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Rhododendron hirsutum; Hairy Alpenrose   

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Rhododendron hirsutum
Rhododendron hirsutum
Hairy Alpenrose
Photographer: Dr. Amadej Trnkoczy

ID: 0000 0000 1214 1624 (2014-12-16)

Copyright © 2014 Dr. Amadej Trnkoczy

  • date of photo  Aug 1, 2014
  • latitude 46.44301   longitude 13.64452     View on Google Maps.
  • location   Mt. Mangart region, Mangart's flats, below Čez jezik pass, 2.055 m (6.742 feet) and south of Mt. Travnik, 2.200 m (7.218 feet), East Julian Alps (Posočje, Slovenia)
  • notes   Slo.: dlakavi sleč - Habitat: stony alpine grassland, among outcropped rocks, southeast moderately inclined mountain slope, open place, full sun, relatively dry and nutrient poor skeletal calcareous ground with outcropped rocks, some siliceous acid rock intermeshed; exposed to direct precipitations, average precipitations ~ 3.000 mm/year, average temperature about 0 - 2 deg C, elevation 1.980 m, (6.500), alpine phytogeographical region. - Substratum: soil among rocks. - Comment: Genus Rhododendron is huge having more than 600 species known all over the world. However, vast majority of them are not growing in Europe. The genus is widely exploited in market gardening. In Slovenia one can admire three members growing in the wild: Rhododendron hirsutum, Rhododendron ferrugineum and Rhododendron luteum. The first one loves calcareous ground and hence it is most common, the second one explicitly loves acid ground and is hence much rarer in predominantly calcareous Slovenia, and for the last one some doubts exists whether it is not only an old escape from gardens. However, most pros believes it is an autochthone plant in my country. It is very rare and I haven't seen it yet in the wild. Distinguishing among all three species is easy. Rhododendron luteum flowers yellow, while other two are reddish pink. Rhododendron hirsutum has distinct, up to 1mm long, fringe of hairs on leaf margin (has ciliate leaves). Rhododendron ferrugineum has quite similar flowers to Rhododendron hirsutum, but its leaves have no fringes and they are rusty brown underside. - Rhododendron hirsutum is a subendemic plant limited mostly to east Alps. It is a plant, which does not attract with its exclusivity or rarity, actually it is a very common plant in south-east Alps, but with its rich flowering, beauty and abundance. In some places mountain slopes of Julian Alps get literally red of its flowers in august. It evokes my admiration again and again so I can't stop photographing it in an attempt to share my feelings with others. - Ref.: (1) K. Lauber and G. Wagner, Flora Helvetica, 5. Auflage, Haupt (2012), p 706. (2) M.A. Fischer, W. Adler, K. Oswald, Exkursionsflora Österreich Liechtenstein, Südtirol, LO Landesmuseen, Linz, Austria (2005), p 662. (3) A. Martinči et all., Mala Flora Slovenije, Tehnična Založba Slovenije (2007) (in Slovene), p 484. (4) D. Aeschimann, K. Lauber, D.M. Moser, J.P. Theurillat, Flora Alpina, Vol. 1., Haupt (2004), p 620.
  • camera   Canon G11, 6.1-30mm/f2.8-4.5
  • contributor's ID #  Bot_820/2014_DSC6407
  • photo category: Plant - annual/perennial

  • common names   Hairy Alpenrose, Hairy Rhododendron (photographer)
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    Using this photo   The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2014 Dr. Amadej Trnkoczy. For other uses, or if you have questions, contact Dr. Amadej Trnkoczy amadej.trnkoczy[AT] (Replace the [AT] with the @ symbol before sending an email.)


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