Cycas taitungensis Image
Cycas taitungensis
Copyright © Phil Markey

Cycas taitungensis

Family: Cycadae    Cycadale

Nom commun: Emperor Sago

Synonyme scientifique:
Cycas taiwaniana

Nom commun:
Prince sago

zone de rusticité: 9b     Voir les cartes des zones de rusticité pour le Royaume-Uni et les États-Unis

Identification:
Stems arborescent, to 6 m tall, 25-30 cm diam. Leaves deep green, glabrous, 100-180 cm long, slightly keeled (opposing leaflets inserted at 120-170 on rachis), with 150-170 leaflets, with orange tomentum shedding as leaf expands; rachis usually terminated by a spine. Petiole 15-20 cm long (15-20% of total leaf), petiole glabrous, spinescent for 50-90% of length. Basal leaflets gradually reducing to spines, 30 mm long. Median leaflets simple, strongly discolourous, 120-170 mm long, 6-8 mm wide, inserted at 45-60 to rachis, decurrent for 2.5-4.5 mm, narrowed to 2-2.5 mm at base (to 30-45% of maximum width), 4.5-6 mm apart on rachis; median leaflets section slightly keeled; margins recurved; apex acute, spinescent; midrib flat above, raised below. Cataphylls linear, pungent, densely floccose, persistent. Pollen cones fusiform, yellow, 35-50 cm long, 8.5-10 cm diam.; microsporophyll lamina waxy, not dorsiventrally thickened, 35-40 mm long, 11.5-15 mm wide, fertile zone 25-30 mm long, sterile apex 4.5-10 mm long, apical spine absent, apex deflexed, 6 mm long. Megasporophylls 21-26 cm long, brown-tomentose; ovules 2-6, pubescent; lamina orbicular, 100-130 mm long, 80-100 mm wide, deeply pectinate, with 28-36 soft lateral spines 35-45 mm long, 1.5-3 mm wide, apical spine not distinct from lateral spines. Seeds oblong, 40-45 mm long, 25-30 mm wide; sarcotesta red, slightly pruinose, 1.5-3 mm thick; fibrous layer absent; sclerotesta longitudinally grooved. Spongy endocarp absent.

Informations générales:
Observation

Distribution:

Originaire de, Taiwan

Known only from 2 locations on steep, south facing slopes between 300 m alt., and 950 m alt.

Localisation: Taiwan (22.866816°N, 120.999214°E)

Observations
La carte peut ne pas représenter précisément la répartition naturelle. (Les marqueurs indiquent les données observées).


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