Ischaemum rugosum var. segetum

田間鴨嘴草

Ischaemum rugosum Salisb. var. segetum (Trin.) Hack.

名彙資訊

特徵描述

典藏標本

數位照片

分布位置

相關資訊

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Hack., Monographiae Phanerogamarum 6: 208. 1889. (Monogr. Phan.)

Ohwi, Acta phytotaxonomica et geobotanica eng 11: 175. 1942. (Acta Phytotax. Geobot., 植物分類,地理)

Ischaemum tashiroi Honda

Honda, The Botanical magazine, Tokyo 37: 365. 1923. (Bot. Mag. Tokyo, 植物學雜誌)

herb

Culms erect, to 50 cm tall, 3-7-noded, nodes bearded.
Blade linear-lanceolate, 4-20 cm long, margins scabrous, usually soft hairy; ligule rounded, membranaceous, 2-4 mm long; sheath loose, margin ciliate, usually shorter than internode.
Racemes paired, 3-8 cm long; rachis and pedicel swollen, ca. 2/3 as long as spikelet, ciliate. Spikelets paired, one pedicellate and other sessile. Sessile spikelet ca. 4 mm long; callus bearded; lower glume coriaceous except at apex, with 4-5 transversely rugose lines on dorsal part, margins keeled and winged, wings minutely ciliate; upper glume boat shaped, 1-keeled; lower lemma slightly shorter than spikelet, upper margin shortly ciliate; upper lemma deeply 2-cleft, awn 15-20 mm long, protruding from sinus; anthers ca. 2 mm long. Pedicellate spikelet awnless, sometimes reduced to only glumes.
Variable; <i>Ischaemum akoense</i> may only be an extreme form of this species.