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星早熟禾檢視原始碼討論檢視歷史

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 星早熟禾

來自 植物智 的圖片

界:植物界

門:被子植物門 Angiospermae

綱:百合綱 Liliopsida

亞綱:鴨跖草亞綱 Commelinidae

目:莎草目 Cyperales

科:禾本科 Gramineae

亞科:早熟禾亞科

SubFam. Pooideae

屬:早熟禾屬 Poa

星早熟禾(xīng zǎo shú hé),拉丁文Poa xingkaiensis Y. X. Ma,是被子植物門禾本科早熟禾屬的一個物種,多年生植物,根狀莖; 嫩枝extravaginal。 稈直立,40-50厘米,1-2毫米直徑, 近平滑,節3或4。 葉鞘平滑,通常長比節間,約最上部的厘米,約3/4倍於葉片; 平的葉片,瘦,清楚,2-3毫米的5-20厘米×長向上,先端纖細船首端部; 葉舌2.5-3毫米,背面被微柔毛,先端截形。 圓錐花序開闊的,狹金字塔,產於海拔大約400米,分布於黑龍江[1]

形態特徵

多年生植物,根狀莖; 嫩枝extravaginal。 稈直立,40-50厘米,1-2毫米直徑, 近平滑,節3或4。 葉鞘平滑,通常長比節間,約最上部的厘米,約3/4倍於葉片;

平的葉片,瘦,清楚,2-3毫米的5-20厘米×長向上,先端纖細船首端部; 葉舌2.5-3毫米,背面被微柔毛,先端截形。 圓錐花序開闊的,狹金字塔,10-15 * 2-3 厘米,長約2厘米;

通常,上升的分枝每節,髮狀,粗糙,約長3厘米具適中密集在上部。 狹披針形的小穗,3.5-4毫米,小花2; vivipary無;

狹披針形的穎片,等長,倍於小穗,先端漸尖,從近基部那裡龍骨狀粗糙, 狹披針形的外稃,3-3.3毫米,龍骨狀短具長柔毛適合長度,邊緣脈適合1/4,在無毛的脈之間的地區; 網狀的胼胝體,毛短; 內稃。

FOC >> Vol.22 (2006) >> Poaceae >> Poa | eFloras.org Link 29.Poa xingkaiensis Y. X. Ma星早熟禾 xing zao shu he

Perennial, rhizomatous; shoots extravaginal. Culms erect, 40–50 cm, 1–2 mm in diam., nearly smooth, nodes 3 or 4. Leaf sheaths smooth, usually longer than internodes, uppermost ca. 11 cm, ca. 3/4 as long as blade; blades flat, thin, 5–20 cm × 2–3 mm, distinctly longer upward along culm, apex slender prow-tipped; ligules 2.5–3 mm, abaxially puberulent, apex truncate.

Panicle open, narrowly pyramidal, 10–15 × 2–3 cm, longest internodes ca. 2 cm; branches ascending, usually 5 per node, capillary, scabrid, longest ca. 3 cm with 6–9 moderately crowded spikelets in distal 4/5.

Spikelets narrowly lanceolate, 3.5–4 mm, florets 2; vivipary absent; glumes narrowly lanceolate, equal, as long as spikelet, apex acuminate, keels scabrid from near base, lower glume 3.8–4 mm, 3-veined, upper glume 4.1–4.5 mm, 3-veined;

lemmas narrowly lanceolate, 3–3.3 mm, keel shortly villous for 1/2 of length, marginal veins for 1/4, area between veins glabrous; callus webbed, hairs short; palea "hyaline," distinctly shorter than lemma. Anthers 0.7–0.8 mm (doubtfully mature, presumably over 1.2 mm at maturity). Fl. and fr. Aug.

產地生境

  • About 400 m. Heilongjiang.

海拔大約400米,黑龍江

辨析

Except for its rhizomatous habit, this species seems different from other members of Poa subg. Poa and is only tentatively placed here. It is known only from the type, which we have not seen, but the description and illustration suggest the plant may be immature.

The illustration looks somewhat like immature specimens of P. compressa, with a Koeleria-like inflorescence at anthesis. We wonder if it could be a species of P. subg. Stenopoa, perhaps P. sphondylodes or P. versicolor subsp. ochotensis with an odd habit.

除了它的根狀莖的體型,本種好像不同於Poa subg的其他成員。 Poa和在這裡只被暫時安置。 知道只從模式標本那裡,我們有未見哪個,描述和插圖建議未發育完全的植株可能是。

插圖看起來有點象頁compressa,具一象Koeleria一樣的花序在花期的未發育完全標本。 我們想知道是否這可能是一種subg頁。 Stenopoa,或許頁sphondylodes或頁變色的亞種 ochotensis具一古怪的體型。

參考文獻

  1. 星早熟禾,植物智, 2017-08-19