rockmat Rosaceae Petrophytum caespitosum (Nutt.) Rydb. Listen to the Latin symbol: PECA12 Other Fact Sheets
Leaf: Alternate (appear whorled), simple, evergreen, spatulate, 1/4 to 1/2 inch long, entire martgins, grayish green and silky often with pinkish edges.
Flower: A narrow 1 to 3 inch spike-like cluster of small white to light pink flowers on a single upright stem (2 to 3 inches tall), resembles a bottle brush, appear in late summer and early fall.
Fruit: Small light brown follicles in a tight spike-like cluster (several inches in length), ripen in late fall and persist through winter.
Twig: Gray, densely covered in foliage.
Bark: Gray, irregularly scaly.
Form: A prostrate, dense mat-forming shrub reaching only 6 to 8 inches high (with the exception of flower spike). Mats are often several feet across.
leaf fruit bark form1 map
Additional Range Information:
Petrophytum caespitosum is native to North America.
Range may be expanded by planting.
See states reporting rockmat.
External Links:
USDA Plants Database
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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