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Taiwan Gramineae | Family List | Poaceae

Rhynchelytrum Nees

紅毛草屬

Rhynchelytrum repens
drawing

Credit: CC Hsu

Annuals or perennials, culms hollow. Leaf ligule a fringe of hairs; blade linear or setaceous. Inflorescence an open or contracted panicle branching from all sides. Spikelets articulated with pedicels, often conspicuous by white, cream-coloured, lilac, pink or purple hairs, ovate, laterally compessed, 2- flowered; pedicels widened at apex; rachilla articulated at base of upper lemma, sometimes internode between glumes distinct; lower glume at most as long as spikelet, usually smaller, rarely an obsolete rim; upper glume at most as long as spikelets, herbaceous, 5-veined, usually convex in lower half and attenuate upwards into beak-like apex, awnless or awned between lobes, awn straight, thread-like; lower lemma like upper glume or narrower and less convex; lower palea as long, narrower with 2 hairy or scaberulous keels; upper lemma smaller, glabous and glossy, membranaceous or herbaceous, muticous; upper palea equally long, hyaline, glabrous, 2-veined; lodicules 2, small; stamens 3, anthers linear; ovary glabrous, styles 2, free, stigma plumose, laterally exserted. Caryopsis tightly enclosed between upper palea and upper lemma, free, oblong, hilum punctiform, basal, embryo 1/2 as long as caryopsis.

About 14 species in tropical Africa. One species naturalized in Taiwan.

midrib 中肋: (sm)small:with one vascular bundle

leaf surface 表面: (sha)upper surface with shallow notch
between the veins

sclerenchyma 厚壁組織: (boscl)(bostr)on both sides of veins as
strand or girder

chlorenchyma 葉綠組織: (radia)cells radiate and lesser than
bundle sheath cell in width

bundle sheath 維管束鞘: (dko)two bundle sheaths the outer one
with conspicuous chloroplast

buliform cells well developed 泡狀細胞發達: mainly appear in adaxial side

no small vein under buliform cells泡狀細胞下無小脈: (bcfan)bulliform cell with colorless cells
extend beneath it

chlorenchyma cell number between two adjacent veins: 2

chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (out)large amount and in centrifugal site

mestome sheath 內束鞘細胞: (Xyms+)metaxylem pole adjacent with
mestome sheath

distance between two adjancent vein 脈間距: 120 micrometer

length/weidth ratio of bundle sheath in LS 束鞘細胞縱面長寬比: 1

chlorenchyma cell shape in LS 葉綠細胞縱面形狀: lobed

Lower Taxon


 

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