Rhododendron sidereum

Billeder af Rhododendron sidereum

Beskrivelse

R. sidereum (Grandia). Buske eller små træer fra 3 til 12 m. Blade 9-16 x 4-6,5 cm. Blomsterne kommer i maj-juni og er creme til klar gul, undertiden med en rød basal plet. Indumentet på bladundersiden er lysebrunt/sølvhvidt. Vokser i krat, blandede skove og åbne nåletræsskoven ved 2.700 til 3800 m i N-Burma og V. Yunnan. Ikke særlig hårdfør i Danmark, døde af senfrost. Ligner R. grande, men denne har kirtler på blomsterstænglen.
Hans Eiberg

● R. sidereum aff. RHS #4440 frø. Foto: Hans Eiberg
● R. sidereum aff. RHS #TDA603 2015 frø. Foto: Hans Eiberg
● R. sidereum aff. RHS #TDA603 2015 frø. Gennemlysning: Foto: Hans Eiberg

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ARS
Flora of China
RBGE Herbarium; R. sidereum

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Flora of China

Shrubs or small trees, 3–10 m tall; branchlets and petioles with gray-white agglutinated indumentum when young, glabrescent. Petiole 15–25 mm; leaf blade leathery, narrowly oblong to oblong-lanceolate, 9–21 × 3.5–6.5 cm; base broadly cuneate or rounded; margin slightly revolute; apex obtuse or acute and apiculate; abaxial surface indumentum silvery-gray, thin, agglutinated, glabrous on midrib; adaxial surface dark-punctate, glabrous but with vestiges of juvenile hairs in midrib; midrib prominent abaxially, grooved adaxially. Inflorescence racemose-umbellate, 14–20-flowered; rachis 50–60 mm. Pedicel 1.5–3 cm, densely pale brown-tomentose; calyx oblique; teeth 8, ca. 1 mm, triangular, tomentose; corolla ventricose-campanulate, creamy-white to pale yellow, 3.5–4 cm, with crimson nectar pouches at base inside, lobes 8; stamens 16, unequal, filaments pubescent at base; ovary ca. 8 mm, densely fawn-tomentose, eglandular; style glabrous and slightly shorter than corolla but longer than stamens; stigma large and discoid. Capsule cylindric, oblique at base, 25–30 × 8–10 mm, ± fawn-tomentose. Fl. Apr–May, fr. Jul–Sep. Mixed forests on mountain slopes; 2400–3400 m. W Yunnan [NW Myanmar], Arunachal Pradesh.