Cycas taitungensis Image
Cycas taitungensis
Copyright © Phil Markey

Cycas taitungensis

Family: Cycadae    ソテツ

共通名: Emperor Sago

科学的なシノニム:
Cycas taiwaniana

コモンネームシノニム:
Prince sago

耐寒ゾーン: 9b     英国と米国ゾーンの天気画像を見る

Cycas taitungensis 知識

識別:
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.

一般的な情報:
Although not described until 1994, this species was widely known previously under the misapplied name C. taiwaniana. Very closely related to C. revoluta, this species is readily distinguished by the longer, flatter leaves with longer, broader and flatter leaflets. Female cones also tend to be more tightly imbricate and cabbage-like, and seeds are darker in colour. Cycas taitungensis is now under serious threat from the invasive Cycad Aulacaspis Scale, which first reached the wild populations in 2004.

分布:

へのネイティブ, Taiwan

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

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

観測
マップは、完全な、自然分布を表していない可能性があります。 (マーカーは、観測データを示している)。

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