Trachycarpus geminisectus

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Trachycarpus
(trahk-ee-KAHR-puhs)
geminisectus
(jehm-ihn-ih-SEHK-tuhs)
Trachycarpus geminisectus 6.jpg
Photo-palmking09.npage.de
Scientific Classification
Genus: Trachycarpus
(trahk-ee-KAHR-puhs)
Species:
geminisectus
(jehm-ihn-ih-SEHK-tuhs)
Synonyms
None set.
Native Continent
Asia
Asia.gif
Morphology
Habit: Solitary
Leaf type: Palmate
Culture
Survivability index
Common names
Eight Peaks Fan Palm

Habitat and Distribution

Vietnam, Ha Giang province (Quan Ba district) and Cao Bang province (Bao Lac district).
Vietnam. Photo by Dr. Leonid Averyanov, Royal Botanic Gardens, Kew/Palmweb.
In primary closed or secondary, low, wet, mossy mixed cloud forest on steep slopes and along remnant karst limestone ridges, at 1100–1600 m a.s.l.; cooccurring with conifers such as Cupressus, Taxus, Nagea, Pseudotsuga, broadleaf trees like Rhododendron, several Lauraceae and Rosaceae spp. Palms such as Plectocomia(?) and large Caryota have been observed close-by. Even though it has not been observed there yet, it seems very likely that T. geminisectus also occurs in similar habitats just across the border in China’s Guangxi province. (M. Gibbons. 2003)/Palmweb.

Description

Solitary, unarmed, dioecious fan palm; trunk erect, 1–2 m tall, densely clothed in persistent, fibrous leaf-sheaths, about 25 cm in diameter. Leaves 10–12, forming a spreading, very open crown, marcescent leaves forming a loose skirt around the trunk; leafsheath fibrous, very coarse, dark brown, persistent, dotted with a few pale brown scales, exposed part of sheath divided into stiff, wiry threads; petiole about 85 cm, slender, about 1.4 cm wide and 0.9 cm high near middle, very robust, stiff, flat above, triangular in cross section, with a broad yellow stripe below, orange towards the base, glabrescent, margins minutely toothed; hastula small, about 1.5 cm long, triangular, petiole slightly extending into the blade below to form a weak costa; leaf-blade palmate, 3/4 to 4/4 orbicular, about 85 cm long from hastula, about 130 cm wide, very leathery, dark, glossy green above, thick whitish waxy below, transverse veinlets barely visible, deeply and regularly divided for more than 3/4 its length into about 40 rigid, stiff, linear segments, joined for their entire length in groups of 2 or rarely 3, slightly tapering from 2/3 their length from the hastula towards the apex, arranged in one plane, producing a nearly flat leaf profile; central segments about 85 cm long, 4 cm wide at middle (i.e. about 8 cm for a typical double segment), with a very thick and prominent midrib beneath, lateral segments gradually more narrow and shorter, to about 50 x1.5 cm, apex of segments acute-notched, shortly bifid. Inflorescences few, interfoliar, branched to 3 orders. Male inflorescence short, about 50 cm long; peduncle short, oval in cross section; peduncular and inflorescence bracts keeled, base tubular, inflated distally, slightly tomentose, apex acuminate; rachis bracts similar to peduncular bracts; rachillae short, 3–6 cm long, thin; flowers densely arranged, subtended by minute bracteoles, globose, about 3 mm in diameter, yellow, fragrant; sepals ovate-triangular, 2 mm long, briefly connate at base; petals oblong orbicular, twice as long as sepals; stamens 6, exceeding the petals; filaments slightly ventricose; anthers saggitate, blunt; pistillodes about half the length of stamens. Female inflorescence long, robust, stiff, spreading; peduncle oval in crosssection, prophyll 2-keeled, long, tubular; peduncular and rachis bracts, keeled, long, tubular, apex acuminate; rachillae 7–13 cm long, fleshy, yellowish in fruit; flowers globose, 2–3 mm in diameter, yellow, fragrant, usually solitary, subtended by minute bracteoles, sepals 2 mm long, orbicular; petals oblong-orbicular, 2.5–3 mm long; staminodes very small; carpels ventricose with a short, conical style. Fruit shortly stalked, reniform, wider than long; epicarp thin, black, with a white bloom; mesocarp thin; seed reniform, wider than long; endocarp very thin; endosperm homogeneous. Germination remote-tubular, eophyll simple, narrow, plicate (M. Gibbons. 2003)/Palmweb. Editing by edric.

Culture

Sunny, well drained position. Cold tolerant. Slow growing when young.

Comments and Curiosities



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).

Gibbons, M.2003. Trachycarpus geminisectus, the Eight Peaks Fan Palm, a New Species from Vietnam. Palms 47(3) 143-148.


Many Special Thanks to Ed Vaile for his long hours of tireless editing and numerous contributions.

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