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無莖菅檢視原始碼討論檢視歷史

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 無莖菅

來自 植物智 的圖片

中文名:無莖菅

學 名:Themeda

helferi Munro ex Hackel

界:植物界

門:被子植物門

綱:單子葉植物綱

目:禾本目

科:禾本科

族:高粱族

屬:菅屬

種:無莖菅

無莖菅(wú jīng jiān),學名: Themeda helferi Munro ex Hackel,異名:Themeda acaulis Themeda ciliata subsp. helferi Themeda quadrivalvis var. helferi  ,屬禾本科,一年生草本 纖細的稈,單生或在小鬆散多孔軟岩,可達30厘米高內。 葉鞘短於節間,無毛; 葉片平或摺疊, 5-10 * 0.2-0.4 厘米,一些基於小瘤的剛毛在下部邊緣,或無毛,銳尖; 葉舌約1毫米,削去,具短緣毛。 [1]

形態特徵

一年生草本 纖細的稈,單生或在小鬆散多孔軟岩,可達30厘米高內。 葉鞘短於節間,無毛; 葉片平或摺疊, 5-10 * 0.2-0.4 厘米,一些基於小瘤的剛毛在下部邊緣,或無毛,銳尖;

葉舌約1毫米,削去,具短緣毛。 Spathate束簇生於全部葉腋從基部向先端的稈,束簇聚集關於纖細有節分枝;

佛焰苞和spatheoles狹披針形尾狀, Homogamous的小穗全部無柄,在相同的水平出現, 無梗小穗約4毫米; 胼胝體0.5-1毫米,鈍,棕色具髯毛;

全部的背的更低的穎片稍扁平,短柔毛; 芒3.5-4.5 厘米Pedicelled小穗5-6毫米,無意義。

Themeda acaulis B. S. Sun & S. Wang; T. ciliata (Linnaeus f.) Hackel subsp. helferi (Munro ex Hackel) A. Camus; T. quadrivalvis (Linnaeus) Kuntze var. helferi (Munro ex Hackel) Bor.Annual. Culms very slender, solitary or in small loose tufts, up to 30 cm tall.

Leaf sheaths shorter than internodes, glabrous; leaf blades flat or folded, 5–10 × 0.2–0.4 cm, a few tubercle-based bristles on lower margins, otherwise glabrous, acute; ligule ca. 1 mm, truncate, ciliolate.

Spathate fascicles arising from all leaf axils from base to apex of culm, fascicles congregated on slender 1–3-noded branches; spathes and spatheoles narrowly lanceolate-caudate, glabrous, innermost ca. 2 cm.

Raceme composed of a triad of 1 sessile and 2 pedicelled spikelets above the involucre of 2 homogamous pairs. Homogamous spikelets all sessile, arising at same level, male with both glumes present, 4–5 mm, narrowly lanceolate, stiffly setose in upper half with ca. 3 mm, tubercle-based bristles, upper keels scabrid.

Sessile spikelet ca. 4 mm; callus 0.5–1 mm, obtuse, brown bearded; lower glume dorsally slightly flattened, pubescent throughout; awn 3.5–4.5 cm. Pedicelled spikelet 5–6 mm, barren.

產地生境

Stream banks; ca. 600 m. Yunnan (Longling, Zhenkang) [Myanmar (Tenasserim)].

河邊 約600米雲南(Longling,Zhenkang) [緬甸(Tenasserim) ].

辨析

This slender, annual species is remarkable in that fascicles of racemes are borne all the way down to the base of the plant, so that the whole culm in effect forms the compound inflorescence. It appears to be rare and fairly localized in its distribution.

這纖細,一年生草本種驚人總狀花序的束簇着生一直到植株的基部, 它看起來在它的分布里稀有和相當局限。

標本鑑定信息

學名 Themeda helferi Munro ex Hackel 中文名 無莖菅 鑑定人 譚策銘 鑑定時間 19990114

採集信息

採集人 譚策銘 採集號 9611007 採集時間 19961106 採集地 中國 江西省

海拔 170 生境 低丘馬尾松林下 習性 草本 物候期 有花無果

參考來源

  1. 無莖菅, 植物智, 2020-01-18