Hydriastele manusii
Hydriastele (high-dree-Ah-STEL-eh) manusii (mah-NOO-see) | |||||||
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Hydriastele manusii. A. Habit. B. Juvenile habit. All from Manus Island. All photos: Axel Dalberg Poulsen. PETER PETOE, CHARLIE D. HEATUBUN & WILLIAM J. BAKER Phytotaxa 370 (1) © 2018 Magnolia Press. | |||||||
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Contents
Habitat and Distribution
Distribution:—Manus Island in the Bismarck Archipelago.Habitat:—Premontane rainforest on steep slopes, 600–740 m. PETER PETOE, CHARLIE D. HEATUBUN & WILLIAM J. BAKER Phytotaxa 370 (1) © 2018 Magnolia Press.
Description
Solitary, moderately robust palm to 20 m tall, bearing 9–13 leaves in crown. Stem 10–15 cm in diam.; internode not seen. Leaf about 1.5–2 m long including petiole; sheath about 100 cm long, with white bloom, crownshaft about 150 × 15 cm; petiole about 10 cm long, channelled adaxially; rachis arcuate; leaflets about 40 per side, arranged regularly, ascending and ± drooping at their tips, linear, truncately praemorse apically, lacking ramenta; basal leaflets multi-fold; middle leaflets 60–66 × 2–3 cm, single-fold; terminal leaflets comprising 2–4 folds. Inflorescence 60–80 cm long including 20–22 cm peduncle, branched to 2 orders, protandrous; rachillae 12–15; triads on average 3–4 mm apart, opposite and decussate; 1–5 inflorescences present. Staminate flower 6–7 × 3–4 mm at anthesis (when dry); stamens 6. Pistillate flower 3.5–4 × 2.5–3 mm in bud (when dry), with free sepals and free petals with conspicuous, triangular and valvate tips. Fruit about 12 × 4 mm (when dry), elongate and curved (when dry), red, with a rather inconspicuous sclerotic zone encircling apical stigmatic remains (up to about 1.5 mm in diam. when dry). Seed about 8.3 × 3.5 mm (when dry), curved; endosperm homogeneous. PETER PETOE, CHARLIE D. HEATUBUN & WILLIAM J. BAKER Phytotaxa 370 (1) © 2018 Magnolia Press.
Culture
Cold Hardiness Zone: 10b
Comments and Curiosities
Notes:—Hydriastele manusii is a moderately robust canopy palm distinguished by its relatively short (1.5–2 m long), arching leaves with equally short (ca. 10 cm long) petioles. The species is further distinguished by its inflorescences with 20 cm long peduncles and relatively few (12–15) rachillae. Confusion with other species is unlikely. PETER PETOE, CHARLIE D. HEATUBUN & WILLIAM J. BAKER Phytotaxa 370 (1) © 2018 Magnolia Press.
External Links
References
Phonetic spelling of Latin names by edric.
Special thanks to Geoff Stein, (Palmbob) for his hundreds of photos.
Special thanks to Palmweb.org, Dr. John Dransfield, Dr. Bill Baker & team, for their volumes of information and photos.
Glossary of Palm Terms; Based on the glossary in Dransfield, J., N.W. Uhl, C.B. Asmussen-Lange, W.J. Baker, M.M. Harley & C.E. Lewis. 2008. Genera Palmarum - Evolution and Classification of the Palms. Royal Botanic Gardens, Kew. All images copyright of the artists and photographers (see images for credits).
PETER PETOE, CHARLIE D. HEATUBUN & WILLIAM J. BAKER Phytotaxa 370 (1) © 2018 Magnolia Press.
Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.