Rhododendron rhodostomum Sleumer

Reinwardtia 1960. 5: 157.

WFO ID: wfo-0000405502

IPNI ID: urn:lsid:ipni.org:names:333230-1

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Description

Shrub to 60cm; branches spreading. Twigs 1–1.5mm in diameter, rounded, densely covered with sub-stellate, shortly stalked scales at first, becoming glabrescent and distinctly warty and rough to the touch; internodes 2–6cm. Leaves 4–5 together in pseudowhorls. Blade 20–35 x 10–21mm, elliptic or obovate-elliptic, rarely broadly obovate; apex broadly tapering, or rarely almost rounded, the extreme tip apiculate with a short, thickened gland; margin slightly revolute; base tapering; scaly on both sides, at first, becoming glabrescent above, persistently, sub-densely scaly beneath. Scales angular or obtusely lobed in the narrow marginal zone; centre large, thick, impressed, becoming blackish. Mid-vein slightly impressed above in its proximal part, raised beneath; lateral veins sub-inconspicuous. Petiole 1–5mm, flattened, scaly. Bracts to 12 x 5mm, ovate-acuminate, apiculate subu­late, membranous, scaly at the tips outside, glabrous elsewhere, margin with fragile scales. Bracteoles c.8mm, filiform, glabrous. Flowers solitary. Pedicels c.10mm, slender, very densely reddish-brown-stellate-scaly, not hairy at all. Calyx c.2.5mm in diameter, oblique, disc-shaped, scaly outside, very shortly obtusely 5-lobed. Corolla 23–27mm, tubular, fleshy, white with a pink mouth; tube c.20 x 6–7 x 7–9mm, cylindrical, slightly curved, sub-densely sub-stellate-scaly outside, glabrous inside; lobes 6–7 x 6–7mm, broadly obovate or sub-circular, glabrous. Stamens reaching just below the mouth; filaments flattened and linear, glabrous; anthers 2.5 x 1mm, sub-obovate-oblong, cells often contracted at the base into a short apiculus. Disc prominent, shortly hairy at the upper margin, glabrous elsewhere. Ovary c.5 x 2mm, sub-cylindrical, densely, very shortly greyish hairy and sub-stellately scaly, gradually tapering distally; style slender, patently hairy in the proximal ½, glabrous distally, equalling the corolla in length; stigma club-shaped. Fruit (immature) 20 x 3mm, fusiform, densely shortly hairy and laxly scaly.

Distribution

Papua New Guinea, Mt Saruwaged and Rawlinson Range.

Altitude

Habitat

Epiphytic in mossy forest and forest margins

Nomenclatural History

Notes

References

Argent, G. (2006) Rhododendrons of subgenus Vireya. RHS:London. Page:220