistils 3-5, hairy, style slender, glabrous except at the base: follicles leathery, with few linear seeds. Only the following species has been intro. into cult, and is offered by 
several European nurseries. It is perfectly hardy and grows best in a 
rockery in a sunny and well- drained position between rocks; it 
demands limestone soil. Prop, is by division or by seeds treated like 
those of spirea, but the young seedlings are particularly impatient 
of too much moisture. P. caespitosa, Rydb. (Spiraea caespitosa, Nutt. 
Eriogynia caespitosa, Wats. Luetkea caespitosa, Kuntze). Densely 
cespitose, forming flat patches: lvs. oblanceolate, obtuse or 
mucronate, 1-ribbed, densely silky, 1/4-1/2 in long: fls. small, 
white, in dense spikes 1/2-1 3/4 in. long on upright stalks 1-4 in. long; petals spatulate, obtuse; stamens exserted. July, Aug. S. D. and Mont, to Calif, and New Mex. M.D.G. 1907:85.
Alfred Rehder.
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==Cultivation==
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===Propagation===
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===Pests and diseases===
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==Species==
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==Gallery==
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==References==
*[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963
<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->

==External links==
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