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矮赤箭莎

来自 植物智 的图片

界；植物界 纲；单子叶植物纲 目；莎草目 科；莎草科 族；刺子莞族 种；矮赤箭莎

矮赤箭莎(ǎi chì jiàn suō)，学名 Schoenus apogon Roemer & Schultes，疏丛生草本，具粗而长的须根。秆直立，圆柱状，通常高85厘米，直径1.2-4毫米，无毛。产于台湾台中市；生长于沼泽地中，海拔约330米。

形态特征

疏丛生草本，具粗而长的须根。

秆直立，圆柱状，通常高85厘米，直径1.2-4毫米，无毛，有槽，基部被有枯萎的叶鞘，叶鞘紫红色或黑血红色，后来黑色。

叶基生和秆生，鞘长3-4厘米，基部宽5-10毫米，具多数肋条，无叶舌；叶片线形，宽1-5毫米，边缘粗糙，具7条脉，脉在背面隆起；秆生叶1-3片，远离，较短，具鞘；鞘红棕色，口偏斜，边缘膜质，由下而上渐短，下部的长约3.5厘米，上部的1.5-2.2厘米。

苞片叶状，由下而上渐短小，具鞘，鞘棕色或棕红色；狭圆锥花序松散，具6-10个分枝，分枝花序通常1-3个从同一苞片的鞘中生出；小穗直立，扁，多少具小穗柄，披针形，长7-8毫米，棕色，具6-7片鳞片；鳞片二列，卵状披针形至卵形，边缘几白色，背面具黄绿色龙骨状突起，顶端细尖或具短尖或微凹，下部2-3片鳞片内无花，无花鳞片长为小穗的1/3;有花鳞片背面的龙骨状突起粗糙；下位刚毛3条，纤细，具短柔毛，最上面的花无下位刚毛；雄蕊3，花丝带状，花药栗棕色，线形，早落，药隔突出于花药顶端；花柱长几与鳞片相等，柱头3，被短柔毛。

小坚果倒卵形，棕色，长1-1 1/3毫米，三稜形，无喙，表面有明显的网纹，顶端有白色糙伏毛。花果期5-7月。

FOC >> Vol.23 (2010) >> Cyperaceae >> Schoenus 3.Schoenus apogon Roemer & Schultes Syst. Veg. 2: 77. 1817. 矮赤箭莎 ai chi jian suo

Annuals or short-lived perennials, slender. Roots fibrous. Culms tufted, 20-40 cm tall, 0.5-1 mm thick, mostly 2-nodose, smooth. Leaves basal and cauline.

Cauline leaves 2, shorter than culm; sheath reddish purple, 1-2 cm; leaf blade capillary, ca. 0.5 mm wide. Involucral bracts surpassing inflorescence; sheath reddish purple, 0.5-1 cm.

Inflorescences consisting of 2-5 distant corymbiform partial panicles, each bearing several sessile and shortly pedunculate spikelets; partial panicles 0.8-1.5 cm and as broad.

Spikelets reddish brown, narrowly ovoid, 4-6 mm, flattened, 1- or 2(or 3)-flowered. Glumes sanguineous with pale margin, lanceolate to ovate-lanceolate, 3-4 mm, papery, apex obtuse; basal 2 or 3 glumes empty, rather short.

Perianth bristles 6, ca. 2 mm, antrorsely scabrous. Stamens 3. Style ca. 1.5 mm, base glabrous; stigmas 3, as long as style. Nutlet whitish, globose-obovoid, ca. 1 mm, obtusely 3-sided, sides convex, shiny, and minutely reticulate. Fl. and fr. May.

产地生境

Moist coastal grasslands; near sea level. W Taiwan (Taizhong) [Japan, Vietnam; Australia].

辨析

This is a very rare species in Taiwan with only one collection at the TAI herbarium, collected in May 1906 and obtained from the MAK herbarium.This is a very rare species in Taiwan with only one collection at the TAI herbarium, collected in May 1906 and obtained from the MAK herbarium.

标本鉴定信息

学名 Schoenus apogon Roem. et Schult. 中文名 矮赤箭莎 鉴定人 鉴定时间

采集信息

采集人 D.J.E.Whibley 采集号 7491 采集时间 19801016 采集地 澳大利亚 海拔 0 生境 习性 物候期 有花无果