Petrophytum

Plant Characteristics

Origin:	✈	?

Cultivation

Exposure:	☼	?"?" is not in the list (sun, part-sun, shade, unknown) of allowed values for the "Exposure" property.
Water:	◍	?"?" is not in the list (wet, moist, moderate, dry, less when dormant) of allowed values for the "Water" property.

Scientific Names

Read about Petrophytum in the Standard Cyclopedia of Horticulture

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. CH The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

Cultivation

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Propagation

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

External links

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