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Rhododendron menziesii Menziesia goyozanense Til M Menziesia ciliicalyx

Rhododendron menziesii ssp. glabellum (Menziesia ferruginea)

 Rhododendron menziesii (Menziesia ferruginea), Foto: Paul Stangerup
Rhododendron menziesii (Menziesia ferruginea). Foto: Paul Stangerup

Rhododendron menziesii ssp. glabellum (Menziesia ferruginea) vokser i det vestlige Nordamerika fra Alaska i nord til Wyoming i syd. En opret voksende løvfældende busk, der kan blive mere end 3 meter høj. Blomsterne, som kan forekomme i store mængder i maj-juni, er krukkeformede, ca 1 cm lange med 5 kronblade og 8 støvdragere. Farven er oftest rødbrun-orange. Frugten er en lille kapsel på ca 5 mm med mange frø. Bladene på ca 5 cm er glandulære, friskgrønne med en blålig-hvid underside. Friske skud og stilke er let hårede, og barken på plantens træagtige dele er glat. Min plante er ca 20 år og nu næsten mandshøj. Den vokser fint i totalskygge, men blomstrer naturligvis bedst på et sted med rigeligt lys. Paul Stangerup
Flora of Nord America
Shrubs. Stems erect, spreading, or straggling; young twigs minutely pilose and hairy; (older twigs without peglike projections). Leaves deciduous, alternate, (crowded toward branch tips); petiole present; blade membranous, margins crenulate-serrulate, (rolled under in bud, abaxial surface 1/3+ visible except sometimes in bud). Inflorescences terminal umbelliform or corymbiform clusters on previous year’s shoots, 2-10-flowered; perulae ± persistent, scarious, margins minutely ciliate. Flowers bisexual, ± bilaterally symmetric; sepals 4[-5], connate ca. 3/4 their lengths; petals 4[-5], connate for ca. 2/3 their lengths, corolla deciduous, cylindric-urceolate, soon campanulate, (glabrous or finely puberulent adaxially); stamens 8 [5 or 10], included; anthers without awns, dehiscent adaxially by 2 longitudinal, terminal slits; ovary 4[-5]-locular; style included; stigma capitate. Fruits capsular, ovoid to ovoid-oblong or obovate, dehiscence basipetally septicidal. Seeds ca. 50-90, linear or narrowly ovoid, ± prolonged to form apiculate tip or elongate appendage, without wings; testa smooth, membranous. x = 13. Species 7-10 (2 in the flora): North America, e Asia (Japan). A close relationship of Menziesia and Rhododendron is hypothesized based on matK analysis. The slightly zygomorphic flowers of the 5-merous Menziesia are similar to those in many species of Rhododendron. Flattened multicellular scales present on the abaxial midrib are also found in Rhododendron sect. Tsususi and on closely related Tsusiophyllum, prompting K. A. Kron (1997) to suggest including both taxa within Rhododendron. Inclusion of Menziesia within Rhododendron is implied also by matK and trnK intron sequence analysis (Y. Kurashige et al. 2001), although its exact relationship remains unresolved.

Flora of N. America, Menziesia Flora of N. America
Kew's Herbarium
Kew's Herbarium; M. glabella

Craven, L.A. (2011). Diplarche and Menziesia transferred to Rhododendron (Ericaceae). Blumea 56: 33-35. Abstract: The genera Diplarche and Menziesia have been shown to be nested in Rhododendron based upon cladistic analyses of DNA data. Morphologically, the differences between Diplarche and Menziesia are not so great that their inclusion in Rhododendron is inappropriate and the species of these two genera are formally transferred to Rhododendron. The following new names are proposed: Rhododendron benhallii, R. chamberlainii, R. goyozanense, R. × kamatae, R. katsumatae, R. kroniae, R. menziesii, R. menziesii subsp. glabellum, R. multiflorum, R. multiflorum forma bicolor, R. multiflorum forma brevicalyx, R. multiflorum var. purpureum, R. pentandrum, R. pilosum, R. sophistarum, R. yakushimense.

Menziesia ciliicalyx Til M Menziesia goyozanense