Rock Garden Plants
Horkelia  howellii (Greene) Rydb.   
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FamilyROSACEAE
Genus species var.Horkelia  howellii (Greene) Rydb. 
SynonymsPotentilla howellii Greene (basionym)
Territory Northwestern U.S.A.Southwestern U.S.A.CaliforniaOregon
thickets and steppes
Altitude600-1200m
Description basal leaves subcylindrical, pinnate, segments overlaping, elliptic to flabellate, 4-10mm, inflorescence open, flowers solitary, 1cm across, petals narrowly obcordate
Size10-50cm
Colorwhite, rose
Bloomsummer
Ca
Typetuft
Cultivationsunny site with a deep, drained soil
alpine house, rich, drained soil, sun
Propagationseed in spring, barely covered, germ. 1-3 months, 18-21°C
division in early spring; cuttings in late summer and fall
BibliographyFlora of North America www.eFloras.org
The Plant List (2013) www.theplantlist.org
Version 8.0
(c) 1990-2016 RNDr. Pavel Slabý