Comments
provided by eFloras
This species is closely related to Themedu triandra Forssk, a widely distributed species which grows in the warm and tropical regions of the world.
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Comments
provided by eFloras
This is a highly polymorphic, predominantly apomictic species with a wide range of chromosome numbers.
The name Themeda arguens (Linnaeus) Hackel has been misapplied to this species in Yunnan. True T. arguens is not yet known from China. It occurs from Thailand and Vietnam to Australia, and can be distinguished by its reddish culms, very large, spathate fascicles with awns 7–9 cm, and longer callus 3–4 mm. It also differs from T. triandra by its glabrous leaf sheaths, blunter leaf blades, and homogamous spikelets consisting only of the lower glume.
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Description
provided by eFloras
Themeda triandra subsp. japonica (Willd.) Koyama, Grass. Jap. Neighb. Reg. 452. 1987.
Culm slender, about 1.5 mm in diameter. Blade linear, less than 10 cm long by 3 mm wide, basal margins with glandular hairs; ligule chartaceous, 1-2 mm long, truncate, minutely ciliate on upper part and back. Spikelets paired, dimorphic, with 2 pairs of empty spikelets at base, forming a compound false panicle, interrupted by involucres; each empty spikelet covered with long glandular hairs on lower glume. The upper pedicellate, 1 /2 the width of the lower. Lower spikelet sessile, pubescent, about 5 mm long. Glumes coriaceous, as long as the spikelet: the lower linear-lanceolate, hirsute on back; the upper oblong, 2-keeled, margins inrolled and glabrous; lower lemma membranous, lanceolate, acute, about 3 mm long; upper lemma minute, membranous, about 2.5 mm long, apex prolonged into a long and hispid awn about 3.5 mm long. Caryopsis about 3 mm long, oblong; embryo linear, 1/2 the length of the caryopsis.
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Description
provided by eFloras
Perennial from a knotty rootstock. Culms tussocky, yellowish, usually farinose near nodes, 0.5–1.5 m tall. Leaf sheaths usually hispid with tubercle-based hairs; leaf blades 10–50 × 0.4–0.8 cm, glabrous or pilose, finely acuminate; ligule 1–2 mm, truncate, ciliate. Compound panicle lax, open, with spaced, often nodding spathate fascicles; spathes and spatheoles narrowly lanceolate, glabrous or thinly to densely tuberculate-hispid, innermost 2–3.5 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, staminate, both glumes present, 7–14 mm, oblong-lanceolate with lateral scarious wings, glabrous or hispid with tubercle-based hairs. Sessile spikelet 5–7 mm; callus 1.5–3 mm, pungent, brown bearded; lower glume dorsally rounded, dark brown, glossy, hispidulous in upper 1/3, smooth below; awn 3.7–7 cm. Pedicelled spikelet 7–12 mm, male or barren. Fl. and fr. Jun–Dec. 2n = 20, 40, 50, 60, 70, 80.
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Distribution
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Distributed in China, Korea and Japan.
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Distribution
provided by eFloras
All warm and tropical regions.
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Distribution
provided by eFloras
Anhui, Fujian, Guizhou, Hainan, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bhutan, India, Indonesia, Japan, Korea, Malaysia, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam; Africa, SW Asia, Australia].
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Elevation Range
provided by eFloras
2900-4100 m
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Habitat
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Dry mountain slopes, roadsides, forest margins; 100–3000 m.
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Synonym
provided by eFloras
Anthistiria japonica Willdenow; Themeda barbinodis B. S. Sun & S. Wang; T. japonica (Willdenow) Tanaka; T. tri-andra var. japonica (Willdenow) Makino.
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Rooigras
(
Afrikaans
)
provided by wikipedia AF
Rooigras (Themeda triandra) is een van die belangrikste grasspesies van Suid-Afrika. Dit is inheems en kom in alle provinsies voor, maar dit word ook wydverspreid buite die land aangetref.[1]
Dit word in soetveldstreke as 'n soetgras beskou, maar as suurgras in suurveldstreke. Hoe hoër die reënval van 'n streek hoe suurder die veld gewoonlik is. Rooigras is 'n meerjarige spesie wat dikwels 'n klimaksgras is. Dit wil sê dat dit sal oorheers in 'n volwasse gemeenskap wat vir 'n hele aantal jare gerus word ontwikkel.[2]
Dit word 30 cm tot 150 cm hoog. Die jong gras is groen of blougroen, maar dit kry pienk, rooi of pers kleure as dit ouer word. In Oktober tot Julie kry dit hangende blompakkies wat drie puntige uitsteeksels het. Die aanwesigheid van rooigras dui op 'n gesonde toestand van die veld.[3]
Rooigras is 'n belankrike deel van die oorspronklike laagrenosterveld.[4]
Verwysings
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Rooigras: Brief Summary
(
Afrikaans
)
provided by wikipedia AF
Rooigras (Themeda triandra) is een van die belangrikste grasspesies van Suid-Afrika. Dit is inheems en kom in alle provinsies voor, maar dit word ook wydverspreid buite die land aangetref.
Dit word in soetveldstreke as 'n soetgras beskou, maar as suurgras in suurveldstreke. Hoe hoër die reënval van 'n streek hoe suurder die veld gewoonlik is. Rooigras is 'n meerjarige spesie wat dikwels 'n klimaksgras is. Dit wil sê dat dit sal oorheers in 'n volwasse gemeenskap wat vir 'n hele aantal jare gerus word ontwikkel.
Dit word 30 cm tot 150 cm hoog. Die jong gras is groen of blougroen, maar dit kry pienk, rooi of pers kleure as dit ouer word. In Oktober tot Julie kry dit hangende blompakkies wat drie puntige uitsteeksels het. Die aanwesigheid van rooigras dui op 'n gesonde toestand van die veld.
Rooigras is 'n belankrike deel van die oorspronklike laagrenosterveld.
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- Wikipedia skrywers en redakteurs