Rock Garden Plants
Hymenoxys richardsonii (Hook.) Cockerell trib. Helenieae 
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FamilyASTERACEAE
Genus speciesHymenoxys richardsonii (Hook.) Cockerell trib. Helenieae
SynonymsPicradenia richardsonii Hook.
 Hymenoxys biennis (A.Gray) H.M.Hall
Habitatdry, rocky slopes
Altitude1000-3400m
Descriptionleaves entire to pinnatipartite, segments long, linear, capitula 1-3, involucre 2-seriate, disc 7-17mm across, ligules 8-13, 7-15mm long
Size7-35cm
Coloryellow
Bloomsummer
Ca
Typesubshrub
Cultivationsunny, dry, rock crevices, protection against winter wet
alpine house, poor, drained soil, sun
Propagationseed in spring, barely covered, germ. 1 month, 10-16°C
cuttings in late spring and late summer
Territory Northern America
     Western Canada (Alberta , Saskatchewan )
     Northwestern U.S.A. (Colorado , Montana , Wyoming )
     North-Central U.S.A. (North Dakota )
     Southwestern U.S.A. (Utah )
     South-Central U.S.A.
BibliographyPlants of the World online powo.science.kew.org
International Plant Names Index www.ipni.org
Comments

ASTERACEAE

Hymenoxys richardsonii (Hook.) Cockerell, Bull. Torrey Bot. Club 31: 468 (1904)

Basionym:
Picradenia richardsonii Hook., Fl. Bor.-Amer. [Hooker] 1(6): 317 (1833)

Synonyms:
Actinea richardsonii (Hook.) Kuntze
Actinella richardsonii (Hook,) Nutt
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richardsonii typicus ined.

Synonyms:
Actinea biennis (A.Gray) Kuntze
Actinella biennis A.Gray
Hymenoxis biennis (A.Gray) H.M.Hall
Picradenia biennis (A.Gray) Greene

w. Canada, nw. USA, North Dakota, Utah
71 ABT SAS 73 COL MNT WYO 74 NDA 76 UTA

1000-3400m

richardsonii floribunda (A.Gray) K.F.Parker, Madrońo 10: 159 (1950)

Basionym:
Actinella richardsonii floribunda A.Gray, Mem. Amer. Acad. Arts, ser. 2. 4(1): 101 (1849)

Synonyms:
Hymenoxys floribunda (A.Gray) Cockerell
Picradenia floribunda (A.Gray) Greene
Picradenia richardsonii floribunda (A.Gray) W.A.Weber

Hymenoxys olivacea Cockerell

Colorado, s. USA
73 COL 76 ARI UTA 77 NWM TEX

1800-2700m

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