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'
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| Habit:
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?
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| Height:
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⇕
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| Width:
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⇔
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| Lifespan:
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⌛
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| Origin:
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✈
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| Poisonous:
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☠
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| Exposure:
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☼
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?
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| Water:
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◍
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?
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| Features:
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✓
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| Hardiness:
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☃
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| Bloom:
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❀
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?
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[[]]
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var.
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| Standard Cyclopedia of Horticulture
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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.
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.
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